1. Symantec/
  2. Security Response/
  3. Ransom.Cryptodefense


Risk Level 1: Very Low

March 26, 2014
September 1, 2016 10:03:46 AM
Infection Length:
Systems Affected:
Ransom.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.

Ransom.Cryptowall is a variant of Ransom.Cryptodefense.

For more information, see our blog:
The dawn of ransomwear: How ransomware could move to wearable devices

Note: Definitions prior to August, 2016 may detect Ransom.Cryptodefense as Trojan.Cryptodefense

Antivirus Protection Dates

  • Initial Rapid Release version March 26, 2014 revision 019
  • Latest Rapid Release version March 19, 2018 revision 041
  • Initial Daily Certified version March 26, 2014 revision 024
  • Latest Daily Certified version March 20, 2018 revision 003
  • Initial Weekly Certified release date April 2, 2014
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.
Writeup By: Mark Anthony Balanza

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STAR Antimalware Protection Technologies
2016 Internet Security Threat Report, Volume 21
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