W32.Dumaru@mm

W32.Dumaru@mm is a mass-mailing worm that drops an IRC Trojan onto an infected machine. The worm gathers email addresses from certain file types and uses its own SMTP engine to email itself.

The email has the following characteristics:

From: "Microsoft" <security@microsoft.com>
Subject: Use this patch immediately !
Message:
Dear friend , use this Internet Explorer patch now!
There are dangerous virus in the Internet now!
More than 500.000 already infected!
Attachment: patch.exe

The worm will also infect the exe files on NTFS partitions.

This threat is compressed with UPX.

Protection

• Initial Rapid Release version August 18, 2003
• Latest Rapid Release version August 20, 2008 revision 017
• Initial Daily Certified version August 18, 2003
• Latest Daily Certified version January 20, 2009 revision 048
• Initial Weekly Certified release date August 18, 2003

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

Threat Assessment

Wild

• Wild Level: Medium
• Number of Infections: More than 1000
• Number of Sites: More than 10
• Geographical Distribution: Low
• Threat Containment: Easy
• Removal: Moderate

Damage

• Damage Level: Medium

Distribution

• Distribution Level: High