Please note a critical security patch has been released out-of-cycle for Microsoft Products. 

Please patch ASAP.

Milw0rm POC: http://milw0rm.com/exploits/6824

Technical Analysis: http://blog.threatexpert.com/2008/10/gimmiva-exploits-zero-day-vulnerability.html

Reports of 7 Variantes at this time: http://blogs.authentium.com/virusblog/?p=284

Ensure you block the following at your Web Gateways:

Details relating to the Microsoft Code that is effected by the worm: http://www.phreedom.org/blog/2008/decompiling-ms08-067/

Snort Rules By Secureworks: http://www.emergingthreats.net/cgi-bin/cvsweb.cgi/sigs/EXPLOIT/EXPLOIT_MS08-067

Details on the Milw0rm POC: http://www.dontstuffbeansupyournose.com/?p=35

Regards,

Jason