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Topic created on: October 30, 2007 12:14 CDT by bodzcount .

I have a function that uses several exceptions int1, int3, ea violation...

I can trace it with olly and with x86emu, but ida's tracing engine fails. is the ida debugger really that bad?

jms		October 30, 2007 14:59.10 CDT
Yes, it really is. Stick with Olly/WinDbg and if you're a Python kinda guy use ImmunityDebugger and its ImmLib API.

bodzcount		October 30, 2007 15:11.29 CDT
hmm so i have to write a plugin to get my ollytrace into ida somehow...

aeppert		October 30, 2007 15:23.27 CDT
Or, as a lot of us likely do, apply your debugging knowledge to your static analysis. I work in a different environment than most folks around, I would imagine, but I generally cannot mix my IDA analysis and dynamic analysis easily. As such, it is second nature for me to use a debugger as a means of augmenting my static analysis and vice-a-versa. IDA's debugger has come a long way and you are free to write plugins to make it better as you see fit. Plus, it does appear 5.2 will have some rather nice enhancements. I think the best approach would be ImmunityDebugger plus a few python scripts to dump what you want and then incorporate that data back into IDA. IDA Pro's database and layout makes a really logical and well-suited place to store knowledge in my experience. Not perfect perhaps, but much better than data spread across numerous disjoint environments.

bodzcount		October 30, 2007 15:58.52 CDT
I want to do deobfuscation. Combining static and dynamic analysis is really helpfull for this. (finding dead code, fake conditional jumps, constant propagation, etc..)

nezumi		October 30, 2007 19:51.12 CDT
to debug apps using int 1 or int 3, just go to the Debug -> Debugger options -> Exceptions and change EXCEPTION_BREAKPOINT and EXCEPTION_SINGLE_STEP from Handled by Debugger to Handled by Application.

bodzcount		October 31, 2007 03:27.12 CDT
that was how i expected it to work....

nezumi		October 31, 2007 15:52.14 CDT
it works, no doubts. Debugger passes an exception to the app. a self-traced program works fine. if not, well, there is something else. another anti-debug trick(s). I think, I can help you, just tell me (PM or here) what you're trying to debug and where I can get it.

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