Ransomware Research
JoJoCrypter Ransomware
JoJoCrypter is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on March 1, 2021, this ransomware has been actively targeting systems worldwide.
Quick Facts
- Ransomware Family
- JoJoCrypter
- First Seen
- March 1, 2021
How JoJoCrypter Ransomware Works
Targeted Files
written in NodeJS;npm install node-rsa needs userdate folder with myid.json,publickey.pem needs filenames to encrypt in stdin
File Encryption Patterns
JoJoCrypter modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..jojocryptRansom Note and Payment Demands
After encrypting files, JoJoCrypter displays ransom notes demanding payment for file recovery:
how to recover your files.txtRansom message:
notes/how to recover your files.txt
Note locations:
EveryFolderTechnical Indicators
Associated Executable Files
The following executable files are associated with JoJoCrypter ransomware:
cleaner.exeaut9833.tmpclean.exe
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About This Analysis
This JoJoCrypter 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 JoJoCrypter.
Last updated: July 30, 2025