Ransomware Research

ChernoLocker Ransomware

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

Quick facts

Ransomware Family
ChernoLocker
First Seen
December 1, 2019

How ChernoLocker ransomware works

File encryption patterns

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

Extensions added after encryption
.(.filelocker@protonmail.ch).(.CHERNOLOCKER)

Ransom note and payment demands

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

message
notes/note.txt
Location: OnceOnCompletion

Technical indicators

Associated executable files

The following executable files are associated with ChernoLocker ransomware:

Recovery and decryption tools

Decryption tools may be available for ChernoLocker. Review the resources below:

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About this analysis

This ChernoLocker 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 ChernoLocker.

Last updated: December 30, 2025

Detection coverage

Elastio detects ChernoLocker inside your data and backups.

The Hunt Engine uses Deep File Inspection to identify ChernoLocker 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 ChernoLocker Ransomware? | Elastio