Ransomware Research
GAmmA Ransomware
GAmmA is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on May 1, 2020, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: Cat22, GAmmAWare.
Quick Facts
- Ransomware Family
- GAmmA
- First Seen
- May 1, 2020
- Known Aliases
- Cat22GAmmAWare
How GAmmA Ransomware Works
Targeted Files
Encrypts files in UserFolders only
File Encryption Patterns
GAmmA modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..DEMONRansom Note and Payment Demands
After encrypting files, GAmmA displays ransom notes demanding payment for file recovery:
README.txtRansom message:
notes/README.txt
Note locations:
EveryFolderRansom message:
notes/note.txt
Note locations:
OnceOnCompletionTechnical Indicators
Associated Executable Files
The following executable files are associated with GAmmA ransomware:
Trojan.Ransom.BlackKingdom.exe2020-01-05 Gamma BlackKingdom.exeGamma BlackKingdom.exeCat22.exeClient.exeoffice82.exeYCHIE9YN.exe
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About This Analysis
This GAmmA 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 GAmmA.
Last updated: July 30, 2025