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:

..ENCR

Ransom Note and Payment Demands

After encrypting files, UserFilesLocker displays ransom notes demanding payment for file recovery:

file__encrypt.pinfo

Ransom message:

notes/__encrypt.pinfo

Note locations:

Desktop
message

Ransom message:

notes/note.txt

Note locations:

Login

Technical Indicators

Associated Executable Files

The following executable files are associated with UserFilesLocker ransomware:

  • Installer.exe
  • 0ce6a74f6ea7bb94cc0eeb84ea3b965d.
  • elektronicka-komunikacia-instalacia.exe
  • Cheska.exe
  • Х.exe
  • ELEKTRONICKA-KOMUNIKACIA-INSTALACIA.EXE
  • UserFilesLocker.exe
  • prehled_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: October 30, 2025

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