Ransomware Research
MacAndChess Ransomware
MacAndChess is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on March 1, 2017, this ransomware has been actively targeting systems worldwide.
Quick Facts
- Ransomware Family
- MacAndChess
- First Seen
- March 1, 2017
How MacAndChess Ransomware Works
Targeted Files
Encrypts test folder on the Desktop Requires C&C to send data
File Encryption Patterns
MacAndChess modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..lockedRansom Note and Payment Demands
After encrypting files, MacAndChess displays ransom notes demanding payment for file recovery:
READ_IT.txtRansom message:
notes/READ_IT.txt
Note locations:
DesktopTechnical Indicators
Associated Executable Files
The following executable files are associated with MacAndChess ransomware:
MacAndChess.exe
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About This Analysis
This MacAndChess 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 MacAndChess.
Last updated: July 30, 2025