Ransomware Research
Montserrat Ransomware
Montserrat is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on December 1, 2019, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: BaCkUp.
Quick Facts
- Ransomware Family
- Montserrat
- First Seen
- December 1, 2019
- Known Aliases
- BaCkUp
How Montserrat Ransomware Works
File Encryption Patterns
Montserrat modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..encrypted_backupRansom Note and Payment Demands
After encrypting files, Montserrat displays ransom notes demanding payment for file recovery:
How to restore data.htmlRansom message:
notes/How to restore data.html
Note locations:
EveryFolderTechnical Indicators
Associated Executable Files
The following executable files are associated with Montserrat ransomware:
Backup.exe
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About This Analysis
This Montserrat 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 Montserrat.
Last updated: July 30, 2025