Ransomware Research

Deos Ransomware

Deos is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on May 1, 2017, this ransomware has been actively targeting systems worldwide.

Quick Facts

Ransomware Family
Deos
First Seen
May 1, 2017

How Deos Ransomware Works

File Encryption Patterns

Deos 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, Deos displays ransom notes demanding payment for file recovery:

message

Ransom message:

notes/note.txt

Note locations:

OnceOnCompletion

Technical Indicators

Associated Executable Files

The following executable files are associated with Deos ransomware:

  • Locker.exe

Elastio Can Help You

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About This Analysis

This Deos 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 Deos.

Last updated: July 30, 2025

Deos Ransomware - Detectable by Elastio