JCrypt Ransomware
JCrypt is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on December 1, 2020, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: Locked, Daddycrypt, Omero, JCrypt CryptoToys.
Quick facts
How JCrypt ransomware works
File encryption patterns
JCrypt modifies encrypted files using specific patterns to mark them as encrypted:
Ransom note and payment demands
After encrypting files, JCrypt displays ransom notes demanding payment for file recovery:
notes/___RECOVER__FILES__.jcrypt.txt
notes/READ_ME.crypted.txt
notes/_#ODZYSKAJ_PLIKI--.JEBAĆ_BYDGOSZCZ!!!.txt
Technical indicators
Associated executable files
The following executable files are associated with JCrypt ransomware:
- svchost.exe
- Microsoft Corporation.exe
- svchost%0C.exe
- WindowsFormsApp1.exe
- encrypter.exe
- SPREADTHECORRUPTION.exe
- winhelp.exe
- setup.exe
- WindowsFormsApp1 (2).bin
- WindowsFormsApp1.bin
- DaddyCrypt Ransomware.exe
- covid.exe
- StonksVirus.exe
- WindowsFormsApp1c.exe
- 1.exe
- vn_os.exe
- hehehe.exe
- MALKI.exe
- Foxxy.png.exe
About this analysis
This JCrypt ransomware analysis is part of Elastio's comprehensive ransomware detection database. Elastio provides advanced ransomware protection and recovery, helping organizations defend against and recover from ransomware attacks like JCrypt.
Last updated: December 30, 2025
Elastio detects JCrypt inside your data and backups.
The Hunt Engine uses Deep File Inspection to identify JCrypt across live data, replicated data, and backups. If this family is in your environment, Elastio finds it before encryption completes. Run a scan against your recovery points to confirm.
Recent ransomware
Explore other threats in our database