Analysis by: Neljorn Nathaniel Aguas
ALIASES:

UDS:Trojan-Ransom.Linux.Agent.a (KASPERSKY)

 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: 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 drops files as ransom note. It avoids encrypting files with the following file extensions.

  TECHNICAL DETAILS

File Size: 1,445,888 bytes
File Type: ELF
Memory Resident: No
Initial Samples Received Date: 28 Apr 2024
Payload: Encrypts files

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 accepts the following parameters:

  • {File Path}/{File Name} → Encrypts the specified file
  • {Directory Path} → Encrypts the specified directory recursively

Ransomware Routine

This Ransomware avoids encrypting files with the following strings in their file path:

  • /bin
  • /boot
  • /dev
  • /etc
  • /lib
  • /proc
  • /run
  • /sbin
  • /selinux
  • /sys
  • /usr/bin
  • /usr/src

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

  • .Ra_Lock

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

  • {Path to Encrypted File}\README_Howtorecover.txt

It avoids encrypting files with the following file extensions:

  • .Ra_Lock

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 19.308.02
FIRST VSAPI PATTERN DATE: 29 Apr 2024
VSAPI OPR PATTERN File: 19.309.00
VSAPI OPR PATTERN Date: 30 Apr 2024

Step 1

Trend Micro Predictive Machine Learning detects and blocks malware at the first sign of its existence, before it executes on your system. When enabled, your Trend Micro product detects this malware under the following machine learning name:

     
    • Troj.ELF.TRX.XXELFC1DFF042

Step 2

Scan your computer with your Trend Micro product to delete files detected as Ransom.Linux.RAWLD.THDBIBD. 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 3

Restore encrypted files from backup.


Did this description help? Tell us how we did.