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