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Network Security Snort-Signatures
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Re: [Snort-sigs] simple rule for detect ssl/ssh tunneling session

from [Nigel Houghton] Network Security [Permanent Link]
Subject: Re: [Snort-sigs] simple rule for detect ssl/ssh tunneling session
Date: Wed, 14 Sep 2005 16:17:45 -0500 
On  0, rmkml <rmkml@free.fr> allegedly wrote:

Hi,

please check and please add this simple/short rule :

bad-traffic.rules:alert tcp any any -> any !139 (msg:"BAD-SSL tcp 
detect"; flow:stateless; content:"|00 0E|"; depth:4; offset:0;)

this rule, for me, detect openvpn tunneling,

but, of course, many false positive : 139, 443, 3389 ...

improvements are welcome

Regards
Rmkml


Thanks for that, if you could submit your rules using the form at
http://www.snort.org/reg-bin/rulesubmit.cgi that would be spiffy. I
think this rule will need quite a lot of tweaking to get rid of those
false positives though :)

+--------------------------------------------------------------------+
     Nigel Houghton      Research Engineer       Sourcefire Inc.
                   Vulnerability Research Team

 I require a window seat and an inflight Happy Meal, and no pickles! 
 God help you if I find pickles!


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