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:

file/_{1,3}RECOVER__FILES__\.\w+\.txt$/

Ransom message:

notes/___RECOVER__FILES__.jcrypt.txt

Note locations:

Desktop
fileREAD_ME.crypted.txt

Ransom message:

notes/READ_ME.crypted.txt

Note locations:

Desktop
file_#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: October 30, 2025

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