To: Theodore Tso <tytso@mit.edu>
Cc: douglas.leeder@sophos.com, linux-kernel@vger.kernel.org,
       linux-security-module@vger.kernel.org, malware-list@lists.printk.net
Subject: Re: [malware-list] [RFC 0/5] [TALPA] Intro to alinuxinterfaceforonaccess scanning
In-Reply-To: Your message of "Fri, 15 Aug 2008 09:55:37 EDT."
             <20080815135537.GN13048@mit.edu>
From: Valdis.Kletnieks@vt.edu
References: <20080815131621.GK13048@mit.edu> <20080815132227.6BF0431678F@pmx1.sophos.com>
            <20080815135537.GN13048@mit.edu>
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Date: Fri, 15 Aug 2008 11:42:26 -0400
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On Fri, 15 Aug 2008 09:55:37 EDT, Theodore Tso said:
> On Fri, Aug 15, 2008 at 02:22:27PM +0100, douglas.leeder@sophos.com wrote:
> > 
> > This is a problem for current anti-malware scanning, as virus data updates 
> > come every few hours
> 
> Every few hours?!?  I hadn't noticed Windows AV programs getting
> updates that frequently, at least not the ones that I've been familiar
> with.  (Semantec, Norton, McAfee)

Try running a mail server that provides virus scanning for a large population
of 100K or so mailboxes.  You end up pulling from your vendor on an hourly
basis, just because a virus on a burn through your userbase can toast you that
quickly.

Since 9AM Sunday (is now 11:30AM Friday as I write this), we've pulled new
signatures 33 times (one new signature each time in this case) from our vendor.
So yeah, about once every 3-4 hours we get a new updated one for a new variant
of whatever.  I've seen times when we've pulled a new signature file 3 hours in
a row, and each time there were 10-12 new variants, so averaging 12/hour...


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