Ransomware Research
BlueCheeser Ransomware
BlueCheeser is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on January 1, 2020, this ransomware has been actively targeting systems worldwide.
Quick Facts
- Ransomware Family
- BlueCheeser
- First Seen
- January 1, 2020
How BlueCheeser Ransomware Works
Targeted Files
Encrypts Desktop files only (no recursive)
File Encryption Patterns
BlueCheeser modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..himrRansom Note and Payment Demands
After encrypting files, BlueCheeser displays ransom notes demanding payment for file recovery:
Instructions.txtRansom message:
notes/Instructions.txt
Note locations:
DesktopTechnical Indicators
Associated Executable Files
The following executable files are associated with BlueCheeser ransomware:
BlueCheeser.exe
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About This Analysis
This BlueCheeser 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 BlueCheeser.
Last updated: July 30, 2025