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:

..DEMON

Ransom Note and Payment Demands

After encrypting files, GAmmA displays ransom notes demanding payment for file recovery:

fileREADME.txt

Ransom message:

notes/README.txt

Note locations:

EveryFolder
message

Ransom message:

notes/note.txt

Note locations:

OnceOnCompletion

Technical Indicators

Associated Executable Files

The following executable files are associated with GAmmA ransomware:

  • Trojan.Ransom.BlackKingdom.exe
  • 2020-01-05 Gamma BlackKingdom.exe
  • Gamma BlackKingdom.exe
  • Cat22.exe
  • Client.exe
  • office82.exe
  • YCHIE9YN.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

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