FAST Ransomware
FAST is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on May 1, 2023, this ransomware has been actively targeting systems worldwide.
Quick facts
How FAST ransomware works
File encryption patterns
FAST modifies encrypted files using specific patterns to mark them as encrypted:
Ransom note and payment demands
After encrypting files, FAST displays ransom notes demanding payment for file recovery:
notes/#FILEENCRYPTED.txt
About this analysis
This FAST 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 FAST.
Last updated: December 30, 2025
Elastio detects FAST inside your data and backups.
The Hunt Engine uses Deep File Inspection to identify FAST 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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