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Index > Windows > How to write self-modifying PE file?

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OzzY



Joined: 19 Sep 2003
Posts: 1029
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OzzY
Is it possible to write a PE exe program that will modify itself in memory and write this new version of itself to another exe, for example "prog2.exe"? how to do it? maybe using CreateFileMapping API?

Thanks!
Post 15 Sep 2005, 14:43
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Vasilev Vjacheslav



Joined: 11 Aug 2004
Posts: 392
Vasilev Vjacheslav
yes, it possible
Post 15 Sep 2005, 16:03
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OzzY



Joined: 19 Sep 2003
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OzzY
How?
Post 15 Sep 2005, 16:40
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okasvi



Joined: 18 Aug 2005
Posts: 382
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okasvi

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Post 15 Sep 2005, 18:15
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f0dder



Joined: 19 Feb 2004
Posts: 3170
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f0dder
OzzY, it's not possible to have this working for all windows versions.

The most reliable way, if you really must do this, is to have an external app write to your .exe file.
Post 17 Sep 2005, 22:59
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OzzY



Joined: 19 Sep 2003
Posts: 1029
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OzzY
Maybe copy the program to a second .EXE file, and execute it with some command line option to write to the first .EXE?
Post 18 Sep 2005, 00:40
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f0dder



Joined: 19 Feb 2004
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Location: Denmark
f0dder
Yes, that would work. It's clumsy, though.

Another method that "works okayish" would be to inject code to some other process... but that's even more of a kludge. Forget all about the "cute" tricks that unmap the process etc.
Post 18 Sep 2005, 02:23
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comrade



Joined: 16 Jun 2003
Posts: 1137
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comrade
u can check example called 'selfsave' on my homepage
http://comrade.ownz.com/sources/selfsave.zip
Post 18 Sep 2005, 15:35
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Remy Vincent



Joined: 16 Sep 2005
Posts: 155
Location: France
Remy Vincent
Turbo GREP 5.5 Copyright (c) 1992, 1999 Inprise Corporation
Syntax: GREP [-rlcnvidzuwo] searchstring file[s] or @filelist
Options are one or more option characters preceded by "-", and optionally
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-r+ Regular expression search -l- File names only
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-u xxx Create a copy of grep named 'xxx' with current options set as ...
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Post 18 Sep 2005, 17:16
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