download the file above, heres a little info on it.
W32.Blaster.Worm is a worm that exploits the DCOM RPC vulnerability (described in Microsoft Security Bulletin MS03-026) using TCP port 135. The worm targets only Windows 2000 and Windows XP machines. While Windows NT and Windows 2003 Server machines are vulnerable to the aforementioned exploit (if not properly patched), the worm is not coded to replicate to those systems. This worm attempts to download the msblast.exe file to the %WinDir%\system32 directory and then execute it. W32.Blaster.Worm does not have a mass-mailing functionality.
Additional information and an alternate site from which to download the Microsoft patch is available in the Microsoft article, "What You Should Know About the Blaster Worm and Its Variants."
We recommend that you block access to TCP port 4444 at the firewall level, and then block the following ports, if you do not use the following applications:
* TCP Port 135, "DCOM RPC"
* UDP Port 69, "TFTP"
The worm also attempts to perform a Denial of Service (DoS) on the Microsoft Windows Update Web server (windowsupdate.com). This is an attempt to prevent you from applying a patch on your computer against the DCOM RPC vulnerability.