full-disclosure - Backdoor not recognized by Kaspersky

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Message-ID: <40461FD0.2090609@onryou.com>
From: lists2 at onryou.com (Cael Abal)
Subject: Backdoor not recognized by Kaspersky

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> McAfee now detects the password protected zip files.  (There are other
> things you can look for besides trying to decrypt the contents of the
> zip filel  Also, zip passwords are weak and easily broken anyway.)

Zip files may be /relatively/ easy to brute force, sure, but there's no
way I'm turning my mail gateway into a dedicated .zip cracking box.
That's insane.

As I mentioned, passworded .zip handling is an arms-race I hope
anti-virus folks decide not to get embroiled in.

It would be trivial to generate a file_id.diz (or readme.txt, or add zip
comments, etc.) in order to skirt checksum / file size checks.  It would
be trivial to harvest plausible file names from a victim's computer to
avoid filename matching checks.

The only reasonable check would be what Bart suggests, but I'm not
comfortable blocking all passworded .zip files containing an executable.
   Who knows, I might have to change my mind.

Cael

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