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  3. Trojan.Cryptodefense


Risk Level 1: Very Low

March 26, 2014
June 27, 2014 3:39:08 PM
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
Trojan.Cryptodefense is a Trojan horse that encrypts files on the compromised computer and then prompts the user to purchase a password in order to decrypt them.

Trojan.Cryptowall is a variant of Trojan.Cryptodefense.

Antivirus Protection Dates

  • Initial Rapid Release version March 26, 2014 revision 019
  • Latest Rapid Release version April 29, 2015 revision 049
  • Initial Daily Certified version March 26, 2014 revision 024
  • Latest Daily Certified version April 30, 2015 revision 002
  • Initial Weekly Certified release date April 2, 2014
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: Demands a ransom to decrypt files on the compromised computer.
  • Modifies Files: Encrypts 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: Mark Anthony Balanza

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