W32.Dumaru.B@mm

Risk Level 2: Low

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Discovered:: August 20, 2003
Updated:: February 13, 2007 12:05:21 PM
Type:: Worm
Systems Affected:: Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows XP

W32.Dumaru.B@mm is a mass-mailing worm that drops an IRC Trojan onto an infected computer. 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

W32.Dumaru.B@mm will also infect the .exe files on NTFS partitions.

The worm will listen on ports:

TCP 10000
TCP 1001
TCP 2283

And, the worm logs the keystrokes and sends the data to a specified email address.

On September 2, 2003, virus definitions were updated to detect minor variants of this worm.

Antivirus Protection Dates

Initial Rapid Release version August 21, 2003
Latest Rapid Release version September 28, 2010 revision 054
Initial Daily Certified version August 21, 2003
Latest Daily Certified version September 28, 2010 revision 036
Initial Weekly Certified release date August 21, 2003

Click 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: Easy

Damage

Damage Level: Medium

Distribution

Distribution Level: High

Writeup By: Douglas Knowles

Technical Details

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Internet Security Threat Report, Volume 16