Ransomware Research

CrystalCrypt Ransomware

CrystalCrypt is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on May 1, 2017, this ransomware has been actively targeting systems worldwide.

Quick Facts

Ransomware Family
CrystalCrypt
First Seen
May 1, 2017

How CrystalCrypt Ransomware Works

File Encryption Patterns

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

File extensions added after encryption:

..BLOCKED

Ransom Note and Payment Demands

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

message

Ransom message:

notes/note.txt

Note locations:

OnceOnCompletion
fileCrystalCrypt_Recover_Instructions.txt

Ransom message:

notes/CrystalCrypt_Recover_Instructions.txt

Note locations:

Desktop
screenshot

Ransom message:

notes/CrystalCrypt_Recover_Instructions.png

Note locations:

Desktop

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About This Analysis

This CrystalCrypt 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 CrystalCrypt.

Last updated: October 30, 2025

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