ONYONLOCK Ransomware

Also Known As: Onyonlock virus
Distribution: Low
Damage level: Severe

ONYONLOCK ransomware removal instructions


ONYONLOCK is a new variant of a ransomware-type virus called BTCWare. This virus was discovered by security researcher, MalwareHunterTeam. Following successful infiltration, ONYONLOCK encrypts various data stored on victims' computers. Furthermore, it appends the ".onyon" extension to the name of each encrypted file (for example, "sample.jpg" is renamed to "sample.jpg.onyon"). Once files are encrypted, ONYONLOCK creates a text file ("!#_DECRYPT_#!.inf"), placing it in each folder containing encrypted files.

The .inf file contains a message that informs victims of the encryption and states that they must pay a ransom to restore them by contacting cyber criminals via an email address ("decrypter@onyon.su") provided. Victims then supposedly receive detailed information. The cost is currently unconfirmed, however, cyber criminals usually demand the equivalent of between $500 and $1500 in Bitcoins. It is also stated that victims must make contact within three days, otherwise decryption keys are permanently deleted. It is currently unknown if ONYONLOCK uses a symmetric or asymmetric encryption algorithm, however, in any case, decryption without a unique key is impossible. This key is stored on a remote server controlled by cyber criminals and victims are encouraged to pay a ransom to receive it. Victims are permitted to attach three selected files (total size up to 10mb), which are decrypted and returned - this. supposedly to ensure that decryption is actually possible. In fact, research shows that cyber criminals often ignore victims, once payments are submitted and there is a high probability that you will be scammed. We strongly advise you to ignore all requests to contact these people or pay any ransom. Unfortunately, there are no tools capable of decrypting files compromised by ONYONLOCK ransomware and you can only restore your files/system from a backup.

Screenshot of a message encouraging users to pay a ransom to decrypt their compromised data:

ONYONLOCK decrypt instructions

There are dozens of ransomware-type viruses virtually identical to ONYONLOCK including, for example, GruxEx, Spora, Amnesia, and GlobeImposter. All of these viruses have identical behavior - they encrypt files and make ransom demands. The only major differences are cost of decryption and type of encryption algorithm (symmetric/asymmetric) used. Be aware that criminals proliferate ransomware via third party software download sources (torrents, eMule, free file hosting websites, freeware download websites, etc.), spam emails (infectious attachments), fake software update tools, and trojans. Therefore, never download software from unofficial sources or open attachments received from suspicious emails. In addition, keep your installed applications up-to-date and use a legitimate anti-virus/anti-spyware suite. Bear in mind, however, that ransomware is often distributed via fake software updaters. Therefore, never use third party tools to update your installed applications. Poor knowledge and careless behavior are the main reasons for computer infections. The key to computer safety is caution.

Update 22 May, 2017 - A decrypter for OnyonLock ransomware was released by Michael Gillespie. You can download this tool HERE.

onlyonlock ransomware decrypter

Message presented within ONYONLOCK .inf file ("!#_DECRYPT_#!.inf"):

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: decrypter@onyon.su
You have to pay for decryption in Bitcoins. The price depends on how 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 has been deleted and you cant decrypt your files

Your ID: -

Screenshot of files encrypted by ONYONLOCK (".onyon" extension):

Files encrypted by ONYONLOCK

ONYONLOCK ransomware removal:

Quick menu:

Step 1

Windows XP and Windows 7 users: Start your computer in Safe Mode. Click Start, click Shut Down, click Restart, click OK. During your computer start process, press the F8 key on your keyboard multiple times until you see the Windows Advanced Option menu, and then select Safe Mode with Networking from the list.

Safe Mode with Networking

Video showing how to start Windows 7 in "Safe Mode with Networking":

Windows 8 users: Start Windows 8 is Safe Mode with Networking - Go to Windows 8 Start Screen, type Advanced, in the search results select Settings. Click Advanced startup options, in the opened "General PC Settings" window, select Advanced startup. Click the "Restart now" button. Your computer will now restart into the "Advanced Startup options menu". Click the "Troubleshoot" button, and then click the "Advanced options" button. In the advanced option screen, click "Startup settings". Click the "Restart" button. Your PC will restart into the Startup Settings screen. Press F5 to boot in Safe Mode with Networking.

Windows 8 Safe Mode with networking

Video showing how to start Windows 8 in "Safe Mode with Networking":

Windows 10 users: Click the Windows logo and select the Power icon. In the opened menu click "Restart" while holding "Shift" button on your keyboard. In the "choose an option" window click on the "Troubleshoot", next select "Advanced options". In the advanced options menu select "Startup Settings" and click on the "Restart" button. In the following window you should click the "F5" button on your keyboard. This will restart your operating system in safe mode with networking.

windows 10 safe mode with networking

Video showing how to start Windows 10 in "Safe Mode with Networking":

Step 2

Log in to the account infected with the ONYONLOCK virus. Start your Internet browser and download a legitimate anti-spyware program. Update the anti-spyware software and start a full system scan. Remove all entries detected.

Download recommended remover for
Onyonlock virus

1) Download and install   2) Run system scan   3) Enjoy your clean computer!
By downloading any software listed on this website you agree to our Privacy Policy and Terms of Use. Free scanner checks if your computer is infected. To remove malware, you have to purchase the full version of Reimage.

If you cannot start your computer in Safe Mode with Networking, try performing a System Restore.

Video showing how to remove ransomware virus using "Safe Mode with Command Prompt" and "System Restore":

1. During your computer start process, press the F8 key on your keyboard multiple times until the Windows Advanced Options menu appears, and then select Safe Mode with Command Prompt from the list and press ENTER.

Boot your computer in Safe Mode with Command Prompt

2. When Command Prompt mode loads, enter the following line: cd restore and press ENTER.

system restore using command prompt type cd restore

3. Next, type this line: rstrui.exe and press ENTER.

system restore using command prompt rstrui.exe

4. In the opened window, click "Next".

restore system files and settings

5. Select one of the available Restore Points and click "Next" (this will restore your computer system to an earlier time and date, prior to the ONYONLOCK ransomware virus infiltrating your PC).

select a restore point

6. In the opened window, click "Yes".

run system restore

7. After restoring your computer to a previous date, download and scan your PC with recommended malware removal software to eliminate any remaining ONYONLOCK ransomware files.

To restore individual files encrypted by this ransomware, try using Windows Previous Versions feature. This method is only effective if the System Restore function was enabled on an infected operating system. Note that some variants of ONYONLOCK are known to remove Shadow Volume Copies of the files, so this method may not work on all computers.

To restore a file, right-click over it, go into Properties, and select the Previous Versions tab. If the relevant file has a Restore Point, select it and click the "Restore" button.

Restoring files encrypted by CryptoDefense

If you cannot start your computer in Safe Mode with Networking (or with Command Prompt), boot your computer using a rescue disk. Some variants of ransomware disable Safe Mode making its removal complicated. For this step, you require access to another computer.

To regain control of the files encrypted by ONYONLOCK, you can also try using a program called Shadow Explorer. More information on how to use this program is available here.

shadow explorer screenshot

To protect your computer from file encryption ransomware such as this, use reputable antivirus and anti-spyware programs. As an extra protection method, you can use programs called HitmanPro.Alert and EasySync CryptoMonitor, which artificially implant group policy objects into the registry to block rogue programs such as ONYONLOCK ransomware.

HitmanPro.Alert CryptoGuard - detects encryption of files and neutralises any attempts without need for user-intervention:

hitmanproalert ransomware prevention application

Malwarebytes Anti-Ransomware Beta uses advanced proactive technology that monitors ransomware activity and terminates it immediately - before reaching users' files:

malwarebytes anti-ransomware

  • The best way to avoid damage from ransomware infections is to maintain regular up-to-date backups. More information on online backup solutions and data recovery software Here.

Other tools known to remove ONYONLOCK ransomware: