[Full-disclosure] RE: when will AV vendors fix this???

[Dude VanWinkle]

On 8/7/06, Thomas D. <whistl0r at googlemail.com> wrote:
>
> > -----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.

Well, there would be an access denied message for most AV scanners
when it hit the file in question and couldnt even get a read.

-JP