Ransomware Research

OnyxLocker Ransomware

OnyxLocker is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on October 1, 2019, this ransomware has been actively targeting systems worldwide.

Quick facts

Ransomware Family
OnyxLocker
First Seen
October 1, 2019

How OnyxLocker ransomware works

File encryption patterns

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

Extensions added after encryption
.onx

Ransom note and payment demands

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

file/^RECOVERY INSTRUCTIONS [0-9]{1} \.txt$/
Location: Desktop
file/^Read-me!!! [0-9]{1,2} \.txt$/
notes/Read-me!!! 10 .txt
Location: Desktop
file/^Прочти меня! [0-9]{1} \.txt$/
notes/Прочти меня! 0 .txt
Location: Desktop

Technical indicators

Associated executable files

The following executable files are associated with OnyxLocker ransomware:

About this analysis

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

Last updated: December 30, 2025

Detection coverage

Elastio detects OnyxLocker inside your data and backups.

The Hunt Engine uses Deep File Inspection to identify OnyxLocker across live data, replicated data, and backups. If this family is in your environment, Elastio finds it before encryption completes. Run a scan against your recovery points to confirm.

See How the Hunt Engine WorksRequest a Demo

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What is OnyxLocker Ransomware? | Elastio