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 Forums >>  Brainstorms - General  >>  Static UNICODE_STRING buffer in TIB

Topic created on: July 30, 2012 16:32 CDT by 0x200x20 .

On offset 0xBF8 in TIB there is some UNCODE_STRING buffer. It seems to be used permanently in ReactOS by ASCII Winapi functions but I cannot find where it is used by original Windows. I have tried to put hardware breakpoint on it (Win 7 x64) but it seems it has never been used. Could you please tell by which API could it be used?

  waleedassar     July 30, 2012 17:33.44 CDT
It is not used in Windows 7 (64-bit), neither in native x64 processes nor in Wow64 processes. In native x64 processes, the whole UNICODE_STRING structure is set to zero and in Wow64 processes, it just has an empty string

According to the link below, it has been found to be an anti-debug trick for Vista (32-bit). Actually i don't have Windows Vista (32-bit) to test.
http://www.symantec.com/connect/articles/windows-anti-debug-reference

  0x200x20     July 31, 2012 14:34.21 CDT
Thanks a lot, waleedassar.

  waleedassar     August 12, 2012 22:37.42 CDT
To investigate more about this structure, you can check the "ntdll!LdrpLoadImportModule" function in XP. Just in case someone needs that.

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