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  3. W32.Femot.Worm


Risk Level 2: Low

June 4, 2003
February 13, 2007 12:02:03 PM
Also Known As:
W32/MoFei.worm [McAfee], WORM_MOFEI.A [Trend], WORM_MOFEI.B [Trend], W32/Mofei-A [Sophos], Backdoor.Mofeir.101 [KAV], Worm.Win32.Mofeir.b [KAV], Win32.Mofei.A [CA], Win32.Mofei.B [CA]
Systems Affected:
Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows XP

W32.Femot.Worm is a worm that attempts to spread through a local network. The worm attempts to use ports 135 and 139. W32.Femot.Worm also has Backdoor capabilities.

Symantec Security Response has created a tool to remove W32.Femot.Worm, which is the easiest way to remove this threat.

Antivirus Protection Dates

  • Initial Rapid Release version June 4, 2003
  • Latest Rapid Release version June 24, 2014 revision 006
  • Initial Daily Certified version June 4, 2003
  • Latest Daily Certified version July 28, 2013 revision 020
  • Initial Weekly Certified release date June 4, 2003
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: Low
  • Threat Containment: Easy
  • Removal: Moderate


  • Damage Level: Medium


  • Distribution Level: Medium
Writeup By: Kaoru Hayashi

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