Ransomware Research

Jackalock Ransomware

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

Quick Facts

Ransomware Family
Jackalock
First Seen
April 1, 2025

How Jackalock Ransomware Works

File Encryption Patterns

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

File extensions added after encryption:

..jackalock

Ransom Note and Payment Demands

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

fileREAD_NOTE.html

Ransom message:

notes/READ_NOTE.html

Note locations:

EveryFolder
screenshot

Ransom message:

notes/output.png

Note locations:

Desktop

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About This Analysis

This Jackalock 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 Jackalock.

Last updated: October 30, 2025

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