.Onyon Virus – Remove and Restore Your Files

.Onyon Virus – Remove and Restore Your Files

This article will help you to remove .Onyon Virus effectively. Follow the ransomware removal instructions at the end.

.Onyon is the extension that gets appended to your files after they are encrypted by the OnyonLock ransomware. Malware researchers state that it is a new variant of the BTCWare cryptovirus. When the payload of the ransomware is launched, your files become encrypted and the virus will leave a ransom note with payment instructions. Keep on reading below to see how you could try to potentially restore some of your files.

Threat Summary

Short DescriptionThe ransomware virus encrypts files on your computer and a ransom note will be left demanding that you pay an unspecified amount of money in Bitcoins, after contacting the extortionists.
SymptomsThis ransomware will encrypt your files and then append the extension .Onyon on every encrypted file.
Distribution MethodSpam Emails, Email Attachments, Executable Files
Detection Tool See If Your System Has Been Affected by OnyonLock


Malware Removal Tool

User ExperienceJoin Our Forum to Discuss OnyonLock.
Data Recovery ToolWindows Data Recovery by Stellar Phoenix Notice! This product scans your drive sectors to recover lost files and it may not recover 100% of the encrypted files, but only few of them, depending on the situation and whether or not you have reformatted your drive.

.Onyon Ransomware – Update

Update! A decryption tool is now available for all BTCWare ransomware variants (including .onyon)! The tool was created by the malware researcher Michael Gillespie. You can download the tool and read how to use it from the following article: Decrypt Files Encrypted by BTCWare Ransomware.

.Onyon Virus – Spread

The .Onyon file virus could spread its infection via various methods. One of these methods is seen as the main one for spreading it, which is with a payload file that executes the malicious script for the ransomware, which in turn infects your computer system. Such payload files can be seen distributed around the Internet and you can see examples being detected by many security vendors as showcased right here:

.Onyon file virus could spread its payload file on social media sites and file-sharing networks. Freeware applications which are found on the Web could be presented as useful but at the same time could hide the malicious script for the cryptovirus. Avoid opening files straight away after you have downloaded them. That stands especially for ones that came from sources like suspicious e-mails or links. What you should rather do is to scan files before opening them with a security tool, while also checking their size and signatures for anything dubious. Also, you should read the ransomware prevention tips given in the forum section.

.Onyon Virus – Details

The .Onyon file virus takes its name from the .Onyon extension that it appends to all files which it encrypts. Malware researchers have found that it is a variant of the the .BTCWare File Ransomware Virus.

The .Onyon file virus could make entries in the Windows Registry to achieve persistence, launch and repress processes in Windows. Some entries are designed in a way that will start the virus automatically with each boot of the Windows Operating System, and one such entry is outlined down below:


The ransom note will be placed inside your personal computer after the encryption process is complete. The note is written in English, but that doesn’t mean that the main aim of the virus is the English-speaking user. Inside, you will view the payment instructions for restoring your files. The ransom note is written in a file called “!#_DECRYPT_#!.inf”.

The !#_DECRYPT_#!.inf file will show the following ransom note:

That ransom note reads the following:

All your files have been encrypted due to a security problem with your PC.
If you want to restore them, write us to the e-mail: tk.btcw@protonmail.ch
You have to pay for decryption in Bitcoins. The price depends on now fast you write to us.
After payment we will send you the decryption tool that will decrypt all your files.

Before paying you can send to us up to 3 files for free decryption.
Please note that files must NOT contain valuable information
and their total size must be less than 10Mb

How to obtain Bitcoins
The easiest way to buy bitcoin is LocalBitcoins site.
You have to register, click Buy bitcoins and select the seller
by payment method and price

Do not rename encrypted files
Do not try to decrypt your data using third party software, it may cause permanent data loss
If you not write on e-mail in 3 days – your key nas been deleted and you cant decrypt your files

Your ID: mwhqtGwk3GPGBZ3fEWKaW5H75q5RgEfYxDjMWTq+N+00CWh5cz7u0wlfRAO0r8

The developers of the OnyonLock ransomware are using the ProtonMail encrypted email service for one of their samples as it can be seen from the note above. Different malware researchers detect the following two e-mail addresses to be used by OnyonLock:

  • tk.btcw@protonmail.ch
  • decrypter@onyon.su

Instructions presented in the ransom note of the .Onyon file virus should not be followed. You should NOT under any circumstances write to the cybercriminals. Nobody could give you a guarantee that your files will get restored if you pay the ransom. However, you could try to get 3 of your files decrypted, if at a later date a free decryptor is distributed.

.Onyon Virus – Encryption

The .Onyon file virus ransomware is spotted to encrypt files that have the following extensions:

→.exe, .cab, .xml, .dll

However, it is not excluded for the ransomware to target the extensions of its previous variant, which are:

→.1c, .3fr, .accdb, .ai, .arw, .bac, .bay, .bmp, .cdr, .cer, .cfg, .config, .cr2, .crt, .crw, .css, .csv, .db, .dbf, .dcr, .der, .dng, .doc, .docm, .docx, .dwg, .dxf, .dxg, .eps, .erf, .gif, .htm, .html, .indd, .iso, .jpe, .jpeg, .jpg, .kdc, .lnk, .mdb, .mdf, .mef, .mk, .mp3, .mp4, .mrw, .nef, .nrw, .odb, .ode, .odm, .odp, .ods, .odt, .orf, .p12, .p7b, .p7c, .pdd, .pdf, .pef, .pem, .pfx, .php, .png, .ppt, .pptm, .pptx, .psd, .pst, .ptx, .r3d, .rar, .raw, .rtf, .rw2, .rwl, .sql, .sr2, .srf, .srw, .tif, .wb2, .wma, .wpd, .wps, .x3f, .xlk, .xls, .xlsb, .xlsm, .xlsx, .zip

Each file that gets encrypted will receive the .Onyon extension appended to itself. Some malware researchers say that the algorithm being used for the encryption process is AES but that has not yet been confirmed.

The .Onyon file virus will erase the Shadow Volume Copies from the Windows operating system. That will make the encryption process more viable since it will eliminate one way for a possible file restoration. Keep on reading to see what ways you can try out to potentially recover some of your data.

Remove .Onyon Virus and Restore Your Files

In case your computer got infected with the .Onyon file virus, you should have some experience in removing malware. You should get rid of this ransomware as quickly as possible before it can have the chance to spread further and infect more computer systems. You should remove this ransomware and follow the step-by-step instructions guide provided down below.


Berta Bilbao

Berta is a dedicated malware researcher, dreaming for a more secure cyber space. Her fascination with IT security began a few years ago when a malware locked her out of her own computer.

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