Ransomware Research
Reopen Ransomware
Reopen is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on March 1, 2023, this ransomware has been actively targeting systems worldwide.
Quick Facts
- Ransomware Family
- Reopen
- First Seen
- March 1, 2023
How Reopen Ransomware Works
File Encryption Patterns
Reopen modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..reopenRansom Note and Payment Demands
After encrypting files, Reopen displays ransom notes demanding payment for file recovery:
INFORMATION.txtRansom message:
notes/INFORMATION.txt
Note locations:
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About This Analysis
This Reopen 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 Reopen.
Last updated: October 30, 2025
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