Ransomware Research

BTCWare-Onyon Ransomware

BTCWare-Onyon is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on May 1, 2017, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: OnyonLock.

Quick Facts

Ransomware Family
BTCWare-Onyon
First Seen
May 1, 2017
Known Aliases
OnyonLock

How BTCWare-Onyon Ransomware Works

File Encryption Patterns

BTCWare-Onyon modifies encrypted files using specific patterns to mark them as encrypted:

File extensions added after encryption:

..onyon

Ransom Note and Payment Demands

After encrypting files, BTCWare-Onyon displays ransom notes demanding payment for file recovery:

file!#_DECRYPT_#!.inf

Ransom message:

notes/!#_DECRYPT_#!.inf

Note locations:

EveryFolder

Technical Indicators

Associated Executable Files

The following executable files are associated with BTCWare-Onyon ransomware:

  • BTCWare_Ransomware (2)
  • a.exe
  • BTCWare ransomware
  • locker.exe
  • rudi.exe
  • b.exe
  • locker_br123.exe
  • BTCWare ransomware (2)

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About This Analysis

This BTCWare-Onyon 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 BTCWare-Onyon.

Last updated: October 30, 2025

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