Ransomware Research
BASS-FES Ransomware
BASS-FES is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on November 1, 2017, this ransomware has been actively targeting systems worldwide.
Quick Facts
- Ransomware Family
- BASS-FES
- First Seen
- November 1, 2017
How BASS-FES Ransomware Works
File Encryption Patterns
BASS-FES modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..basslockRansom Note and Payment Demands
After encrypting files, BASS-FES displays ransom notes demanding payment for file recovery:
BASS File Encryption Service Notice.txtRansom message:
notes/BASS File Encryption Service Notice.txt
Note locations:
DesktopTechnical Indicators
Associated Executable Files
The following executable files are associated with BASS-FES ransomware:
hidden-tear.exe
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About This Analysis
This BASS-FES 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 BASS-FES.
Last updated: July 30, 2025