mirror of
https://github.com/vxunderground/MalwareSourceCode.git
synced 2024-12-25 04:45:27 +00:00
87 lines
2.7 KiB
NASM
87 lines
2.7 KiB
NASM
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cseg segment para public 'CODE'
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assume cs:cseg,ds:cseg,es:cseg,ss:cseg
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org 100h
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begin: mov dx,offset virus_get ; Set Int F2h Handler
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mov ax,25F2h
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int 21H
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mov dx,offset signon ; Tell Them We're Here
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mov ah,9
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int 21h
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mov dx,((offset pgm_len+15)/16)+10h ; Reserve DX Paragraphs Mem
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mov ax,3100h ; TSR Code 0
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int 21h
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virus_get proc near
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sti
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push ax ; Save Registers
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push bx
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push cx
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push dx
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push di
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push si
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push bp
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push ds
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push es
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cmp dx, 'As' ; Virus?
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jne okay ; Nope
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mov ax,cs
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mov ds,ax
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mov dx,offset warning ; Warn User
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mov ah,9
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int 21h
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check: mov ah,1 ; Read Keyboard
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int 21h
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cmp al,'C' ; User Wants To Continue
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je cont
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cmp al,'c'
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je cont
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cmp al,'Q' ; User Wants To Quit
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je quit
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cmp al,'q'
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je quit
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mov dx,offset bad ; Incorrect Key
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mov ah,9
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int 21h
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jmp check
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quit: mov ah,9 ; 'Contact Havoc The ...'
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mov dx,offset ending
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int 21h
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mov ax,4cffh ; Exit Code 255
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int 21h
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cont: mov dx,offset crlf ; Send CR/LF
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mov ah,9
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int 21h
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okay: pop es ; Restore Registers
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pop ds
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pop bp
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pop si
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pop di
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pop dx
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pop cx
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pop bx
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pop ax
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iret ; Interrupt Return
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virus_get endp
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signon db 10,13,'Gunther Virus Detection Handler Installed.'
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db 10,13,'Created by Havoc The Chaos'
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db 10,13,'Copywrite (c) 1992, 1993 by John Burnette'
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db 10,13,'All Rights Reserved.',10,13,'$'
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warning db 7,7,7,10,13,'Warning, Interrupt F2h Detected: Gunther Virus is active!'
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db 10,13,'Continue or Quit (C/Q) ? $'
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ending db 10,10,13,'Contact Havoc The Chaos for a cure by sending him the virus!',7,'$'
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bad db 7,7,8,' ',8,'$'
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crlf db 10,13,'$'
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pgm_len equ $-begin
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cseg ends
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end begin
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