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problems with Rule using PCRE
From: "Document Retention" <document.retention () gmail com>
Date: Wed, 7 Jan 2009 12:48:10 -0500
Greetings, I am having an issue with false positives for a rule using PCRE. alert tcp any any ( content:"|BE EF|"; depth:2; pcre:"/^.{1}(|\x07|\x17|\x27|\x37|\x47|\x57|\x67|\x77|\x87|\x97|\xA7|\xB7|\xC7|\xD7|\xE7|\xF7)/iR" sudo : make sure it is beef, then match anything for 1 byte, then match these hex values relative to last match. I am trying to match the 4th byte in ( offset 3 ). data : BE EF 01 07 ....... should trigger rule However, It seems as thought the pcre will continue to look through the rest of the packet (until the end) How can I get it to look only at the 4th byte ? Any help would be greatly appreciated. Thanks, DR
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