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  3. Trojan.Xrupter


Risk Level 1: Very Low

March 22, 2009
March 22, 2009 10:12:28 AM
Also Known As:
Ransom-F [McAfee], Troj/Fakecor-A [Sophos], W32/Fixer [F-Secure]
Infection Length:
139,264 and 94,208 bytes
Systems Affected:
Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows Server 2003, Windows Vista, Windows XP
Trojan.Xrupter is a Trojan horse that encrypts files on the compromised computer.

For more information, please read the following:
An Offer Too Good to Refuse, Courtesy of Vundo

Antivirus Protection Dates

  • Initial Rapid Release version March 22, 2009 revision 001
  • Latest Rapid Release version September 28, 2010 revision 054
  • Initial Daily Certified version March 22, 2009 revision 005
  • Latest Daily Certified version September 28, 2010 revision 036
  • Initial Weekly Certified release date March 25, 2009
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: Moderate


  • Damage Level: Medium
  • Payload: Downloads a program on to the compromised computer.
  • Modifies Files: Encrypts certain files on the compromised computer.


  • Distribution Level: Low
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: Takayoshi Nakayama

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