Ransomware Research
Cooper Ransomware
Cooper 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
- Cooper
- First Seen
- March 1, 2023
How Cooper Ransomware Works
Targeted Files
NOSAMPLE https://www.bleepingcomputer.com/forums/t/783907/cooper-ransomware-cooper-support-topic/
File Encryption Patterns
Cooper modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..CooperRansom Note and Payment Demands
After encrypting files, Cooper displays ransom notes demanding payment for file recovery:
Cooper_Recover.txtRansom message:
notes/Cooper_Recover.txt
Elastio Can Help You
Don't let Cooper ransomware take over your data
Elastio provides advanced ransomware protection and recovery solutions to keep your organization safe.
About This Analysis
This Cooper 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 Cooper.
Last updated: July 30, 2025