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Network Security Snort-Signatures
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[Snort-sigs] False +ves on 2586 -- P2P eDonkey transfer

from [Russell Fulton] Network Security [Permanent Link]
Subject: [Snort-sigs] False +ves on 2586 -- P2P eDonkey transfer
Date: Thu, 11 Nov 2004 10:32:14 +1300 
GEN:SID   1:2586   
Message  P2P eDonkey transfer   

Rule alert tcp $HOME_NET 4242 <> $EXTERNAL_NET any (msg:"P2P eDonkey
transfer"; flow:established; content:"|E3|"; depth:1;
reference:url,www.kom.e-technik.tu-darmstadt.de/publications/abstracts/HB02-1.html;
 classtype:policy-violation; sid:2586; rev:1;)

I am seeing significant numbers of false +ve on this rule for data
coming back from web servers where the source port happens to be 4242
and the first byte of the packet is 0XE3.  I wonder if a to_server would
fix this?  (since I don't know the EDonkey protocol it may be the server
that send the E3 in which case this won't work).

-- 
Russell Fulton, Information Security Officer, The University of Auckland
New Zealand



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