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  3. W32.Yimfoca


Risk Level 1: Very Low

May 2, 2010
April 23, 2012 4:38:25 AM
Also Known As:
Troj/PushBot-U [Sophos]
Infection Length:
Systems Affected:
Windows 2000, Windows 7, Windows 95, Windows 98, Windows Me, Windows NT, Windows Server 2003, Windows Server 2008, Windows Vista, Windows XP
W32.Yimfoca is a worm that spreads by sending links through Yahoo! Messenger and displays surveys when popular websites are visited.

For more information, please see the following resources:
Blog entries on W32.Yimfoca

Antivirus Protection Dates

  • Initial Rapid Release version May 1, 2010 revision 034
  • Latest Rapid Release version January 27, 2015 revision 041
  • Initial Daily Certified version May 2, 2010 revision 005
  • Latest Daily Certified version January 28, 2015 revision 001
  • Initial Weekly Certified release date May 5, 2010
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

Threat Assessment


  • Wild Level: Low
  • Number of Infections: 0 - 49
  • Number of Sites: 0 - 2
  • Geographical Distribution: Low
  • Threat Containment: Easy
  • Removal: Easy


  • Damage Level: Low
  • Payload: May download additional malware


  • Distribution Level: Low
  • Ports: TCP port 2345
  • Target of Infection: Users of Yahoo! Messenger.
Note: On May 14, 2015, modifications will be made to the threat write-ups to streamline the content. The Threat Assessment section will no longer be published as this section is no longer relevant to today's threat landscape. The Risk Level will continue to be the main threat risk assessment indicator.
Writeup By: Mircea Ciubotariu

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