W32/Streamer.GSBN!tr.ransom

Analysis

W32/Streamer.GSBN!tr.ransom is a generic detection for a Ransomware Streamer trojan. Since this is a generic detection, this malware may have varying behaviour.
Below are some of its observed characteristics/behaviours:

• Affected files of this Ransomware will use the filenaming format OriginalFileName.ext.neaeg, where italic strings are replaced.
• For every file that is encrypted, a ransom note is dropped with the filename OriginalFileName.ext.neaeg_readme, where italic strings are replaced.
• This malware was also observed to affect/encrypt files located on shared drives within the same subnet.
• This Ransomware may also attempt to delete Shadow Volume Copies.
• Affected victims of this Ransomware are redirected by the attacker via:
  • daisy.cardenas@protonmail.com
  • kiley.ball@tutanota.com
• Below is an illustration of the malware's Ransom notes:

  Figure 1: Ransom note.

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.