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Re: [Snort-users] help with rules - data capturing

from [Timothy Ding] Network Security [Permanent Link]
Subject: Re: [Snort-users] help with rules - data capturing
Date: Fri, 21 Dec 2007 17:01:15 -0800 
many thanks for the reply Paul, i still don't get any results from the rule,
could it possibly be the version of snort (ver 2.3.3) that i am using?

Regards,
Tim



I think it should work pretty much as-is, but here is how I would
write the rule:

alert tcp any any -> $HOME_NET 13001 (msg: "GPRMC found in packet"; \
flow:to_server,established; content:"|24|GPRMC"; nocase; sid:9999000;)

Use the flow: directive to only analyze packets that are in-state for
the connection described.  I also hexified the $ in $GPRMC just to be
safe.  That way it doesn't get treated like a variable by anything
that parses that rule.  And then use some non-published sid value so
that if you're using BASE, SGUIL, or something else that lets you
search/sort by sid values, you can access it.

PaulM


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