Snort mailing list archives
Re: Elkern Worm
From: "Kenneth G. Arnold" <bkarnold () cbu edu>
Date: Tue, 27 May 2003 13:46:13 -0500
I was under the impression that Elkern was caused by Klez. Any machines that I found infected with Klez also had Elkern. It may also be possible to become infected with Elkern independently.
Symantec says:NOTE: This virus is associated with and can be dropped by either W32.Klez.A or W32.Klez.D. Please read those write-ups for additional information.
I have determined a way to detect a machine infected with Klez. Infected machines try to send email using various mailservers. One of them is 25.0.0.0 so:
alert tcp $HOME_NET any -> 25.0.0.0/32 25 (msg:"Klez infection likely"; flags:S;)
would find machines trying to send email using that particular server. Every machine setting off this alert has been infected with Klez There may be other machines infected that don't use this particular address.
As far as finding out which machines are not current with their virus definitions, you could set up an alert to fire when a machine connects to the source of the virus definitions. A machine that did not set off the alert is not getting current virus definitions. I know this is alerting on a good thing rather than a bad thing but it is a possible way to determine which machines are not updating virus definitions.
Ken At 02:06 PM 5/27/2003 -0400, Lorraine Cannavale wrote:
I just sent an e-mail to the snort-sigs list seeking a rule or ruleset to detect the Elkern worm (if anyone in this group has the rule, your response is welcome). But, I would really like some tips and advice on controlling the Elkern worm on our network. We have antivirus software installed on each workstation, and it should be configured to obtain the latest virus definitions daily. However, we do not have an accurate way (today) of determining if workstations do in fact have the latest AV signatures, nor do we have a way of determining what workstations may be infected with viruses. Our shared folders on servers keep getting re-infected with the Elkern virus. Any help and suggestions would be appreciated. Thank you in advance, Lorraine . ------------------------------------------------------- This SF.net email is sponsored by: ObjectStore. If flattening out C++ or Java code to make your application fit in a relational database is painful, don't do it! Check out ObjectStore. Now part of Progress Software. http://www.objectstore.net/sourceforge _______________________________________________ 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 is sponsored by: ObjectStore. If flattening out C++ or Java code to make your application fit in a relational database is painful, don't do it! Check out ObjectStore. Now part of Progress Software. http://www.objectstore.net/sourceforge _______________________________________________ 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:
- Elkern Worm Lorraine Cannavale (May 27)
- Re: Elkern Worm Terence Runge (May 27)
- <Possible follow-ups>
- Re: Elkern Worm Kenneth G. Arnold (May 27)