W32/FilecoderProt.F183!tr.ransom

Analysis

W32/FilecoderProt.F183!tr.ransom is a detection for a Ransomware trojan.
Below are some of its observed characteristics/behaviours:

• This malware may drop any of the following file(s):
  
  • RESTORE_FILES.txt: This text file will serve as ransom notes. It is dropped to every infected folder.
  • HOW_TO_RESTORE_YOUR_FILES.txt : This text file will serve as ransom note. It is dropped to every infected folder.


• This malware was also observed to affect/encrypt files located on shared drive within the same subnet.


• Affected files of this Ransomware will use the prepending filenaming format as {Originalname.Ext}.protected.


• Affected victims of this Ransomware are redirected by the attacker via:
  
  • secureserver@memeware.net


• It deletes the shadow volume copies so that the user cannot restore them.


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

  Figure 1: Ransom notes.

  
  

  Figure 2 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.