Ransomware Research
UserFilesLocker Ransomware
UserFilesLocker is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on February 1, 2017, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: CzechoSlovak.
Quick Facts
- Ransomware Family
- UserFilesLocker
- First Seen
- February 1, 2017
- Known Aliases
- CzechoSlovak
How UserFilesLocker Ransomware Works
File Encryption Patterns
UserFilesLocker modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..ENCRRansom Note and Payment Demands
After encrypting files, UserFilesLocker displays ransom notes demanding payment for file recovery:
__encrypt.pinfoRansom message:
notes/__encrypt.pinfo
Note locations:
DesktopRansom message:
notes/note.txt
Note locations:
LoginTechnical Indicators
Associated Executable Files
The following executable files are associated with UserFilesLocker ransomware:
Installer.exe0ce6a74f6ea7bb94cc0eeb84ea3b965d.elektronicka-komunikacia-instalacia.exeCheska.exeХ.exeELEKTRONICKA-KOMUNIKACIA-INSTALACIA.EXEUserFilesLocker.exeprehled_hotely.exe
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About This Analysis
This UserFilesLocker 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 UserFilesLocker.
Last updated: July 30, 2025