Snort mailing list archives
Re: Rule opinions
From: Gary Flynn <flynngn () jmu edu>
Date: Tue, 24 Jun 2003 11:41:43 -0400
Kreimendahl, Chad J wrote:
Maybe a better name for it would be "NETBIOS net send"... that's the command they use to send you spam to your windows box.
Actually, if its going to port 135, its not netbios. Its an RPC service. To my knowledge, that is the way the bulk messenger spams are being sent nowadays even though they can also be sent via netbios to 139. Also, I just saw a post indicating that the spammers are getting around port 135 blocks by directly addressing the messenger service port. Port 135 is a port mapper. People contact it to find out where the service they are interested in using is listening. It works like the unix port mapper. If the Messenger service always listens on the same port and the spammers know where it is, there is no need for them to contact the port mapper first. The warning I saw said they were spamming port 1026. In my tests, a seemingly random port opened up when a message was sent but I didn't test too much. If the Messenger Service does indeed listen on 1026 most of the time, we're going to have more problems shortly. Here is some more background info: http://www.jmu.edu/computing/security/info/winmsg.shtml -- Gary Flynn Security Engineer - Technical Services James Madison University Please R.U.N.S.A.F.E. http://www.jmu.edu/computing/runsafe ------------------------------------------------------- This SF.Net email is sponsored by: INetU Attention Web Developers & Consultants: Become An INetU Hosting Partner. Refer Dedicated Servers. We Manage Them. You Get 10% Monthly Commission! INetU Dedicated Managed Hosting http://www.inetu.net/partner/index.php _______________________________________________ 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:
- Rule opinions James Nonya (Jun 24)
- RE: Rule opinions Mike Feetham (Jun 24)
- RE: Rule opinions Mike Feetham (Jun 24)
- Re: Rule opinions Christian Kreibich (Jun 24)
- Re: Rule opinions James Nonya (Jun 24)
- <Possible follow-ups>
- RE: Rule opinions Grime, Richard S (Jun 24)
- RE: Rule opinions Kreimendahl, Chad J (Jun 24)
- Re: Rule opinions Gary Flynn (Jun 24)
- RE: Rule opinions James Nonya (Jun 25)
- RE: Rule opinions Mike Feetham (Jun 24)