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Ransom.Linux.KASSEIKA.A

March 06, 2024
 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

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.

  TECHNICAL DETAILS

File Size:

2,304,040 bytes

Memory Resident:

No

Initial Samples Received Date:

16 Dec 2023

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 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

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

18.886.05

FIRST VSAPI PATTERN DATE:

18 Dec 2023

VSAPI OPR PATTERN File:

18.887.00

VSAPI OPR PATTERN Date:

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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