Ransomware Research
DOOK Ransomware
DOOK is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on September 1, 2023, this ransomware has been actively targeting systems worldwide.
Quick Facts
- Ransomware Family
- DOOK
- First Seen
- September 1, 2023
How DOOK Ransomware Works
Targeted Files
Full extension -> .id-C63F241F.[Alexdec23@aol.com].DOOK
File Encryption Patterns
DOOK modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..DOOKRansom Note and Payment Demands
After encrypting files, DOOK displays ransom notes demanding payment for file recovery:
README!.txtRansom message:
notes/README!.txt
Note locations:
RootDiscsDesktopInfo.htaRansom message:
notes/Info.hta
Note locations:
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About This Analysis
This DOOK 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 DOOK.
Last updated: July 30, 2025