Ransomware Research

MM Locker Ransomware

MM Locker is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on June 1, 2016, this ransomware has been actively targeting systems worldwide.

Quick Facts

Ransomware Family
MM Locker
First Seen
June 1, 2016

How MM Locker Ransomware Works

Targeted Files

NOSAMPLE

File Encryption Patterns

MM Locker modifies encrypted files using specific patterns to mark them as encrypted:

File extensions added after encryption:

..locked

Ransom Note and Payment Demands

After encrypting files, MM Locker displays ransom notes demanding payment for file recovery:

fileREAD_IT.txt

Ransom message:

notes/READ_IT.txt

Note locations:

Desktop
screenshot

Ransom message:

notes/wal-note.jpg

Note locations:

Desktop

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About This Analysis

This MM Locker ransomware analysis is part of Elastio's comprehensive ransomware detection database. Elastio provides advanced ransomware protection and recovery solutions, helping organizations defend against and recover from ransomware attacks like MM Locker.

Last updated: July 30, 2025