[Full-disclosure] RE: when will AV vendors fix this???
whistl0r at googlemail.com
Mon Aug 7 19:20:03 BST 2006
> -----Original Message-----
> From: Bipin Gautam
> Sent: Saturday, August 05, 2006 9:21 AM
> Subject: when will AV vendors fix this???
> to keep things simple, let me give you a situation;
> if there is a directory/file a EVIL_USER is willing to hide from
> antivirus scanner all he has to do is fire up a command prompt & run
> the command;
> cacls.exe TORJANED_FILE_OR_DIRECTORY_NAME /T /C /P EVIL_USER:R
> next time EVEN when the administrator starts the antivirus "system
> scan" the TORJANED_FILE_OR_DIRECTORY_NAME will be effectively
> bypassed as the ownership of the directory is just of the user account
> named; EVIL_USER and the antivirus "manual scan" is running just with
> the privilage of ADMINISTRATOR>
> by this way a malicious executable can remain hidden in the system
> BYPASSING THE SCAN even when the AV scanner is run by administrator!!!
But I cannot execute this file, becaus I have no access.
If I get access, the anti-virus program will also get access...
So I might be able hide something, but I can't do anything.
Also, to hide something, I have to bypass the autoprotection... You
shouldn't be able to do this...
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