MSIL/FilecoderTeiv.B2F3!tr.ransom

Analysis

MSIL/FilecoderTeiv.B2F3!tr.ransom is a detection for a Ransomware trojan.
Below are some of its observed characteristics/behaviours:

• This malware displays a message prompt: “Congratulations, you've got Ransomware Nightmare!”, in Vietnamese Language.



Figure 1: Message Box.




Figure 2: Code.




• Below is the code indicating the target folders to encrypt, which is mainly User's Video folders.



Figure 3: Code.




• TBelow is the code indicating the target filetypes to encrypt..



Figure 4: Code. Below is the list of target files: .avi .mp4 .mp3 .flv .png .jpg .ico .doc .docx .xls .xlsx .ppt .pptx .pdf .zip .rar .7z



• Affected files of this Ransomware will use the filenaming format {original name}.nightmare.
  

  Figure 5: Code.

  
  

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.