manolisgavriilhotmail.com
Date: Fri Aug 05 2005 - 18:28:01 CDT

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Hi,

A possible design flaw i encountered during my research on Microsoft's AntiSpyware(Beta Version).

Summary:
Bypassing Microsoft's AntiSpyware alerting system on programs trying to access Registry.

Details:
When a program is trying to write to Registry Startup Keys like for example HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run a pop-up message is produced by Microsoft's AntiSpyware informing the user for a change at Windows Registry.Although this is working when the registry key has a file extention,Microsoft's AntiSpyware doesnt bother when the same Registry key doesnt have an extention.That wouldnt be a problem if Windows itself didnt execute the file in the registry key with no extention. But they do! So for example:
"HKEY_LOCAL_MACHINE/SOFTWARE/Microsoft/Windows/CurrentVersion/Run" With key "Emmgav", "C:\Windows\repair\svc.exe"
and
"HKEY_LOCAL_MACHINE/SOFTWARE/Microsoft/Windows/CurrentVersion/Run" With key "Emmgav", "C:\Windows\repair\svc"
For Microsoft AntiSpyware isnt exactly the same!

Vulnerable Versions:
Tested on Microsoft AntiSpyware (BETA) 1.0.615

Exploit:
Design Flaw, exploit not needed.

Cheers,

Emmanouil Gavriil(manolisgavriilhotmail.com)

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