mirror of
https://github.com/vxunderground/MalwareSourceCode.git
synced 2024-12-21 02:46:10 +00:00
101 lines
3.6 KiB
NASM
101 lines
3.6 KiB
NASM
|
;----------------------------------------------------------------------------
|
|||
|
|
; TPE-GEN - This program generates 50 TPE encrypted test files
|
|||
|
|
;
|
|||
|
|
; This source can be compiled with MASM 5.0 or TASM 2.01
|
|||
|
|
; (and perhaps others too, but this is not tested.)
|
|||
|
|
;----------------------------------------------------------------------------
|
|||
|
|
|
|||
|
|
.model tiny
|
|||
|
|
.RADIX 16
|
|||
|
|
|
|||
|
|
.code
|
|||
|
|
|
|||
|
|
extrn crypt:near ;external routines in engine
|
|||
|
|
extrn rnd_get:near
|
|||
|
|
extrn rnd_init:near
|
|||
|
|
|
|||
|
|
|
|||
|
|
org 0100
|
|||
|
|
|
|||
|
|
begin: call rnd_init ;init. random number generator
|
|||
|
|
|
|||
|
|
mov dx,offset starttxt ;print message
|
|||
|
|
mov ah,09
|
|||
|
|
int 21
|
|||
|
|
|
|||
|
|
mov cx,50d ;repeat 50 times
|
|||
|
|
lop: push cx
|
|||
|
|
|
|||
|
|
mov ah,3C ;create a new file
|
|||
|
|
mov dx,offset filename
|
|||
|
|
mov cx,0020
|
|||
|
|
int 21
|
|||
|
|
xchg ax,bx
|
|||
|
|
|
|||
|
|
push ds
|
|||
|
|
push es
|
|||
|
|
push bx
|
|||
|
|
|
|||
|
|
mov ax,cs ;input parameters for engine
|
|||
|
|
mov ds,ax
|
|||
|
|
add ax,0400
|
|||
|
|
mov es,ax ;ES = DS + 400h
|
|||
|
|
xor si,si ;code will be right after decr.
|
|||
|
|
mov dx,offset hello ;this will be encrtypted
|
|||
|
|
mov cx,100d ;length of code to encrypt
|
|||
|
|
mov bp,0100 ;decryptor will start at 100h
|
|||
|
|
call rnd_get ;AX register will be random
|
|||
|
|
|
|||
|
|
call crypt ;call the engine
|
|||
|
|
|
|||
|
|
pop bx ;write crypted file
|
|||
|
|
mov ah,40
|
|||
|
|
int 21
|
|||
|
|
|
|||
|
|
mov ah,3E ;close the file
|
|||
|
|
int 21
|
|||
|
|
|
|||
|
|
pop es
|
|||
|
|
pop ds
|
|||
|
|
|
|||
|
|
mov di,offset filename ;adjust name for next file
|
|||
|
|
mov bx,7 ; (increment number)
|
|||
|
|
incnum: inc byte ptr ds:[bx+di]
|
|||
|
|
cmp byte ptr ds:[bx+di],'9'
|
|||
|
|
jbe numok
|
|||
|
|
mov byte ptr ds:[bx+di],'0'
|
|||
|
|
dec bx
|
|||
|
|
jnz incnum
|
|||
|
|
|
|||
|
|
numok: pop cx ;do it again...
|
|||
|
|
loop lop
|
|||
|
|
|
|||
|
|
exit: int 20
|
|||
|
|
|
|||
|
|
|
|||
|
|
;----------------------------------------------------------------------------
|
|||
|
|
; Text and data
|
|||
|
|
;----------------------------------------------------------------------------
|
|||
|
|
|
|||
|
|
starttxt db 'TPE-GEN - Generates 50 TPE encrypted test files.'
|
|||
|
|
db 0Dh, 0Ah, '$'
|
|||
|
|
|
|||
|
|
filename db '00000000.COM',0
|
|||
|
|
|
|||
|
|
|
|||
|
|
;----------------------------------------------------------------------------
|
|||
|
|
; The small test file that will be encrypted
|
|||
|
|
;----------------------------------------------------------------------------
|
|||
|
|
|
|||
|
|
hello: call next ;get relative offset
|
|||
|
|
next: pop dx
|
|||
|
|
add dx,10d ;find begin of message
|
|||
|
|
mov ah,09 ;print message
|
|||
|
|
int 21
|
|||
|
|
int 20
|
|||
|
|
|
|||
|
|
db 'Hello, world!', 0Dh, 0A, '$'
|
|||
|
|
db (100d) dup (90)
|
|||
|
|
|
|||
|
|
end begin
|
|||
|
|
|