Ransomware Research

Javalocker Ransomware

Javalocker is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on March 1, 2020, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: JavaEncrypt.

Quick facts

Ransomware Family
Javalocker
First Seen
March 1, 2020
Known Aliases
  • JavaEncrypt

How Javalocker ransomware works

File modification behavior

Javalocker updates file modification timestamps after encryption.

File encryption patterns

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

Extensions added after encryption
  • .javaencrypt

Ransom note and payment demands

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

filereadmeonnotepad.javaencrypt
notes/readmeonnotepad.javaencrypt

Location: EveryFolder

Technical indicators

Associated executable files

The following executable files are associated with Javalocker ransomware:

  • 14370-0db8a7d767a2454998bf3ee875676929.jar
  • JAVABASIC.jar
  • 14369-f23a33a6934441ef00510f62d691b104.jar
  • 14632-f0a2f76a1250d3c586dca4b754558d1a.jar
  • 2.jar

About this analysis

This Javalocker 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 Javalocker.

Last updated: October 31, 2022

Detection coverage

Elastio detects Javalocker inside your data and backups.

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