BitStak Ransomware
BitStak is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on July 1, 2016, this ransomware has been actively targeting systems worldwide.
Quick facts
How BitStak ransomware works
File encryption patterns
BitStak modifies encrypted files using specific patterns to mark them as encrypted:
Ransom note and payment demands
After encrypting files, BitStak displays ransom notes demanding payment for file recovery:
notes/note.txt
Recovery and decryption tools
Decryption tools may be available for BitStak. Review the resources below:
About this analysis
This BitStak 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 BitStak.
Last updated: December 30, 2025
Elastio detects BitStak inside your data and backups.
The Hunt Engine uses Deep File Inspection to identify BitStak 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.
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