;*************************************************************************
; Testcode for fooling debuggers AND disassemblers
;
;       16.05.94        ROSE, Ralph Roth, Finkenweg 24, D 78658 Zimmern
;
;
; Needs MASM 6.00++ to assemble!
;
;*************************************************************************

.model  tiny
.code
org     100h
.startup

        mov     ah, 9                   ; print
        mov     dx, offset helloworld   ; msg
        int     21h                     ; via DOS

;       int     3                       ; kills debug (and DOS 6.2)

        pushf
        pop     ax
        and     ax,0feffh               ; reset trap flag
        push    ax
        popf

;-----kills td, debug, sourcer and disasm

        mov     cx,09EBh
        mov     ax,0FE05h               ;-\
        jmp     $-2                     ;  >--this should look familiar to you
        add     ah,03Bh                 ;-/
        jmp     $-10                    ; TD runs into a hlt instruction!

        mov     cx,09EBh
        mov     ax,0FE05h               ;-\
        jmp     $-2                     ;  >--this should look familiar to you
        add     ah,03Bh                 ;-/
        jmp     $-10                    ; TD runs into a hlt instruction!

                                        ; rest of code

bypass_this:

        pushf
        pop     ax
        and     ax,0100h                ; code debugged?
        jz      ear_lobber

        mov     ah, 9                   ; print
        mov     dx, offset sukk_debug   ; msg
        int     21h                     ; via DOS
        cli
        hlt                             ; quit

ear_lobber:                             ; play with the prefetch...
        mov     ah, 9                   ; print text
        mov     di, offset ear_lobe-2
        mov     word ptr cs:[di], offset sukk_debug
        mov     dx, offset mytext
ear_lobe:
        int     21h

        mov     ax, 4Ch
        mov     dx, offset mytext
        cli
        mov     sp, offset fin_rot      ;; playing with the stack
        push    ax
        mov     ah, 9
fin_rot:int 21h
        pop     ax
        sti
        int     21h                     ;; no print the msg
        .exit   0


helloworld byte 'Testprogram to determine (and to fool) the use of a debugger'
        byte    13, 10, 13, 10, '$'
mytext  byte    'No Debugger detected!', 13, 10, '$'

sukk_debug byte 0Ah, 0Dh, 09h
        byte    "FUCK: Don't use a debugger you lamer!", 07h, 0Ah, 0Dh, '$'

.data
end