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Break and Trace Condition

 
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Snooman
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PostPosted: Sun May 08, 2016 8:50 am    Post subject: Break and Trace Condition Reply with quote
I am trying to break and trace some code which is used for multiple things.
So I want to trace it in a special condition I need.

In my case this is ECX==0x145E4168 - for example.

The break+trace window offers only a STOP condition, but that's not what i need. This way I get all kinds of traces, but not for the case I need it for.

Is there a way to start the trace only if the given register has the required value?
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ParkourPenguin
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PostPosted: Sun May 08, 2016 9:07 am    Post subject: Reply with quote
  1. If needed, pause the process using the Advanced Options window (bottom left in the main CE window).
  2. Set the break and trace at an instruction.
  3. Go to View -> Breakpointlist.
  4. Right click on the breakpoint and select "Set/change condition".
  5. Set whatever condition you want.
  6. Click on "OK" and unpause the process if you paused it.
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Zanzer
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PostPosted: Sun May 08, 2016 9:08 am    Post subject: Reply with quote
I normally just write an injection script to do that.
Code:
newmem:
  cmp ecx,145E4168
  jne code
  nop // set breakpoint here
code:
  //regular instruction
  jmp return
INJECT:
  jmp newmem // make sure it jumps to your compare
return:
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Snooman
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PostPosted: Wed May 11, 2016 9:49 am    Post subject: Reply with quote
Zanzer wrote:
I normally just write an injection script to do that.
Code:
newmem:
  cmp ecx,145E4168
  jne code
  nop // set breakpoint here
code:
  //regular instruction
  jmp return
INJECT:
  jmp newmem // make sure it jumps to your compare
return:


This idea I had in mind too, but maybe there is a more practical way I dont know yet.

Thanks to both for your answers Very Happy
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