MSIL/Filecoder.PL!tr.ransom

Analysis

MSIL/Filecoder.PL!tr.ransom is a detection for a Ransomware Filecoder trojan, possibly targeting French Users.
Below are some of its observed characteristics/behaviours:

• This malware may drop any of the following file(s):
  
  • %UserProfile%\readme.txt : This text file will serve as ransom note.


• Affected files of this Ransomware will use the filenaming format {OriginalFilename.Ext}.enc.


• This Ransomware encrypts the files with the following file extensions:
  
  • .txt
  • .doc
  • .docx
  • .xls
  • .xlsx
  • .ppt
  • .pptx
  • .odt
  • .jpg
  • .png
  • .csv
  • .sql
  • .mdb
  • .sln
  • .php
  • .asp
  • .aspx
  • .html
  • .xml
  • .psd
  • .pdf
  • .odt
  • .swp


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

  Figure 1: Ransom note.

  
  

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.