W32.HLLW.Nool@m

Risk Level 1: Very Low

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Discovered:: June 5, 2003
Updated:: February 13, 2007 12:02:23 PM
Type:: Worm
Systems Affected:: Windows 2000, Windows 95, Windows 98, Windows NT, Windows XP

W32.HLLW.Nool@m is a worm that attempts to spread itself through email. The worm replies to the first email it finds in Microsoft Outlook. The email will have a variable subject and attachment name. The attachment will have a double extension, the last of which will be either .com, .exe, .pif, or .scr.

The worm contains a Backdoor capability and it attempts to connect to a specified IRC channel on port 6667.

This threat is written in the Borland Delphi programming language.

Antivirus Protection Dates

Initial Rapid Release version June 5, 2003
Latest Rapid Release version September 28, 2010 revision 054
Initial Daily Certified version June 5, 2003
Latest Daily Certified version September 28, 2010 revision 036
Initial Weekly Certified release date June 5, 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: Moderate

Damage

Damage Level: Medium

Distribution

Distribution Level: Medium

Writeup By: Robert X Wang

Technical Details

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Internet Security Threat Report, Volume 16