Ransomware Research
DECAF Ransomware
DECAF is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on September 1, 2021, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: Winner.
Quick Facts
- Ransomware Family
- DECAF
- First Seen
- September 1, 2021
- Known Aliases
- Winner
How DECAF Ransomware Works
Targeted Files
98272cada9caf84c31d70fdc3705e95ef73cb4a5c507e2cf3caee1893a7a6f63 - correct run marker[0] -> DA DF EE DB AB ED EC AF
File Encryption Patterns
DECAF modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..decafRansom Note and Payment Demands
After encrypting files, DECAF displays ransom notes demanding payment for file recovery:
README.txtRansom message:
notes/README.txt
Note locations:
EveryFolderTechnical Indicators
Associated Executable Files
The following executable files are associated with DECAF ransomware:
installOLD.exeeng_unpack.exe
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About This Analysis
This DECAF 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 DECAF.
Last updated: July 30, 2025