Discovered: December 16, 2002
Updated: February 13, 2007 11:41:35 AM
Also Known As: W32/Lioten.worm [McAfee], Win32.Lioten [CA], WORM_LIOTEN.A [Trend], W32/Lioten-A [Sophos], Worm.Win32.Lioten [KAV]
Type: Worm
Systems Affected: Windows 2000, Windows XP
W32.HLLW.Lioten is a simple worm that attempts to copy itself over Windows NT-based networks. The worm is written in the Visual C programming language and is packed with UPX.
When attempting to find machines to infect, it will query machines on port 445.
By default, installations of Windows NT 4 do not listen on port 445, whereas Windows 2000 and Windows XP installations do listen on port 445.
Protection
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Initial Rapid Release version December 17, 2002
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Latest Rapid Release version March 3, 2008 revision 035
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Initial Daily Certified version December 17, 2002
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Latest Daily Certified version March 3, 2008 revision 037
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Initial Weekly Certified release date December 18, 2002
Click for a more detailed description of Rapid Release and Daily Certified virus definitions.
Threat Assessment
Wild
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Wild Level: Low
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Number of Infections: 50 - 999
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Number of Sites: More than 10
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Geographical Distribution: High
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Threat Containment: Easy
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Removal: Easy
Damage
Distribution
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Distribution Level: Medium
Writeup By: Jari Kytojoki
