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  3. Backdoor.Cycbot


Risk Level 1: Very Low

October 30, 2010
November 3, 2010 2:49:53 AM
Also Known As:
Troj/Agent-PEW [Sophos], Troj/Agent-PFM [Sophos], Troj/FakeAv-BWP [Sophos], Troj/Agent-PIP [Sophos], Troj/DwnLdr-IPT [Sophos], Troj/FakeAV-BZD [Sophos], Troj/Cycbot-B [Sophos], Troj/FakeDpr-A [Sophos], Troj/Agent-PKI [Sophos], Troj/Agent-PKJ [Sophos], Troj/Agent-PKH [Sophos], Troj/Mdrop-DBD [Sophos], Troj/Agent-PLE [Sophos], Troj/FakeAV-CAL [Sophos], Troj/FakeAV-CAK [Sophos], Troj/Proxy-JY [Sophos], Troj/FakeAV-CAW [Sophos], Troj/FakeAV-CAV [Sophos], Troj/FakeAV-CAX [Sophos], Troj/FakeAV-CBU [Sophos], Troj/FakeAV-CDG [Sophos], Troj/Katusha-J [Sophos]
Infection Length:
105,472 bytes
Systems Affected:
Windows 2000, Windows 7, Windows 95, Windows 98, Windows Me, Windows NT, Windows Server 2003, Windows Server 2008, Windows Vista, Windows XP
Backdoor.Cycbot is a Trojan horse that opens a back door on the compromised computer.

For more information, please see the following resources:
Blogs relating to Backdoor.Cycbot

Antivirus Protection Dates

  • Initial Rapid Release version October 30, 2010 revision 002
  • Latest Rapid Release version March 28, 2015 revision 019
  • Initial Daily Certified version pending
  • Latest Daily Certified version March 23, 2015 revision 009
  • Initial Weekly Certified release date November 3, 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: Medium
  • Payload: Sets up a local proxy and opens a back door.


  • Distribution Level: Low
Writeup By: Nino Fred Gutierrez, Kazumasa Itabashi, and Eoin Ward

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