W32.Blaster.B.Worm

W32.Blaster.B.Worm is a variant of W32.Blaster.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 it is not properly patched, the worm is not coded to replicate to those systems.

This worm attempts to download the penis32.exe file to the %WinDir%\System32 folder, and then execute it. This worm does not have any mass-mailing functionality.

Protection

• Initial Rapid Release version August 13, 2003
• Latest Rapid Release version July 12, 2008 revision 018
• Initial Daily Certified version August 13, 2003
• Latest Daily Certified version July 12, 2008 revision 019
• Initial Weekly Certified release date August 13, 2003

Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

Threat Assessment

Wild

• Wild Level: Low
• Number of Infections: 0 - 49
• Number of Sites: 0 - 2
• Geographical Distribution: Low
• Threat Containment: Easy
• Removal: Moderate

Damage

• Damage Level: Medium

Distribution

• Distribution Level: High