MSIL/Crypren.FA2A!tr.ransom

Analysis

MSIL/Crypren.FA2A!tr.ransom is a generic detection for a Ransomware Crypren trojan. Since this is a generic detection, this malware may have varying behaviour.
Below are some of its observed characteristics/behaviours:

• This malware may drop any of the following file(s):
  
  • %Desktop%\#DECRYPT MY FILES#.txt : This file is dropped on the affected hosts and will serve as ransom notes.


• Affected files of this Ransomware will use any of the following filenaming format:
  
  • {OriginalFileName}.[fileslocker@pm.me]
  • {OriginalFileName}.locked


• Affected victims of this Ransomware are redirected by the attacker via:
  
  • bakfiles@protonmail.com
  • fileslocker@pm.me


• Below is an illustration of the malware's Ransom notes:
  

  Figure 1: Ransom notes.

  
  

  Figure 2: Ransom notes.

  
  

  Figure 3: Ransom notes.

Recommended Action

• Make sure that your FortiGate/FortiClient system is using the latest AV database.
• Quarantine/delete files that are detected and replace infected files with clean backup copies.