W32/Filecoder_GandCrab.D!tr.ransom

Analysis

W32/Filecoder_GandCrab.D!tr.ransom is a generic detection for a Ransomware GANDCRAB 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):
  
  • KRAB-DECRYPT.txt : This file is txt file and will serve as ransom notes.
  • AVWYL-DECRYPT.html: This file is html file and will serve as ransom notes.


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


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


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


• This malware may connect to any of the following remote sites(s):
  
  • hxxp://www.billeri{Removed}.com
  • hxxp://www.macarte{Removed}.eu
  • hxxp://www.poke{Removed}.com
  • hxxp://perova{Removed}.ru
  • hxxp://asl-{Removed}.ru
  • hxxp://www.fabb{Removed}.gm
  • hxxp://www.perfectfunnel{Removed}.com
  • hxxp://www.wash-{Removed}.com
  • hxxp://al{Removed}.be
  • hxxp://ce{Removed}.net
  • hxxp://www.n2{Removed}.co.th
  • hxxp://www.rm{Removed}.in


• Below are illustrations of the Ransomware:
  

  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.