VRT Advisories

VRT Rules 2008-07-11

Sourcefire VRT Rules Update

Date: 2008-07-11


This release contains a fix for a problem that caused the rule for MS08-037 to generate false positive events. This release also contains multiple rules in the spyware-put and backdoor categories to provide coverage for emerging spyware and backdoor threats.


Microsoft Security Advisory (MS08-037):
Microsoft Windows DNS client and server are prone to a DNS spoofing vulnerability that may allow an attacker to redirect network traffic.

A rule to detect attacks targeting this vulnerability was previously released. A modified version that reduces false positive events is included in this release and is identified with GID 3 and SID 13887.

As a result of ongoing research, the Sourcefire VRT has added multiple rules to the spyware-put and backdoor rule sets to provide coverage for emerging threats from these technologies.

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 the network security industry.