Snort mailing list archives
Re: normal vs. malicious icmp echo
From: Erik Fichtner <emf () servervault com>
Date: Wed, 5 May 2004 23:57:08 -0400
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On Wed, May 05, 2004 at 10:25:42PM -0500, Mario Guerendo wrote:
I just wanted to know if anybody had a snort rule available that would differentiate a normal ICMP echo ping from a malicious one? If so, would you be willing to share it?
per RFC3514 [1], the following should work: alert icmp any any -> any any (msg: "Evil ICMP Ping"; itype:8; fragbits: -M; fragoffset: >4095;) Though, to be fully RFC3514 compliant, you might want to start your snort instance with a pcap filter specified on the command line like: snort $ARGS 'ip[6] & 32 != 0' [1] ftp://ftp.rfc-editor.org/in-notes/rfc3514.txt PLEASE read the RFC before you use this. - -- Erik Fichtner Principal Engineer, Information Security, ServerVault Corp. 703-652-5900 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.7 (FreeBSD) iD8DBQFAmbeUQ7EzrewLMS0RApdCAKC1J4o6pft8c8//UmYd3ryPRUuifwCgszyv /7g9j4eYgYEeEdubMGNdKvQ= =qXLq -----END PGP SIGNATURE----- ------------------------------------------------------- This SF.Net email is sponsored by Sleepycat Software Learn developer strategies Cisco, Motorola, Ericsson & Lucent use to deliver higher performing products faster, at low TCO. http://www.sleepycat.com/telcomwpreg.php?From=osdnemail3 _______________________________________________ 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
Current thread:
- normal vs. malicious icmp echo Mario Guerendo (May 05)
- Re: normal vs. malicious icmp echo Erik Fichtner (May 05)
- Re: normal vs. malicious icmp echo Matt Kettler (May 06)
- Re: normal vs. malicious icmp echo Milo Velimirovic (May 06)