MSIL/FilecoderArgus.DB7A!tr.ransom

Analysis

MSIL/FilecoderArgus.DB7A!tr.ransom is a detection for a Ransomware trojan.
Below are some of its observed characteristics/behaviours:

• This malware has the capability to detect some debugging tools and stall execution of this malware if it finds these tools to be running.


• This malware may drop any of the following file(s):
  
  • "ARGUS-DECRYPT.html": This file is html file and will serve as ransom notes.
  • %Currentuser%\audiodg.exe : This is the utility sdelete.exe, the malware uses this to ensure that recovery of files are much more difficult.
  • %AppData%\Local\Temp\wallpaper.bmp: This file is a picture and will serve as ransom notes.


• This Ransomware also changes desktop background to ransom notes using %AppData%\Local\Temp\wallpaper.bmp.


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


• This malware may connect to any of the following remote sites(s):
  
  • hxxp:88.99.{Removed}.31
    


• Affected victims of this Ransomware are redirected by the attacker via:
  
  • argusdecrypt@cock.li
  • argusdecrypt@mailfence.com


• Below is an illustrations of this malware:
  

  Figure 1: Ransom notes.

  
  

Figure 2: Ransom notes.




Figure 3: AntiDebugging.

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.