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
How Jackalock ransomware works
File encryption patterns
Jackalock modifies encrypted files using specific patterns to mark them as encrypted:
Ransom note and payment demands
After encrypting files, Jackalock displays ransom notes demanding payment for file recovery:
notes/READ_NOTE.html
notes/output.png
About this analysis
This Jackalock 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 Jackalock.
Last updated: December 30, 2025
Elastio detects Jackalock inside your data and backups.
The Hunt Engine uses Deep File Inspection to identify Jackalock 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.
Recent ransomware
Explore other threats in our database