Trojan-Spy.Js.Sonar.a is a virus that is categorized by security researchers as a Trojan horse. This makes Trojan-Spy.Js.Sonar.a highly dangerous and it should be removed from the infected system immediately.


Trojan-Spy.Js.Sonar.a will make your computer slow

Trojans are notoriously dangerous and can cause extensive damage to the computer they’re on. But they can also have long lasting negative consequences for the affected users, as well.

For example, with the help of Trojans, cybercriminals can steal your identity and use it to commit all sorts of crimes in your name. They can take out loans, make purchases on your behalf, etc. Another extremely common usage for Trojans is financial fraud, so you could easily have your bank account wiped clean or you can be tricked into sending money to the hackers – the possibilities are endless.

On top of that, Trojans like Trojan-Spy.Js.Sonar.a can be used to insert other viruses into your computer, most notably ransomware. And if you aren’t familiar with this type of malicious software, it can rob you of your most important files and demand that you pay a ransom for their release. So you can only imagine the type of implications that can have for you if you’re a company or even a private person whose files are of a very sensitive nature.

And that’s not to mention the spying potential of malware variants like Trojan-Spy.Js.Sonar.a. Actually, one of the most common usages of Trojan horse viruses is spying. There are myriads of techniques that a Trojan can employ in order to serve as the eyes and ears of the hackers on your computer – sometimes even literally. For instance, they can hack into your webcam and mic and allow the cybercriminals to listen in on your conversations or watch you without your knowledge.

Alternatively, Trojans can also log your keystrokes and thus have access to everything you use your keyboard to type. They can even share your screen with the hackers and they will be able to see everything you do on your computer. And some of the more sophisticated versions of this malicious software can even have your traffic pass through the remote servers of the cybercriminals, thus granting them access to everything you do online.

And that’s not all. A less ominous usage of malicious pieces of programming like Trojan-Spy.Js.Sonar.a is resource exploitation. So for example, the hackers behind Trojan-Spy.Js.Sonar.a may want to mine cryptocurrencies on your computer to line their own pockets.

Alternatively, they may use your computer’s resources to send out spam or infect other machines in the same network.

As you can see, there is endless potential for mayhem with viruses like Trojan-Spy.Js.Sonar.a. And that is why it is critical for your safety and that of your system that you remove this Trojan as soon as possible. Below we have put together a comprehensive guide that will walk you through the steps necessary to locate and delete this virus. But if you’d rather prefer to have this process handled automatically, then we have a professional malware tool available on this page for you, as well.



Name Trojan-Spy.Js.Sonar.a
Type Trojan
Detection Tool

anti-malware offerOFFER *Read more details in the first ad on this page, EULA, Privacy Policy, and full terms for Free Remover.

Trojan-Spy.Js.Sonar.a Virus Removal

The quick removal method below may help you detect and remove Trojan-Spy.Js.Sonar.a in case that it has nested inside the list of programs in your Control Panel: 

  1. Press Start and R keyboard keys together. A Run box will show up.
  2. Type appwiz.cpl in the Run box and press Enter.                                                                                                                                   
  3.  appwiz 
  4. This command will automatically open the following directory for you Control Panel>Programs and Features>Uninstall a Program
  5. Try to find Trojan-Spy.Js.Sonar.a in the list of programs and uninstall it.
  6. Uninstall the Trojan by clicking on the uninstall button.
  7. If you find other unfamiliar programs in the list, research them and uninstall them if needed.
  8. If a notification like the one below shows up when you click Uninstall, choose NO:


Repeating the steps above may rid you of the main threat, but may not remove the Trojan-Spy.Js.Sonar.a-related entries from other system locations. Thus, if you want to remove Trojan-Spy.Js.Sonar.a completely, please follow the detailed guide that follows:


For the smooth completion of this guide, it is best to Bookmark this page so you can get back to it quickly. Also, before you start the removal process of Trojan-Spy.Js.Sonar.a, make sure that your computer is rebooted in Safe Mode. This will allow for quicker detection of the Trojan.



Once you enter Safe Mode, use the CTRL + SHIFT + ESC key combination to open the Windows Task Manager. Next, click on the Processes Tab and look for dangerous processes in the list. 


If you find a suspicious-looking process, right-click on it and then tap on the “Open File Location” option as shown on the image above. Drag and drop the files from that file location in the free online virus scanner that is available here:

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    Run a file scan and wait for the results. If the files turn up malicious, end their process and delete their folders from the file location.


    Go to the Windows Search field and type Regedit. After that press Enter and this will launch the Registry Editor.  

    Once in it, press CTRL and F from the keyboard and type the Name of the Trojan in the text field. Press Find Next to perform a search in the registry. Delete any results by right-clicking on them.  After that, to ensure that all Trojan-Spy.Js.Sonar.a-related entries have been removed, go manually to these directories and delete/uninstall them:

    • HKEY_CURRENT_USER—-Software—–Random Directory. 
    • HKEY_CURRENT_USER—-Software—Microsoft—-Windows—CurrentVersion—Run– Random
    • HKEY_CURRENT_USER—-Software—Microsoft—Internet Explorer—-Main—- Random


    Sometimes, Trojans may add entries in the Startup tab. The role of these entries is to help the malware launch upon system startup. Your job in this step will be to disable these entries if there are any. For that, type msconfig in the search field and hit enter. You should see the System Configuration app on the screen. Select the Startup tab and remove the checkmark for any entries that seem to be related to the threat or look suspicious.


    Attention! If you think that some bigger threat (such as ransomware or spyware) has sneaked inside your PC along with the Trojan, please follow these steps:

    Press the Start and R keyboard keys together and  copy the command below in the Run box that shows up on the screen:

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

    Press Enter and you should see a simple text file named Hosts on your screen. Scroll to the bottom of the file and find where it is written Localhost. Check for suspicious IPs below localhost and if you find any, please write us in the comments. Sometimes the presence of questionable IPs may be an indication that the computer is hacked.

    hosts_opt (1)

    If you complete all the steps in the guide but Trojan-Spy.Js.Sonar.a still shows signs of its presence in the system, please use the recommended removal tool to scan your computer for hidden entries. Also, feel free to leave us a comment below this post if you need any help.


    About the author


    Violet George

    Violet is an active writer with a passion for all things cyber security. She enjoys helping victims of computer virus infections remove them and successfully deal with the aftermath of the attacks. But most importantly, Violet makes it her priority to spend time educating people on privacy issues and maintaining the safety of their computers. It is her firm belief that by spreading this information, she can empower web users to effectively protect their personal data and their devices from hackers and cybercriminals.

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