Re: How to dump a certain number of tcp packets (for TCPDUMP) when an alert is fired

[Jason <security () brvenik com>]

preprocessor frag2
preprocessor stream4: disable_evasion_alerts
preprocessor stream4_reassemble
output log_tcpdump: filename alert.pcap

ruletype suspect {
  type log
  output log_tcpdump: suspicious.pcap
}

ruletype redalert
{
  type log
  output log_tcpdump: redalert.pcap
}

suspect tcp any any -> any 22 (msg:"I see port 22"; tag:session, 30, 
seconds; )

redalert tcp any any -> any 80 (msg:"I see port 80"; tag:session, 30, 
seconds; )




Loch Theary wrote:

> Hi again,
>
> Could you please publish a working snort.conf with the log_tcpdump ruletype and the corresponding suspicious rules of your 
> own ? because I have created a suspicious ruletype in my snort.conf and then use it in the local.rules, restart snort and it 
> doesn't work at all !!!!!!!
>
> I probably missed something but I can't figure out what ! :-(
>
> Could you help ?
>
> Regards,
> Theary
>
>
> -----Message d'origine-----
> De : Jason [mailto:security () brvenik com]
> Envoyé : lundi 6 septembre 2004 23:31
> À : Loch Theary
> Cc : Hart Clarence (rti1clh); emf () servervault com;
> snort-users () lists sourceforge net
> Objet : Re: [Snort-users] How to dump a certain number of tcp packets
> (for TCPDUMP) when an alert is fired
>
>
> You still want log_tcpdump however you can create another output type 
> for just the alerts you want to go into the tcpdump format file. You can 
> create as many alert types as you would like for different files for 
> different alerts... Just watch how they are ordered in the rare case you 
> hit a dependency.
>
> http://www.snort.org/docs/snort_manual/node16.html#SECTION00421000000000000000
>
> Loch Theary wrote:
>
>
> > Yes, I've tried that. But in this case, you do log all packets in
> > tcpdump format and not only the selected rules. And doing so, I don't
> > how many hard disks you will need for a big big network ! And If you
> > want to investigate further for some alerts, you will have to deal
> > with all alert ...
> >
> > I'm wondering if there is other ways to deal with the tcpdump format
> > than addinf the log_tcpdump directive in snort.conf.
> >
> > -----Message d'origine----- De : Jason [mailto:security () brvenik com] 
> > Envoyé : lundi 6 septembre 2004 17:07 À : Loch Theary Cc : Hart
> > Clarence (rti1clh); emf () servervault com; 
> > snort-users () lists sourceforge net Objet : Re: [Snort-users] How to
> > dump a certain number of tcp packets (for TCPDUMP) when an alert is
> > fired
> >
> >
> > I think you need to remove logto from the rules and use this in
> > snort.conf
> >
> > http://www.snort.org/docs/snort_manual/node13.html#SECTION00345000000000000000
> >
> >
> > Loch Theary wrote:
> >
> >
> >
> > > My respects all,
> > >
> > > It's doesn't work even with the "logto" directive.
> > >
> > >
> > >
> > >
> > > > These are my modified alert rule:
> > >
> > >
> > > > alert tcp $EXTERNAL_NET any -> $HTTP_SERVERS $HTTP_PORTS 
> > > > (msg:"WEB-MISC cross site scripting attempt"; 
> > > > flow:to_server,established; content:"<SCRIPT>"; nocase; 
> > > > logto:"/snort/logs/suspicious.tcpdump"; tag:session,50,packets; 
> > > > classtype:web-application-attack; sid:1497; rev:6;)
> > >
> > >
> > > > alert tcp $EXTERNAL_NET any -> $HTTP_SERVERS $HTTP_PORTS 
> > > > (msg:"WEB-ATTACKS mail command attempt"; 
> > > > flow:to_server,established; content:"/bin/mail"; nocase; 
> > > > logto:"/snort/logs/suspicious.tcpdump"; tag:session,50,packets; 
> > > > classtype:web-application-attack; sid:1366; rev:5;)
> > >
> > >
> > > > I can determine what I am doing wrong ...
> > >
> > >
> > > Anyone can help ?
> > >
> > > Regards, Theary
> > >
> > > -----Message d'origine----- De : Hart Clarence (rti1clh) 
> > > [mailto:CHart () ups com] Envoyé : vendredi 3 septembre 2004 15:40 À :
> > > 'emf () servervault com'; Loch Theary Cc : 
> > > snort-users () lists sourceforge net Objet : RE: [Snort-users] How to 
> > > dump a certain number of tcp packets (for TCPDUMP) when an alert is
> > > fired
> > >
> > >
> > > If you use the alert tag where are the log files going to go? ( 
> > > filenames /or database)
> > >
> > >
> > > C
> > >
> > >
> > > -----Original Message----- From: Erik Fichtner 
> > > [mailto:emf () servervault com] Sent: Thursday, September 02, 2004
> > > 12:55 PM To: Loch Theary Cc: snort-users () lists sourceforge net
> > > Subject: Re: [Snort-users] How to dump a certain number of tcp
> > > packets (for TCPDUMP) when an alert is fired
> > >
> > >
> > > -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1
> > >
> > > On Thu, Sep 02, 2004 at 05:05:02PM +0200, Loch Theary wrote:
> > >
> > >
> > >
> > > > Could you please tell me how to log a certain number of packets 
> > > > when an alert is fired (tcp dump format) ?
> > >
> > >
> > > "tag:session,${NUMBER},packets;"
> > >
> > > - -- Erik Fichtner Principal Engineer, Information Security, 
> > > ServerVault Corp. 703-652-5900 -----BEGIN PGP SIGNATURE-----
> > > Version: GnuPG v1.0.7 (FreeBSD)
> > >
> > > iD8DBQFBN1BXQ7EzrewLMS0RAo44AKDAQNM0GLBXm871a181TEspE0gdvwCgu8fk 
> > > DM4p3ty2fTBlymbrsqyv5tA= =SBUM -----END PGP SIGNATURE-----
> > >
> > >
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