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Network Security Snort-Signatures
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[Snort-sigs] FPs for "SMTP possible BDAT DoS attempt"

from [Russell Fulton] Network Security [Permanent Link]
Subject: [Snort-sigs] FPs for "SMTP possible BDAT DoS attempt"
Date: Thu, 05 Jul 2007 13:45:25 +1200 
I'm seeing lots of hits on this rule from reputable mail servers
including Google.  Hits appear to occur in encoded text.

alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP possible BDAT
DoS attempt"; flow:to_server,established; content:"BDAT"; nocase;
byte_jump:2,1,relative,string,dec; content:!"|0D 0A|"; within:2;
reference:bugtraq,4204; reference:cve,2002-0055;
reference:url,www.microsoft.com/technet/security/bulletin/ms02-012.mspx;
classtype:denial-of-service; sid:10995; rev:1;)

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