Analysis by: Mc Justine De Guzman
 PLATFORM:

Linux

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

  • Threat Type: Ransomware

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

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

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 encrypts files with specific file extensions. It drops files as ransom note.

  TECHNICAL DETAILS

File Size: 67,000 bytes
File Type: ELF
Memory Resident: No
Initial Samples Received Date: 26 Apr 2022
Payload: Encrypts files, Displays message/message boxes

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 requires to be executed together with the directory to be encrypted as its parameter
  • It shuts down Virtual Machines

Ransomware Routine

This Ransomware encrypts files with the following extensions:

  • .log
  • .vmdk
  • .vmem
  • .vswp
  • .vmsn

It appends the following extension to the file name of the encrypted files:

  • .Cheers

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

  • {Encrypted directory}\How to Restore Your Files.txt

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 17.528.07
FIRST VSAPI PATTERN DATE: 26 Apr 2022
VSAPI OPR PATTERN File: 17.529.00
VSAPI OPR PATTERN Date: 27 Apr 2022

Step 1

Scan your computer with your Trend Micro product to delete files detected as Ransom.Linux.CHEERSCRYPT.A. 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 2

Restore encrypted files from backup.


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