Ransomware Research
BoY Ransomware
BoY is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on January 1, 2023, this ransomware has been actively targeting systems worldwide.
Quick Facts
- Ransomware Family
- BoY
- First Seen
- January 1, 2023
How BoY Ransomware Works
Targeted Files
Skips first 6 bytes
File Encryption Patterns
BoY modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..BoYRansom Note and Payment Demands
After encrypting files, BoY displays ransom notes demanding payment for file recovery:
HOW TO DECRYPT FILES.txtRansom message:
notes/HOW TO DECRYPT FILES.txt
Note locations:
EveryFolderTechnical Indicators
Associated Executable Files
The following executable files are associated with BoY ransomware:
Mn537umi1f5exar.exe
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About This Analysis
This BoY 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 BoY.
Last updated: July 30, 2025