How to modify an executable without corrupting it?


Is there a specific null char or a sequence of bytes which would not corrupt the executable if added in FRONT of the file? I tried adding NUL (00 hex) but it corrupts the executable every time. Is there some bytecode for NOP (no operation) or something similar?

Long story short, I want to mess up a “hack” that modifies a value in memory at &process+fixed offset. Pushing the memory stack up would (or so I think) prevent it from working.


No, the PE file format that Windows executables use has a very specific header. See for more details.

You can try using ASLR to make your code more resistant to in-memory patching.

Answered By – Jonathan Potter

This Answer collected from stackoverflow, is licensed under cc by-sa 2.5 , cc by-sa 3.0 and cc by-sa 4.0

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