Onion Ransomware


Onion Ransomware is actually an upgraded version of the so called CTB Locker Ransomware. Onion is a virus of the Ransomware category, which uses the so-called encryption method to lock the personal files of its victim and later blackmail them for the decryption key.

Onion Ransomware

The Onion Ransomware victim message

When talking about Ransomware, it is important to note that it is currently one of the most problematic and dangerous types of malware. Everyone is struggling to fight back the threat yet so far the overall progress in that direction has not been satisfactory. You are probably reading this because your data has already been taken hostage by Onion Ransomware. If so, you are surely looking for a way to have it unlocked without the need to pay any money to cyber-criminals. We might be able to help you with that but we give no guarantees whatsoever. There is an removal guide at the bottom of this article with detailed instructions on how to potentially deal with the nasty virus. We strongly recommend to try that first before you even start considering actually paying the ransom. Generally, complying with the blackmailer’s terms is a really bad idea, so keep that in mind. There is always the chance that you make the money transfer and get nothing in return. On the other hand, the removal guide that we offer is free and safe.

The Onion Ransomware

Antiviruses are unable to distinguish between a regular encryption and one done by Ransomware, which is how Onion Ransomware is perfectly capable of remaining totally unnoticed during the time it is trying to lock your documents.

Onion Ransomware

The Onion Ransomware encrypted files

Some virus types are infamous for their ability to destroy everything they see in their path while others are known for spying on their victims through a number of different methods. However, what’s typical about the Ransomware type is that it usually does not cause any damage to either the personal files or the PC system of the attacked user. Obviously, to have leverage on you, the blackmailer needs to make sure that you have some kind of a stimulus to pay them the money, which is why your files (and everything else) will normally remain intact if we don’t count the fact that they won’t be accessible to you. Due to the fact that no actual damage is being done, Onion Ransomware and other similar viruses are able to remain under the radar of most antivirus programs. One other important reason for their extremely high stealth capabilities is the fact they use encryption to make the files inaccessible. This is a method that is widely used as a form of data protection and is generally not seen as threatening. Antiviruses are unable to distinguish between a regular encryption and one done by Ransomware, which is how Onion Ransomware is perfectly capable of remaining totally unnoticed during the time it is trying to lock your documents.

How to know if your computer is infected

As we mentioned in the previous paragraph, your antivirus software is probably out of the equation when it comes to spotting a Ransomware threat. The only thing left to do is to be aware of what symptoms a virus such as Onion Ransomware might show so that you could potentially spot the virus yourself. Keep in mind, though, that this is certainly not an easy task and it is also quite possible that the virus will not display any symptoms whatsoever or if there are any, they’d be too subtle to notice. With that being said, here are the most frequently encountered ones:

  • Increased usage of free physical memory space on your PC is a very typical symptom of a Ransomware attack, because during the encryption, the virus needs additional HDD space in order to complete the process.
  • Most forms of malware (Ransomware included) require system resources such as CPU and RAM in order to finish their task. Therefore, if you notice any unexpected virtual memory and CPU spikes that are happening for no visible reason, you might want to investigate further in order to determine whether there’s an actual virus like Onion Ransomware on your machine.
  • Any weird PC behavior could be a sign of a malware infection. If your computer has gotten slowed-down or if a lot of errors and system freezes have started to occur, there could indeed be Ransomware that is currently messing with your files.

How to stop Ransomware

You need to understand that currently, your best option of keeping your files protected against Onion Ransomware, is to never allow the virus to enter your computer system. To do that, you must follow several simple, yet momentous PC protection rules:

  • Never download stuff from websites that have a shady-looking interface or ones that are illegal. Generally, you should stay away from such addresses and only visit sites with a good reputation in terms of safety.
  • Online spam is obviously a perfect method to spread malware throughout the internet. Hackers use everything from harmful e-mails with file attachments to shady Facebook/Skype messages containing malicious links in order to infect more computers with the nasty Ransomware. You must be very careful and always be on your guard for such spam.
  • Reliable and high-quality antivirus software can help you protect your machine against viruses of the Trojan horse type. Trojans are very commonly used as means of providing Ransomware with free passage into the computers of unsuspecting users.
  • Since Onion Ransomware and other Ransomware viruses target your personal data, making a backup of all your important files can absolutely neutralize the effect of the virus since even if the documents on your machine remain locked, you will still have accessible copies of them in your backup location.



Name Onion
Type Ransomware
Danger Level High (Ransomware is by far the worst threat you can encounter)
Symptoms RAM and/or CPU spikes during the encryption period as well as a decrease in the free physical memory space on your HDD.
Distribution Method Malicious online adverts/banners within illegal sites, harmful junk mail letters with file attachments/links, Trojan Horses, etc.
Data Recovery Tool Not Available
Detection Tool

Keep in mind, SpyHunter’s malware detection tool is free. To remove the infection, you’ll need to purchase the full version. More information about SpyHunter and steps to uninstall.

Remove Onion Ransomware

Onion Ransomware

Some of the steps will likely require you to exit the page. Bookmark it for later reference.

Reboot in Safe Mode (use this guide if you don’t know how to do it).

Onion Ransomware


Press CTRL + SHIFT + ESC at the same time and go to the Processes Tab. Try to determine which processes are dangerous. 

Onion Ransomware

Right click on each of them and select Open File Location. Then scan the files with our free online virus scanner:

Each file will be scanned with up to 64 antivirus programs to ensure maximum accuracy
This scanner is free and will always remain free for our website's users.
This file is not matched with any known malware in the database. You can either do a full real-time scan of the file or skip it to upload a new file. Doing a full scan with 64 antivirus programs can take up to 3-4 minutes per file.
Onion Ransomware
Drag and Drop File Here To Scan
Onion Ransomware
Analyzing 0 s
Each file will be scanned with up to 64 antivirus programs to ensure maximum accuracy
    This scanner is based on VirusTotal's API. By submitting data to it, you agree to their Terms of Service and Privacy Policy, and to the sharing of your sample submission with the security community. Please do not submit files with personal information if you do not want them to be shared.

    After you open their folder, end the processes that are infected, then delete their folders. 

    After you open their folder, end the processes that are infected, then delete their folders. 

    Note: If you are sure something is part of the infection – delete it, even if the scanner doesn’t flag it. No anti-virus program can detect all infections.

    Onion Ransomware

    Hold the Start Key and R –  copy + paste the following and click OK:

    notepad %windir%/system32/Drivers/etc/hosts

    A new file will open. If you are hacked, there will be a bunch of other IPs connected to you at the bottom. Look at the image below:

    Onion Ransomware

    If there are suspicious IPs below “Localhost” – write to us in the comments.

    Type msconfig in the search field and hit enter. A window will pop-up:

    Onion Ransomware

    Go in Startup —> Uncheck entries that have “Unknown” as Manufacturer.

    • Please note that ransomware may even include a fake Manufacturer name to its process. Make sure you check out every process here is legitimate.

    Onion Ransomware

    Type Regedit in the windows search field and press EnterOnce inside, press CTRL and F together and type the virus’s Name. 

    Search for the ransomware  in your registries and delete the entries. Be extremely careful –  you can damage your system if you delete entries not related to the ransomware.

    Type each of the following in the Windows Search Field:

    1. %AppData%
    2. %LocalAppData%
    3. %ProgramData%
    4. %WinDir%
    5. %Temp%

    Delete everything in Temp. The rest just check out for anything recently added. Remember to leave us a comment if you run into any trouble!

    Onion Ransomware 

    How to Decrypt Onion Ransomware files

    We have a comprehensive (and daily updated) guide on how to decrypt your files. Check it out here.

    If the guide doesn’t help, download the anti-virus program we recommended or try our free online virus scanner. Also, you can always ask us in the comments for help!


    About the author


    Brandon Skies

    Brandon is a researcher and content creator in the fields of cyber-security and virtual privacy. Years of experience enable him to provide readers with important information and adequate solutions for the latest software and malware problems.

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