Ransomware Research
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
- Ransomware Family
- JCrypt
- First Seen
- December 1, 2020
- Known Aliases
- LockedDaddycryptOmeroJCrypt CryptoToys
How JCrypt Ransomware Works
File Encryption Patterns
JCrypt modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..jcrypt
..locked
..daddycrypt
..omero
..ncovid
..NotStonks
..crypted
..iam_watching
..vn_os
..wearefriends
..MALWAREDEVELOPER
..MALKI
..poison
..foxxy
..ZAHACKED
..JEBAĆ_BYDGOSZCZ!!!
Ransom Note and Payment Demands
After encrypting files, JCrypt displays ransom notes demanding payment for file recovery:
/_{1,3}RECOVER__FILES__\.\w+\.txt$/
Ransom message:
notes/___RECOVER__FILES__.jcrypt.txt
Note locations:
Desktop
READ_ME.crypted.txt
Ransom message:
notes/READ_ME.crypted.txt
Note locations:
Desktop
_#ODZYSKAJ_PLIKI--.JEBAĆ_BYDGOSZCZ!!!.txt
Ransom message:
notes/_#ODZYSKAJ_PLIKI--.JEBAĆ_BYDGOSZCZ!!!.txt
Note locations:
Desktop
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
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About This Analysis
This JCrypt 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 JCrypt.
Last updated: July 30, 2025