Leonem Trojan

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Leonem is a type of malicious software primarily used for espionage and data theft. Leonem belongs to the highly-versatile Trojan Horse malware category so it is possible that it could be used for other purposes, including Ransomware distribution and illegal cryptocurrency mining.

Leonem Trojan 1024x614

One of the most tricky things and problematic things related to infections with Trojan Horse programs is the timely detection of the malware invasion. For example, the recently discovered Leonem, which is a new addition to the malware family of the Trojan Horses, is known for its stealthy tactics and ability to operate in silence with no visible infection red-flags. However, seeing as how you are on this page, we assume that you are a user who suspects (or knows) that this virus has indeed attacked their computer. If that is the case, you have done a wise thing by coming to this page as here you may find professional help against the malicious malware program that may currently be messing with your computer’s system. The very fact that you have somehow managed to notice there is a Trojan like Leonem and Altruistics in your computer gets you closer to solving this problem and liberating your system from the presence of the nasty malware. Before we give you our instructions on eliminating Leonem, however, make sure you read a bit more about this threat so you have an idea what you are faced with.

The Leonem Trojan

You may have already heard about the infamous versatility of the Leonem trojan. In case you haven’t, know that an infection of this type like the Leonem trojan could be used for all sorts of criminal agendas, ranging from turning the infected computer into a DDoS or spam-bot, loading Ransomware in it, stealing data from the computer’s hard-drives and even gaining access to the online accounts of the user.


Danger Level High (Trojans are often used as a backdoor for Ransomware)
Symptoms High use of CPU and RAM as well as random errors and sudden crashes may sometimes indicate a Trojan Horse attack.
Distribution Method Pirated program downloads and spam messages are the usual methods of spreading Trojans.
Detection Tool

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Please follow all the steps below in order to remove Leonem!

How to remove Leonem

  1. First, click the Start Menu on your Windows PC.
  2. Type Programs and Settings in the Start Menu, click the first item, and find Leonem in the programs list that would show up.
  3. Select Leonem from the list and click on Uninstall.
  4. Follow the steps in the removal wizard.

If you have a Mac virus, please use our How to remove Ads on Mac guide.

If you have an Android virus, please use our Android Malware Removal guide.

If you have an iPhone virus, please use our iPhone Virus Removal guide.

What we suggest you do first is, check the list of programs that are presently installed on the infected device and uninstall any rogue software that you find there:

  • From the Start Menu, navigate to Control Panel ->>> Programs and Features ->>> Uninstall a Program.
  • Next, carefully search for unfamiliar programs or programs that have been installed recently and could be related to Leonem.
  • If you find any of the programs suspicious then uninstall them if they turn out to be linked to Leonem.
  • If a notification appears on your screen when you try to uninstall a specific questionable program prompting you to just alter it or repair it, make sure you choose NO and complete the steps from the removal wizard.

Remove Leonem from Chrome

  1. Click on the three dots in the right upper corner
  2. Go to more tools
  3. Now select extensions
  4. Remove the Leonem extension
  • Once you open Chrome, click on the three-dots icon to open the browser’s menu, go to More Tools/ More Options, and then to Extensions.
  • Again, find the items on that page that could be linked to Leonem and/or that might be causing problems in the browser and delete them.
  • Afterwards, go to this folder: Computer > C: > Users > *Your User Account* > App Data > Local > Google > Chrome > User Data. In there, you will find a folder named Default – you should change its name to Backup Default and restart the PC.
  • Note that the App Data folder is normally hidden so you’d have to first make the hidden files and folders on your PC visible before you can access it.

How to get rid of Leonem on FF/Edge/etc.

  1. Open the browser and select the menu icon.
  2. From the menu, click on the Add-ons button.
  3. Look for the Leonem extension
  4. Get rid of Leonem by removing it from extensions

If using Firefox:

  • Open Firefox
  • Select the three parallel lines menu and go to Add-ons.
  • Find the unwanted add-on and delete it from the browser – if there is more than one unwanted extension, remove all of them.
  • Go to the browser menu again, select Options, and then click on Home from the sidebar to the left.
  • Check the current addresses for the browser’s homepage and new-tab page and change them if they are currently set to address(es) you don’t know or trust.

If using MS Edge/IE:

  • Start Edge
  • Select the browser menu and go to Extensions.
  • Find and uninstall any Edge extensions that look undesirable and unwanted.
  • Select Settings from the browser menu and click on Appearance.
  • Check the new-tab page address of the browser and if it has been modified by “Leonem” or another unwanted app, change it to an address that you’d want to be the browser’s new-tab page.

How to Delete Leonem

  1. Open task manager
  2. Look for the Leonem process
  3. Select it and click on End task
  4. Open the file location to delete Leonem
  • Access the Task Manager by pressing together the Ctrl + Alt + Del keys and then selecting Task Manager.
  • Open Processes and there try to find a process with the name of the unwanted software. If you find it, select it with the right button of the mouse and click on the Open File Location option.
  • If you don’t see a “Leonem” process in the Task Manager, look for another suspicious process with an unusual name. It is likely that the unwanted process would be using lots of RAM and CPU so pay attention to the number of resources each process is using.
  • Tip: If you think you have singled out the unwanted process but are not sure, it’s always a good idea to search for information about it on the Internet – this should give you a general idea if the process is a legitimate one from a regular program or from your OS or if it is indeed likely linked to the adware.
  • If you find another suspicious process, open its File Location too.
  • Once in the File Location folder for the suspicious process, start testing all of the files that are stored there by dragging them to our free online scanner available below.
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    • If the scanner finds malware in any of the files, return to the Processes tab in the Task Manager, select the suspected process, and then select the End Process option to quit it.
    • Go back to the folder where the files of that process are located and delete all of the files that you are allowed to delete. If all files get deleted normally, exit the folder and delete that folder too. If one or more of the files showed an error message when you tried to delete them, leave them for now and return to try to delete them again once you’ve completed the rest of the guide.

    How to Uninstall Leonem

    1. Click on the home button
    2. Search for Startup Apps
    3. Look for Leonem in there
    4. Uninstall Leonem from Startup Apps by turning it off
    • Now you need to carefully search for and uninstall any Leonem-related entries from the Registry. The easiest way to do this is to open the Registry Editor app (type Regedit in the windows search field and press Enter) and then open a Find dialog (CTRL+F key combination) where you have to type the name of the threat. 
    • Perform a search by clicking on the Find Next button and delete any detected results. Do this as many times as needed until no more results are found. 
    • After that, to ensure that there are no remaining entries lined to Leonem in the Registry, go manually to the following directories and delete 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

    What is Leonem?

    However, the goal of Leonem may be different in each different attack and that is why we can’t really tell you what it may be seeking to achieve while in your system. The important thing is to stop the malware before it manages to carry out whatever malicious task it has been programmed to complete and this is where the guide you will see next should come in handy.
    After you hopefully deal with the elimination of the Trojan Horse, you really need to make the safety of your computer a priority as the next time a Trojan enters your computer you may not have the luck of noticing the malware and this could, in turn, lead to all kinds of unforeseen consequences.
    To ensure your computer is protected and is not at risk of getting attacked by another similar malware, you need to make sure that the sites you visit, the things you download and the content you interact with while surfing the net are not potentially hazardous. Also, since no matter how careful you are you can still end up with an infected machine, you will need some strong security tool or program that can boost the protection of your machine. There are many great and reliable antivirus and anti-malware program out there and one such is the tool we’ve posted in the guide from this article – you may give it a try and you can even use it alongside the removal guide in order to make the elimination of Leonem easier and more effective.


    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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