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 Forums >>  Debuggers  >>  Unable to put breakpoint in polymorphic obfuscated proggy

Topic created on: June 17, 2009 02:37 CDT by JavaGuru .

Hi

I got a program... It's heavily obfuscated and have advanced polymorphic techniques.

When I load program in olly if I change 1 single JNZ to JMP it doesn't work...

I found ONE of checker functions and I fixed that checker, so for little time I don't have problem with fixing some parts of it.

But problem comes here... This program loads most of it's code and functions in runtime from obfuscated and encrypted parts inside exe.

When I put a breakpoint in anywhere OUTSIDE of code section or even in code section (some times) I cannot get program running...

Program moves application to a crasher function and I get a lot of exceptions and finally program exits.

I tried Phant0m and I enabled all functions of Phant0m to hide debugger, but I wasn't lucky... Again if I put a breakpoint program calls a function which causes crash... I cannot locate this crasher function, just I get crash if I put breakpoint...

Any ideas?

Thanks from now!

  cod     June 17, 2009 03:29.10 CDT
The sections of code have a CRC value and putting a breakpoint the crc check fails... Probably these functions are routine into SEH handlers. What's your debugger?

  detlef   June 17, 2009 03:48.25 CDT
have you tried to use hardware breakpoints?
They do not manipulate the code. But of course they are detectable, too.

  pp7   June 19, 2009 12:23.03 CDT
Any chance of telling us what program this is?  Sounds interesting.

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