Ransomware Research

Crypt0L0cker Ransomware

Crypt0L0cker is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on August 1, 2016, this ransomware has been actively targeting systems worldwide.

Quick Facts

Ransomware Family
Crypt0L0cker
First Seen
August 1, 2016

How Crypt0L0cker Ransomware Works

Targeted Files

https://www.bleepingcomputer.com/forums/t/574608/crypt0l0cker-support-topic/page-44#entry4795322 Written in Python (2.7) Encrypts only \\Desktop\\Projekte\\ folder https://app.any.run/tasks/76a8eed6-98fc-4a78-8510-67a192c4281b/ https://www.hybrid-analysis.com/sample/1027d99f7658eb33867b821c30296c1043e4916cd93167a4c0ed941e6f1f0c1d?environmentId=100 Requires C&C https://web.archive.org/web/20170302151753/https://heimdalsecurity.com/blog/security-alert-new-torrentlocker-targets-denmark-ransomware/

File Encryption Patterns

Crypt0L0cker modifies encrypted files using specific patterns to mark them as encrypted:

File extensions added after encryption:

..encrypted..enc./\.[a-z]{6}$/

Ransom Note and Payment Demands

After encrypting files, Crypt0L0cker displays ransom notes demanding payment for file recovery:

fileCOMMENT_RESTAURER_DES_FICHIERS.txt

Ransom message:

notes/COMMENT_RESTAURER_DES_FICHIERS.txt
fileWichtige Information zum Wiederherstellen der Daten.htm

Ransom message:

notes/Wichtige Information zum Wiederherstellen der Daten.htm

Note locations:

Desktop
fileDECRYPT_INSTRUCTIONS.HTML
fileHOW_TO_RESTORE_FILES.html

Note locations:

EveryFolder
fileHOW_TO_RESTORE_FILES.txt

Ransom message:

notes/HOW_TO_RESTORE_FILES.txt

Note locations:

EveryFolder
fileDECRYPT_INSTRUCTIONS.TXT

Ransom message:

notes/DECRYPT_INSTRUCTIONS.TXT
fileSIFRE_COZME_TALIMATI.txt

Ransom message:

notes/SIFRE_COZME_TALIMATI.txt

Technical Indicators

Associated Executable Files

The following executable files are associated with Crypt0L0cker ransomware:

  • oqezujlg.exe
  • Send Bug Report
  • file.exe
  • file[1].exe
  • aa
  • VigXwo.vsd
  • encrypt2.exe
  • myfile.exe

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About This Analysis

This Crypt0L0cker 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 Crypt0L0cker.

Last updated: July 30, 2025

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