Design Flaw at Microsoft's AntiSpyware
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(manolisgavriil@xxxxxxxxxxx)