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jhonny6721



Joined: 07 Aug 2014
Posts: 26
jhonny6721
Hello, I, m trying to build my own DOS STUB, for example, a DOS Version of a Win32 executable. I don, t know how to do kt using fasm. I am looking for this feature around the net but i can, t find it.

Please, give a step by step guide, or a short code fragment. Thanks for your answers.

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Post 26 Aug 2014, 03:58
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17284
Location: In your JS exploiting you and your system
revolution
Here is some very BasicStub.asm code which you can expand to your needs:
Code:
format MZ
segment zz
entry zz:entry
stack 128
heap 0

entry:
push cs
pop ds
mov ah,9
mov dx,message
int 21h
mov ax,4cffh
int 21h
message:
db 'Windows 95 or higher required for this program!',0dh,0ah,'$'    
And for the Win32 portion you can use something like this:
Code:
format PE GUI 4.0 on 'BasicStub.exe'

include 'win32ax.inc'

.code

  start:
        invoke  MessageBox,HWND_DESKTOP,"Hi! I'm the example program!","Win32 Assembly",MB_OK
        invoke  ExitProcess,0

.end start    
Notice the format directive tells fasm which file to use for the stub.
Post 26 Aug 2014, 04:31
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jhonny6721



Joined: 07 Aug 2014
Posts: 26
jhonny6721
revolution Thanks for your answer. It was very useful to fix my problem.

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Post 27 Aug 2014, 20:42
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