Query on ClamAV preprocessor in snort-2.3.3

[Jason Haar <Jason.Haar () trimble co nz>]

I am now successfully using the ClamAV plugin, but there's one thing 
I've noticed. It appears that it works by dumping the data component of 
*single packets* out to disk and then runs clamav over it (not the 
binary - the library API of course). But it does look like single 
packets. This must mean there are tonnes of ClamAV signatures that don't 
get a chance to trigger.

Assuming I am correct, is there a reason for this? I mean, snort itself 
"merges" multiple packets into streams, so why can't ClamAV code be 
called after the stream has been aggregated? And yes, I know snort 
doesn't reconstitute entire TCP conversations - but even 10 packets of a 
stream would be better than one?

PS: yes  - you do need bigger CPUs. I have 16 systems in place and all 
ran below 0.6 load average. Now with ClamAV the busiest are running at 
1.5 - i.e. I'll need to upgrade to faster hardware if I expect to really 
use this.

--
Cheers

Jason Haar
Information Security Manager, Trimble Navigation Ltd.
Phone: +64 3 9635 377 Fax: +64 3 9635 417
PGP Fingerprint: 7A2E 0407 C9A6 CAF6 2B9F 8422 C063 5EBB FE1D 66D1



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