RE: reading a new rule.

["samwun" <samwun () hgcbroadband com>]

-----Original Message-----
From: snort-users-admin () lists sourceforge net
[mailto:snort-users-admin () lists sourceforge net] On Behalf Of Erek Adams
Sent: Monday, August 11, 2003 8:11 PM
To: samwun
Cc: Pig-A-Holics Anonymous
Subject: RE: [Snort-users] reading a new rule.

On Mon, 11 Aug 2003, samwun wrote:

> I still have a problem here. I want snort detect the following
> signature:
>
> POST /index.html?crap=10601855
>
> It is in the tcp data section. How can I write a rule for it and how
to
> set it up and run by snort?

Read the docs [0].  Read the current rules for an example.

> From web-misc.rules:

  alert tcp $EXTERNAL_NET any -> $HOME_NET $HTTP_PORTS (msg:"WEB-MISC
  globals.pl access"; flow:to_server,established;
  uricontent:"/globals.pl";  reference:cve,CVE-2001-0330;
  reference:bugtraq,2671; classtype:web-application-activity;
  sid:2073; rev:1;)

So modify that to work for your need.

    alert tcp $EXTERNAL_NET any -> $HOME_NET $HTTP_PORTS (msg:"WEB-MISC
    crap=10601855 access";  flow:to_server,established;
    uricontent:"/index.html?crap=10601855"; sid:1000001; rev:1;)

Not too hard is it?


It still didn't work. But I can see that tcpdump can record this
traffic.

I also tried all the following rules are not working:

alert tcp any any -> any any (msg:"WEB-MISC 0 crap=10601855 access ";
flow:to_server,established; uricontent:"/index.html?crap="; sid:1000001;
rev:1;)

alert tcp $EXTERNAL_NET any -> $HOME_NET $HTTP_PORTS (msg:"WEB-MISC 1
crap=10601855 access "; flow:to_server,established;
uricontent:"/index.html?crap="; sid:1000001; rev:1;)

alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"WEB-MISC 2
crap=10601855 access "; flow:to_server,established;
uricontent:"/index.html?crap="; sid:1000001; rev:1;)

I also assigned the following variable and values in snort.conf file:

var HOME_NET 192.168.1.0/24
var EXTERNAL_NET 213.190.178.0/24
var HTTP_PORTS 8888


The snort command I used is:

Snort -c /usr/local/snort.2.0.0/etc/snort.conf

Thanks
Sam

-----
Erek Adams

   "When things get weird, the weird turn pro."   H.S. Thompson


[0]     http://www.snort.org/docs/writing_rules/


-------------------------------------------------------
This SF.Net email sponsored by: Free pre-built ASP.NET sites including
Data Reports, E-commerce, Portals, and Forums are available now.
Download today and enter to win an XBOX or Visual Studio .NET.
http://aspnet.click-url.com/go/psa00100003ave/direct;at.aspnet_072303_01
/01
_______________________________________________
Snort-users mailing list
Snort-users () lists sourceforge net
Go to this URL to change user options or unsubscribe:
https://lists.sourceforge.net/lists/listinfo/snort-users
Snort-users list archive:
http://www.geocrawler.com/redir-sf.php3?list=snort-users



-------------------------------------------------------
This SF.Net email sponsored by: Free pre-built ASP.NET sites including
Data Reports, E-commerce, Portals, and Forums are available now.
Download today and enter to win an XBOX or Visual Studio .NET.
http://aspnet.click-url.com/go/psa00100003ave/direct;at.aspnet_072303_01/01
_______________________________________________
Snort-users mailing list
Snort-users () lists sourceforge net
Go to this URL to change user options or unsubscribe:
https://lists.sourceforge.net/lists/listinfo/snort-users
Snort-users list archive:
http://www.geocrawler.com/redir-sf.php3?list=snort-users