W32.HLLW.Nulut

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Discovered:: August 22, 2003
Updated:: February 13, 2007 12:05:14 PM
Also Known As:: W32.HLLW.Malicou
Type:: Worm
Systems Affected:: Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows XP

W32.HLLW.Nulut is a worm that attempts to spread through file-sharing networks and email.

The existence of the file, "C:\Important.exe," is an indication of possible infection.

NOTE: Virus definitions dated prior to August 27, 2003 may detect this as W32.HLLW.Malicou.

Antivirus Protection Dates

Initial Rapid Release version August 25, 2003
Latest Rapid Release version September 28, 2010 revision 054
Initial Daily Certified version August 25, 2003
Latest Daily Certified version September 28, 2010 revision 036
Initial Weekly Certified release date August 27, 2003

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

Writeup By: Heather Shannon

Technical Details

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Internet Security Threat Report, Volume 16