Ransomware Research

Crypt0 Ransomware

Crypt0 is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on September 1, 2016, this ransomware has been actively targeting systems worldwide.

Quick Facts

Ransomware Family
Crypt0
First Seen
September 1, 2016

How Crypt0 Ransomware Works

Targeted Files

Insert infix 7-zip.chm -> 7-zip_crypt0.chm

Ransom Note and Payment Demands

After encrypting files, Crypt0 displays ransom notes demanding payment for file recovery:

fileHELP_DECRYPT.TXT

Ransom message:

notes/HELP_DECRYPT.TXT

Note locations:

EveryFolder

Technical Indicators

Associated Executable Files

The following executable files are associated with Crypt0 ransomware:

  • crypt0-Encrypt.exe
  • CryptXXX.exe
  • 1212
  • RANSOMWARE
  • very_nice.jpg
  • very-good.jpg

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About This Analysis

This Crypt0 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 Crypt0.

Last updated: July 30, 2025

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