Ransomware Research

Louis Ransomware

Louis is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on March 1, 2025, this ransomware has been actively targeting systems worldwide.

Quick Facts

Ransomware Family
Louis
First Seen
March 1, 2025

How Louis Ransomware Works

File Encryption Patterns

Louis modifies encrypted files using specific patterns to mark them as encrypted:

File extensions added after encryption:

..Louis

Ransom Note and Payment Demands

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

fileLouis_Help.txt

Ransom message:

notes/Louis_Help.txt

Note locations:

EveryFolder
screenshot

Ransom message:

notes/1.png

Note locations:

Desktop

Technical Indicators

Associated Executable Files

The following executable files are associated with Louis ransomware:

  • focx.exe.noejecutar

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About This Analysis

This Louis 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 Louis.

Last updated: October 30, 2025

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