W32/DelShad.AK!tr.ransom

Analysis

W32/DelShad.AK!tr.ransom is a generic detection for a Russian Ransomware DelShad 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):
  • %Desktop%\как расшифровать файлы.txt : This is a text file and will serve as ransom notes.
  ** как расшифровать файлы translates to "how to decrypt files".
• Affected files of this Ransomware will use the filenaming format файл зашифрован (OriginalFileName.ext) .wannacash.
** файл зашифрован translates to "file is encrypted".
• Affected victims of this Ransomware are redirected by the attacker via:
  • crypto_wannacash@protonmail.com
• Below is an illustration of the malware's 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.