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[Snort-users] help with rules - data capturing

from [Timothy Ding] Network Security [Permanent Link]
Subject: [Snort-users] help with rules - data capturing
Date: Fri, 21 Dec 2007 12:20:43 -0800 
dear list,

i need some pointer in writing a rule to capture data with keyword $GPRMC
coming from port 13001 into snort database. is this possible with snort?
would appreciate any advice.

alert tcp any any -> $HOME_NET 13001 (content: "$GPRMC"; \
msg: "display some message" ;)

ngrep results

###
T 66.xx.xx.xx:30722 -> 20.xx.xx.xx:13001 [AP]
........g...%356939010000676,$GPRMC,002038.000,A,3357.6423,N,1156.98828,W,
0.46,158.11,211207,,,D,+113836653,03d.....................
#######
T 66.xx.xx.xx:30722 -> 20.xx.xx.xx:13001 [AP]
........g...%356939010000676,$GPRMC,002348.000,A,3357.6416,N,1156.98827,W,
0.19,169.61,211207,,,D,+113836653,08d.....................
#####

regards,
Tim

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