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Ransom.Linux.CELANCYC.THCCABC

May 25, 2023
 Analysis by: Jeffrey Francis Bonaobra
 ALIASES:

Trojan.Ransom.Cylance.B (BITDEFENDER), Ransom:Linux/Babuk.E!MTB (BABUK)

 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.

  TECHNICAL DETAILS

File Size:

1,089,048 bytes

File Type:

ELF

Memory Resident:

No

Initial Samples Received Date:

31 Mar 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 creates a specified number of threads depending on the number of processors of the infected machine.
  • It displays the following if no parameter is provided:
  • It displays the following on the terminal when encrypting files:

It accepts the following parameters:

  • {path to encrypt} → required to proceed to its encryption routine

Ransomware Routine

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

  • CYLANCE_README.txt
  • .Cylance

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

  • {Original File Name}.{Original File Extension}.Cylance

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

  • CYLANCE_README.txt

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

18.352.09

FIRST VSAPI PATTERN DATE:

31 Mar 2023

VSAPI OPR PATTERN File:

18.353.00

VSAPI OPR PATTERN Date:

01 Apr 2023

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.XXELFC1DFF028

Step 2

Scan your computer with your Trend Micro product to delete files detected as Ransom.Linux.CELANCYC.THCCABC. 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:


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