Ransom.Win64.METAENCRYPTOR.A

 Analysis by: Leidryn Saludez

 ALIASES:

Ransom:Win64/MetaEncryptor.SA!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:

Dropped by other malware, Downloaded from the Internet


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:

1,391,104 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

10 Feb 2025

Payload:

Collects system information, Disables AV, 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.

Process Termination

This Ransomware terminates the following services if found on the affected system:

  • Firebird
  • MSSQL
  • SQL
  • Exchange
  • wsbex
  • postgresql
  • BACKP
  • tomcat
  • SBS
  • SharePoint

Information Theft

This Ransomware gathers the following data:

  • Total Memory
  • Used Memory
  • System Name
  • Kernel Version
  • OS Version
  • System Host Name
  • CPU

Other Details

This Ransomware accepts the following parameters:

  • USAGE:
    • {Malware Filename} [FLAGS]
    • {Malware Filename} [OPTIONS]
  • FLAGS:
    • -h | --help → Prints help information
    • -V | --version → Prints version information
  • OPTIONS:
    • -d | --debug → Debug mode, more verbose output [default: false]
    • --disable-shares → Do not encrypt SMB shares [default: false]
    • -e | --exclude {file path} → Exclude specific file for encryption
    • --fast → Activate FAST mode [default: false]
    • -f | --only-files {file} → Encrypts the specified file
    • -k | --kill-processes → Terminates all non-windows processes. [default: false]
    • --no-sort-files → Sort files by date
    • --only-wait → Only wait, do nothing. for debug purposes. [default: false]
    • -p | --paths → Encrypts specified directory
    • --raise-privs → Execute with admin privilege [default: true]
    • --no-vss → Do not remove Volume Shadow Copies [default: true]
    • --shred-at-end → Delete itself after encryption [default: false]
    • --shred-now → Delete itself immediately [default: false]
    • -t | --threads → Threads count, by default selecting by number of CPU cores [default: 0]
    • --wait-mm → Time delay in minutes [default: 0]

Ransomware Routine

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

  • .metaencrypted

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

  • {Encrypted Directory}\!metaencrypter.txt

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

19.906.03

FIRST VSAPI PATTERN DATE:

17 Feb 2025

VSAPI OPR PATTERN File:

19.907.00

VSAPI OPR PATTERN Date:

18 Feb 2025

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.XXPE50FFF090

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 the files detected as Ransom.Win64.METAENCRYPTOR.A <p><b>*Note:</b> Some component files may be hidden. Please make sure you check the <i>Search Hidden Files and Folders</i> checkbox in the <i>More advanced options</i> option to include all hidden files and folders in the search result.</p>

<!-- ########## Addressing Registry Shell Spawning ########## --> <p><i>To stop the malware/grayware from running when certain files are opened:</i></p> <p>For Windows 7, Windows Server 2008 (R2), Windows 8, Windows 8.1, Windows 10, and Windows Server 2012 (R2):</p> <ol> <li>Open a Windows Explorer window.<ul><li><i>For Windows 7 and Server 2008 (R2) users,</i> click <i>Start>Computer</i>.</li> <li><i>For Windows 8, 8.1, 10, and Server 2012 (R2) users,</i> right-click on the lower left corner of the screen,then click <i>File Explorer</i>.</li></ul> </li> <li>In the <i>Search Computer/This PC</i> input box, type the name of the file that was detected earlier.</li> <li>Once located, select the file then press <i>SHIFT+DELETE</i> to delete it. <br> <b>*Note:</b> Read the <a href="https://support.microsoft.com/en-us/help/977380/the-search-programs-and-files-box-does-not-display-search-results-corr" target="_blank">following Microsoft page</a> if these steps do not work on Windows 7 or Windows Server 2008 (R2).</li> </ol>

Step 5

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


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