VRT Advisories

VRT Rules 2006-01-05

Sourcefire VRT Update

Date: 2006-01-05


The Sourcefire Vulnerability Research Team (VRT) has improved detection for the new Sober worm variant.


The Sober worm is a mass mailer normally spread via email. A variant of this worm displays more infection indicators that can be detected easily using rules.

Rules to detect machines infected with this variant of the sober worm are included in this update and are identified as sids 5320 and 5324.

Additionally, Sourcefire RNA customers can utilize the capabilities of their RNA applicance to detect infections.

Rule Pack Summary:

For a complete list of new and modified rules, click here.


Sourcefire VRT rule packs often utilize enhancements made to Snort. Operators should upgrade to the latest revision or patch level for Snort to ensure these enhancements are available before using these rules.

About the VRT:

The Sourcefire VRT is a group of leading edge intrusion detection and prevention experts working to proactively discover, assess and respond to the latest trends in hacking activity, intrusion attempts and vulnerabilities. This team is also supported by the vast resources of the open source Snort community, making it the largest group dedicated to advances in network security industry.