Analysis by: Raymart Christian Yambot
 PLATFORM:

Linux

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

  • Threat Type: Ransomware

  • Destructiveness: No

  • Encrypted:

  • 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.

  TECHNICAL DETAILS

Tamaño del archivo 2,304,040 bytes
Residente en memoria No
Fecha de recepción de las muestras iniciales 16 Dec 2023
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 does the following:

  • It does not append an extension to the encrypted files.

It accepts the following parameters:

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

Ransomware Routine

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

  • RestoreFilesReadMe.txt
  • config.fish
  • .bashrc
  • .zshrc
  • .cshrc
  • .tcshrc
  • .kshrc
  • .tcshrc

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

  • bin
  • boot
  • dev
  • etc
  • lib
  • lib32
  • lib64
  • libx32
  • lost+found
  • opt
  • proc
  • run
  • sbin
  • selinux
  • snap
  • srv
  • sys
  • tmp
  • usr
  • initrd.img
  • vmlinuz
  • cdrom
  • kernel
  • devices
  • platform
  • system
  • vol
  • rpool
  • zvboot

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

  • RestoreFilesReadMe.txt

  SOLUTION

Motor de exploración mínimo 9.800
Primer archivo de patrones de VSAPI 18.886.05
Primera fecha de publicación de patrones de VSAPI 18 Dec 2023
Versión de patrones OPR de VSAPI 18.887.00
Fecha de publicación de patrones OPR de VSAPI 19 Dec 2023

Step 1

Scan your computer with your Trend Micro product to delete files detected as Ransom.Linux.KASSEIKA.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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