Analysis by: Clive Fuentebella
ALIASES:

Ransom:Linux/Sodinokibi.JJ (MICROSOFT)

 PLATFORM:

Linux

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Ransomware

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel: Dropped by other malware, Downloaded from the Internet

This Ransomware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It drops files as ransom note.

  TECHNICAL DETAILS

File Size: 105,232 bytes
File Type: ELF
Memory Resident: No
Payload: Displays graphics/image, Terminates VM processes

Arrival Details

This Ransomware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Other Details

This Ransomware does the following:

  • It terminates VM processes to ensure files are handled properly and to avoid file corruption.

It accepts the following parameters:

  • --path - Path to be encrypted (Default is current directory)
  • --silent (or -s) - Silently encrypt
  • --threads - Specify amount of threads to be created (Default is 50)

Ransomware Routine

This Ransomware appends the following extension to the file name of the encrypted files:

  • .rhkrc

It drops the following file(s) as ransom note:

  • {Encrypted path}\{Random string}-readme.txt

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 16.810.03
FIRST VSAPI PATTERN DATE: 29 Jun 2021
VSAPI OPR PATTERN File: 16.811.00
VSAPI OPR PATTERN Date: 30 Jun 2021

Step 1

Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.

Step 2

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Scan your computer with your Trend Micro product to delete files detected as Ransom.Linux.SODINOKIBI.THFBIBA. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check the following Trend Micro Support pages for more information:

Step 4

Restore encrypted files from backup.


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