As of a few moments ago the Executive Summary included your information Executive Summary: A worm has started spreading early afternoon EDT (evening UTC Time) and is expected to continue spreading rapidly. This worms exploits the Microsoft Windows DCOM RPC Vulnerability announced July 16, 2003. The SANS Institute, and Incidents.org recommends the following Action Items: * Close port 135/tcp (and if possible 135-139, 445 and 593) * Monitor TCP Port 4444 and UDP Port 69 (tftp) which are used by the worm for activity related to this worm. * Ensure that all available patches have been applied, especially the patches reported in Microsoft Security Bulletin MS03-026. * This bulletin is available at http://www.microsoft.com/technet/security/bulletin/MS03-026.asp * Infected machines are recommended to be pulled from the network pending a complete rebuild of the system. Scott Fendley --- Scott Fendley scottf@uark.edu Systems/Security Analyst (479) 575-2022 University of Arkansas (479) 575-4753 fax On Mon, 11 Aug 2003, Stewart, William C (Bill), RTSLS wrote:

According to http://isc.sans.org/diary.html?date=2003-08-11 , the worm uses the latest popular MS exploit ports, so " * Close port 135/tcp (and if possible 135-139, 445 and 593) ".

It also uses TCP port 4444 and TFTP = UDP 69 to download its attack code after getting the initial bootstrap infection. So you probably want to be blocking TCP 4444 and (if appropriate, which it usually is, TFTP), and tracing any 4444 activity and TFTPs to detect attacks.