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 Forums >>  Debuggers  >>  Stop at system dlls.

Topic created on: October 30, 2012 02:58 CDT by dewew .

How I can make my ollydbg or immunity debugger to stop at calling system dlls?

  waleedassar     October 30, 2012 15:01.26 CDT
Options --> Debugging Options ---> Events ---> Break on new module (DLL).
This causes OllyDbg to pause at the point the "ZwMapViewOfSection" function has just returned.

If you want to break at the "DllMain" function of a system DLL, instruct OllyDbg to pause at "System Breakpoint", select ntdll.dll from executable modules table (ALT+E), and then CTRL+S to search for the following sequence of instructions.

push [ebp+0x14]
push [ebp+0x10]
push [ebp+0xC]
call [ebp+0x8]

Place a breakpoint on the call [ebp+0x8] instruction. Each time the breakpoint is hit, inspect the stack to see if it is the system dll you are expecting.

I am not sure if Immunity has a built-in command for that. In Windbg, it is much easier.

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