Ransomware Research

CrossLock Ransomware

CrossLock is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on April 1, 2023, this ransomware has been actively targeting systems worldwide.

Quick Facts

Ransomware Family
CrossLock
First Seen
April 1, 2023

How CrossLock Ransomware Works

File Encryption Patterns

CrossLock modifies encrypted files using specific patterns to mark them as encrypted:

File extensions added after encryption:

..crlk

Ransom Note and Payment Demands

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

file---CrossLock_readme_To_Decrypt---.txt

Ransom message:

notes/---CrossLock_readme_To_Decrypt---.txt

Note locations:

EveryFolder

Technical Indicators

Associated Executable Files

The following executable files are associated with CrossLock ransomware:

  • Notepad
  • NOTEPAD.EXE
  • crosslock.exe
  • teste.exe

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About This Analysis

This CrossLock 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 CrossLock.

Last updated: October 30, 2025

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