Analysis by: Mohammed Malubay
ALIASES:

Ransom:Win64/Filecoder.DM!MTB(MICROSOFT);

 PLATFORM:

Windows

 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: 2,885,632 bytes
File Type: EXE
Initial Samples Received Date: 11 Feb 2021
Payload: Deletes files, Terminates processes, Connects to URLs/IPs, Encrypts files, Displays message/message boxes

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 adds the following processes:

  • %Public%\Music\clear.bat

(Note: %Public% is the folder that serves as a repository of files or folders common to all users, which is usually C:\Users\Public in Windows Vista, 7, and 8.)

Other System Modifications

This Ransomware deletes the following files:

  • %Public%\us.bat
  • %Public%\rdp.bat
  • %Public%\2008.exe
  • %Public%\ManuxP.exe

(Note: %Public% is the folder that serves as a repository of files or folders common to all users, which is usually C:\Users\Public in Windows Vista, 7, and 8.)

It deletes the following folders:

  • %System Root%\Users\Default\AppData
  • %Public%\AppData
  • %System Root%\Users\{User name}\AppData
  • {Encrypted Drive}:\$Recycle.Bin

(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.. %Public% is the folder that serves as a repository of files or folders common to all users, which is usually C:\Users\Public in Windows Vista, 7, and 8.)

Process Termination

This Ransomware terminates the following processes if found running in the affected system's memory:

  • sqlservr.exe
  • sqlceip.exe
  • sqlwriter.exe
  • 0xd.exe

Download Routine

This Ransomware accesses the following websites to download files:

  • http://{BLOCKED}.96.204.96/we_are_anon/vid.mp4
  • http://{BLOCKED}.96.204.96/we_are_anon/end.exe
  • http://{BLOCKED}.96.204.96/we_are_anon/clear.txt

It saves the files it downloads using the following names:

  • %Public%\Music\video.mp4
  • %Public%\Music\End.exe
  • %Public%\Music\clear.bat

(Note: %Public% is the folder that serves as a repository of files or folders common to all users, which is usually C:\Users\Public in Windows Vista, 7, and 8.)

Other Details

This Ransomware does the following:

  • Renames %System Root% to "Encrypted"
  • Renames other encrypted drives to "ENCRYPTED"

(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)

Ransomware Routine

This Ransomware appends the following extension to the file name of the encrypted files:

  • .Id-{10 random characters}.lucifer

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

  • {Encrypted Directory}:\HELP_DECRYPT_YOUR_FILES.html

It leaves text files that serve as ransom notes containing the following text:

  • {Encrypted Directory}:\HELP_DECRYPT_YOUR_FILES.txt

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 16.586.03
FIRST VSAPI PATTERN DATE: 10 Mar 2021
VSAPI OPR PATTERN File: 16.587.00
VSAPI OPR PATTERN Date: 11 Mar 2021

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.Win32.TRX.XXPE50FFF041

Step 2

Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.

Step 3

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 4

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.
  • %Public%\Music\video.mp4
  • %Public%\Music\End.exe
  • %Public%\Music\clear.bat
  • {Encrypted Directory}:\HELP_DECRYPT_YOUR_FILES.txt
  • {Encrypted Directory}:\HELP_DECRYPT_YOUR_FILES.html

Step 5

Scan your computer with your Trend Micro product to delete files detected as Ransom.Win64.LUCIFER.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 6

Restore encrypted files from backup.


Did this description help? Tell us how we did.