full-disclosure - Backdoor not recognized by Kaspersky

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From: Bart.Lansing at kohls.com (Bart.Lansing@...ls.com)
Subject: Backdoor not recognized by Kaspersky

Cael...take a more sensible approach...no password parsing to scan
needed...have the AV/mail gateways stop any zip with any executable inside.
You don't need to use the password to see that there is an
.exe/.scr/.com/.whatever inside a zip.  You see it, you nuke the zip. If
your policies allow zipped executables to meander through your mail system
as long as they pass a virues scan, you must have damned busy 0 days.  This
ain't complicated...at all.

Bart Lansing
Manager, Desktop Services
Kohl's IT

> Leave passworded .zips alone -- take the sensible approach and catch an
> infected file once it's been extracted.
>
> Cael

full-disclosure-admin@...ts.netsys.com wrote on 03/03/2004 08:56:34 AM:

> >> Another variant against the Netsky virus. It's is packed with
> >> UPX. It spreads with the password protected zip file, which
> >> gets bypassed through all most all the AV scanners with
> >> latest signature updates because No AV can decrypt it
> >> without the password. (though password is in the message
> >> content), we humans tend to open it after reading the message.
> >
> > Kaspersky, NAI and possibly some other AV-vendors now parse the
password
> > from the body of the email to extract the zip and then scan it.
> > Obviously this only helps if it can scan the complete email i.e. on the

> > mailserver. They might need to adapt to new varitions of how the
> > password is included in the body, which will take some analysis when
new
> > variants emerge.
>
> Does anyone else find this new development a bad idea?
>
> I'm of the mindset that anti-virus companies should stick with what
> they're good at -- namely, detecting and handling infected files.  It
> seems a bad idea to start down the natural language processing road.
> Are they scanning just for Bagle/Beagle style e-mail, or are their
> methods more general?  What about messages of the form:
>
> 'Password is a long yellow fruit enjoyed by monkeys.'
>
> What about messages in languages other than English?  I can easily see
> this becoming an arms-race, and one the anti-virus folks have no chance
> of winning.
>

>
> _______________________________________________
> Full-Disclosure - We believe in it.
> Charter: http://lists.netsys.com/full-disclosure-charter.html

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