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Created: Tuesday, December 27 2011 00:25.13 CST  
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A new Anti-Olly trick.
Author: waleedassar # Views: 4905

It is a buffer overflow in ollydbg v1.10. It occurs when olly tries to find the .sym file for the being-loaded module.



POC:
http://ollytlscatch.googlecode.com/files/trick.exe
https://docs.google.com/document/d/1T5LPY3qDkxmR1XVgxnsKW42lggS5iSjtQwFXOtNfqMM/edit

Further details:
http://waleedassar.blogspot.com/2011/12/new-ollydbg-anti-debug-trick.html


http://www.virustotal.com/file-scan/report.html?id=97f2c22d3fde1db56aaef4e555e32927d0a0087e7e92d369093ac5ac749e83d9-1324964958


Blog Comments
PeterFerrie Posted: Tuesday, December 27 2011 10:04.17 CST
This bug was known since 2008.
I even described it publicly in Virus Bulletin.
http://pferrie.host22.com/papers/unpackers21.pdf

waleedassar Posted: Tuesday, December 27 2011 15:42.56 CST
It is different from those mentioned in your really wonderful paper. This one is in ollydbg.exe, not dbghelp.dll.



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