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  3. Trojan.Cryptolocker


Risk Level 1: Very Low

September 11, 2013
August 6, 2015 3:39:36 PM
Also Known As:
Trojan.Gpcoder.H [Symantec], CryptLocker.B [Norman], Trojan:Win32/Crilock.A [Microsoft], TROJ_CRILOCK.NS [Trend], Trojan.Ransomcrypt.F [Symantec]
Infection Length:
346,112 bytes
Systems Affected:
Windows 2000, Windows 7, Windows Server 2003, Windows Server 2008, Windows Vista, Windows XP
Trojan.Cryptolocker 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.

  • Virus definitions dated 11/13/2013 or earlier may detect this threat as Trojan.Ransomcrypt.F
  • Virus definitions dated 09/13/2013 or earlier may detect this threat as Trojan.Gpcoder.H

For more information, please see the following resources:

Antivirus Protection Dates

  • Initial Rapid Release version September 11, 2013 revision 022
  • Latest Rapid Release version August 18, 2015 revision 018
  • Initial Daily Certified version September 12, 2013 revision 001
  • Latest Daily Certified version August 18, 2015 revision 025
  • Initial Weekly Certified release date September 18, 2013
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.
Writeup By: Nino Fred P Gutierrez

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