W32.Blaster.Worm is a worm that exploits the DCOM RPC vulnerability (first described in Microsoft Security Bulletin MS03-026)(users are recommended to patch this vulnerability by applying Microsoft Security Bulletin MS03-039) 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