Ransomware Research
Epsilon Ransomware
Epsilon is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on January 1, 2021, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: EpsilonCrypt, Crimson.
Quick Facts
- Ransomware Family
- Epsilon
- First Seen
- January 1, 2021
- Known Aliases
- EpsilonCryptCrimson
How Epsilon Ransomware Works
Targeted Files
suffix -> .[neftet@tutanota.com].boom
File Encryption Patterns
Epsilon modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..boomRansom Note and Payment Demands
After encrypting files, Epsilon displays ransom notes demanding payment for file recovery:
READ_ME.htaRansom message:
notes/READ_ME.hta
Note locations:
DesktopStartUpTechnical Indicators
Associated Executable Files
The following executable files are associated with Epsilon ransomware:
B221.exerwmt5qfy.exehp14m30p.exeG-654.exeG-654.binG-659.exeENVY-6542B-54.exeENVY-6542B-54.bin
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About This Analysis
This Epsilon 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 Epsilon.
Last updated: July 30, 2025