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Created: Tuesday, December 13 2011 15:35.09 CST

Modified: Monday, February 27 2012 17:48.28 CST

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ICanAttach, a plugin to bypass anti-attaching tricks.

Author: waleedassar

# Views: 15330

I have recently created an ollydbg plugin, ICanAttach, to bypass the "DbgUiRemoteBreakin", "DbgBreakPoint", and "NtContinue" anti-attach tricks.

It has only been tested on XP SP3 and WOW64 windows 7.

Glad if someone tests it on other OSes and gives me some feedback.

http://ollytlscatch.googlecode.com/files/ICanAttach2.dll
Source code
http://ollytlscatch.googlecode.com/files/ICanAttach.rar

For more info:
http://waleedassar.blogspot.com/2011/12/debuggers-anti-attaching-techniques.html
http://waleedassar.blogspot.com/2011/12/debuggers-anti-attaching-techniques_11.html

Blog Comments

PeterFerrie	Posted: Thursday, December 15 2011 10:55.48 CST
but a thread that checks the code for these APIs will detect the change, so you have a race condition in that case.

waleedassar

Posted: Friday, December 16 2011 16:52.19 CST

Cool, thanks alot, Peter.

My plugin has been updated to cover that scenario. Now, it hooks the "DbgUiIssueRemoteBreakin" function,, rather than the "DebugActiveProcess" function.

1) In DbgUiIssueRemoteBreakin (in ollydbg.exe), the seventh parameter passed to RtlCreateUserThread has been changed to be my own code.

2) In the target process, all relative offsets in ntdll.dll to ZwContinue have been fixed to be offsets to my own NtCOntinue.

The updated plugin
http://ollytlscatch.googlecode.com/files/ICanAttach2.dll

Glad to see any demos. Waiting for any feedback.

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