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

Canal de infección 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

Tamaño del archivo 1,445,888 bytes
Tipo de archivo ELF
Residente en memoria No
Fecha de recepción de las muestras iniciales 28 Apr 2024
Carga útil 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

Motor de exploración mínimo 9.800
Primer archivo de patrones de VSAPI 19.308.02
Primera fecha de publicación de patrones de VSAPI 29 Apr 2024
Versión de patrones OPR de VSAPI 19.309.00
Fecha de publicación de patrones OPR de VSAPI 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.


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