Ransomware Research

JobCrypter Ransomware

JobCrypter is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on February 1, 2017, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: JobCrypter NextGen: Die Hard 4.

Quick Facts

Ransomware Family
JobCrypter
First Seen
February 1, 2017
Known Aliases
JobCrypter NextGen: Die Hard 4

How JobCrypter Ransomware Works

Targeted Files

https://app.any.run/tasks/4f64801d-5bbf-4502-ac5d-77316fe85f4c/#

File Encryption Patterns

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

File extensions added after encryption:

..locked..css..txt

Ransom Note and Payment Demands

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

fileComment débloquer mes fichiers.txt(Как разблокировать мои файлы)
filentuser.ini.css

Ransom message:

notes/ntuser.ini.css

Note locations:

UserProfile

Technical Indicators

Associated Executable Files

The following executable files are associated with JobCrypter ransomware:

  • FL.exe
  • 20.exe
  • JobCrypt.exe
  • L o c k e r.exe
  • ch.exe
  • Opera
  • 0806(23).exe
  • 4125478471.exe
  • Y76KVZT1.exe
  • H3I8J627.exe
  • 2 (3).exe
  • 71T5ZZKM.exe
  • myfile.exe
  • 2.exe
  • 216NTWLN.exe
  • 2KYZYYVP.exe
  • 2 (1).exe
  • officiel.exe
  • 784775471.exe
  • succeeded.exe
  • tredszer.exe
  • ransomware_die_hard_4.exe
  • 784578536.exe
  • dotNET_Reactor.exe
  • ERFFREEED.exe
  • yokingg.exe
  • yokingg.bin
  • lokjhgfder.exe

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About This Analysis

This JobCrypter 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 JobCrypter.

Last updated: July 30, 2025

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