MSIL/BlackRuby.CC3E!tr.ransom

Analysis

MSIL/BlackRuby.CC3E!tr.ransom is a detection for a Black Ruby Ransomware trojan.
Below are some of its observed characteristics/behaviours:

• This malware may drop any of the following file(s):
  
  • HOW-TO-DECRYPT-FILES.txt: This file is a txt file and will serve as ransom notes. It will be dropped in every affected folder.


• Affected files of this Ransomware will use the prepending filenaming format as Encrypted_{Random}.BlackRubyLight.


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


• After executing this malware, it may delete itself.


• The malware will try to download strings from the following url, but this url has already been removed.


• hxxp://geoip.nek{Removed}.com/api


• Below is a sample illustration of the Ransom notes:
  

  Figure 1: 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.