Ransomware Research
EncoderCSL Ransomware
EncoderCSL is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on February 1, 2020, this ransomware has been actively targeting systems worldwide.
Quick Facts
- Ransomware Family
- EncoderCSL
- First Seen
- February 1, 2020
How EncoderCSL Ransomware Works
Targeted Files
available samples encrypt only test files -> *.txtr;*.test
File Encryption Patterns
EncoderCSL modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..lockedRansom Note and Payment Demands
After encrypting files, EncoderCSL displays ransom notes demanding payment for file recovery:
READ.txtRansom message:
notes/READ.txt
Note locations:
DesktopREAD_IT.txtRansom message:
notes/READ.txt
Note locations:
DesktopTechnical Indicators
Associated Executable Files
The following executable files are associated with EncoderCSL ransomware:
EncoderCSL.exetesing.exe
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About This Analysis
This EncoderCSL 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 EncoderCSL.
Last updated: July 30, 2025