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  3. W32.HLLW.Lioten


Risk Level 2: Low

December 16, 2002
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]
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.

Antivirus Protection Dates

  • Initial Rapid Release version December 17, 2002
  • Latest Rapid Release version September 28, 2010 revision 054
  • Initial Daily Certified version December 17, 2002
  • Latest Daily Certified version September 28, 2010 revision 036
  • Initial Weekly Certified release date December 18, 2002
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

Threat Assessment


  • Wild Level: Low
  • Number of Infections: 50 - 999
  • Number of Sites: More than 10
  • Geographical Distribution: High
  • Threat Containment: Easy
  • Removal: Easy


  • Damage Level: Medium


  • Distribution Level: Medium
Writeup By: Jari Kytojoki

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