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Ransom.Linux.DARKANGLE.A

March 29, 2024
 Analysis by: John Rainier Navato
 ALIASES:

Trojan-Ransom.DarkAngles (IKARUS)

 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

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:

157,024 bytes

File Type:

ELF

Memory Resident:

No

Initial Samples Received Date:

03 Oct 2023

Payload:

Drops files, 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.

Installation

This Ransomware drops the following files:

  • {Malware File Path}/{User Input} → the file dropped is wrkman.log by default but if the parameter -l is passed, the user input will be the file name used; contains log of actions done
  • {Malware File Path}/{User Input} → dropped if ran with the argument -s

Other Details

This Ransomware accepts the following parameters:

  • -m (10-20-25-33-50)
  • {Starting Path} → Starting directory to encrypt
  • -d → used to run program as daemon
  • -l → used to specify file name for log file (default is wrkman.log)
  • -s
  • -v → used to enable verbose logging

Ransomware Routine

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

  • .a
  • .so
  • .la
  • .o
  • .iso
  • .crypted
  • .README_TO_RESTORE

It avoids encrypting files found in the following folders:

  • /bin
  • /boot
  • /dev
  • /etc
  • /lost+found
  • /proc
  • /run
  • /sys
  • /usr
  • /usr/include
  • /usr/lib
  • /usr/lib32
  • /usr/lib64
  • /usr/libexec
  • /usr/sbin
  • /usr/share
  • /var/lib

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

  • .crypted

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

  • {Encrypted Path}/{Filename of Encrypted File}.{File Extension of Encrypted File}.crypted.README_TO_RESTORE

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

18.736.03

FIRST VSAPI PATTERN DATE:

04 Oct 2023

VSAPI OPR PATTERN File:

18.737.00

VSAPI OPR PATTERN Date:

05 Oct 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.XXELFC1DFF032

Step 2

Search and delete these files

[ Learn More ]
There may be some files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.  
  • {Malware File Path}/{User Input} → the file dropped is wrkman.log  by default but if the parameter -l is passed, the user input will be the file name used
  • {Malware File Path}/{User Input}

Step 3

Scan your computer with your Trend Micro product to delete files detected as Ransom.Linux.DARKANGLE.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 4

Restore encrypted files from backup.


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