Ransomware Research
CheckMate Ransomware
CheckMate is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on May 1, 2022, this ransomware has been actively targeting systems worldwide.
Quick Facts
- Ransomware Family
- CheckMate
- First Seen
- May 1, 2022
How CheckMate Ransomware Works
File Encryption Patterns
CheckMate modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..checkmateRansom Note and Payment Demands
After encrypting files, CheckMate displays ransom notes demanding payment for file recovery:
!CHECKMATE_DECRYPTION_READMERansom message:
notes/!CHECKMATE_DECRYPTION_README
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About This Analysis
This CheckMate 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 CheckMate.
Last updated: July 30, 2025