Nmon is a computer virus threat that can sneakily enter your system and initiate different damaging processes without needing your permission. Experts label Nmon as a Trojan horse virus due to its use of stealth tactics to get distributed and because of its versatile nature.


The Nmon.exe Virus


Multiple antivirus programs in VirusTotal are detecting the Nmon.exe Virus. Bear in mind that Nmon.exe is associated with OnMark 2000 Survey and is located in C:\Program Files\Viasoft\OnMark 2000 Survey\NMON.EXE. If you find it anywhere else it is considered potentially undesirable program.

The Nmon.exe Virus

The Nmon.exe virus represents the most common and widespread form of computer malware for both Windows and macOS computers – the infamous Trojan horse malware category. There’s hardly a computer user who hasn’t at the very least heard the term Trojan horse in association with something dangerous and harmful to the computer.

However, in order to successfully protect your system against such threats, it is required that you have a bit more information about their abilities, the infection tactics they use, and the possible ways you could remove them and keep them away fro your computer.

In the current post, Nmon.exe will be our main focus as it is the latest reported Trojan horse version. Since it is a newly released threat, it would take some time before it gets included in the databases of antivirus programs, meaning that, until then, this threat could enter your system and operate in it without getting spotted and intercepted even if you have a reliable antivirus in place on your machine.

How to know if Nmon.exe is in my computer?

If your antivirus hasn’t detected anything yet you think that you may have recently gotten attacked by Nmon.exe, know that the potential symptoms caused by this threat could greatly vary depending on the situation and on what the attacking malware is actually trying to achieve. If, for example, Nmon.exe is attempting to spy on you and collect sensitive private data from your computer, it is likely that there wouldn’t be any overly obvious signs of its presence on the computer. Espionage Trojans are known for their stealth and they hardly ever trigger any visible symptoms of their presence. Still, it may be worth it to check your computer’s Task Manager and look at the processes tab to see if there aren’t suspicious-looking processes that you don’t recognize in it.

In other instances, however, there could be some pretty disturbing and noticeable symptoms such as sudden Blue Screen system crashes, different software errors, severe slow-downs of the system, and screen freezes. Those are likely to occur if Nmon.exe is trying to corrupt and/or take over your system and use your computer’s resources for the completion of different malicious tasks. Such tasks could, for example, be the distribution of spam messages or the mining of Bitcoins from your computer. Needless to say, any cryptocurrency that gets mined in this way would automatically be sent to the hackers behind Nmon.exe, Wup.exe or any other malware.

As you can see, the symptoms and the possible uses of this virus could greatly vary. In some instances, you may even realize that your files have gotten encrypted because the Nmon.exe Trojan has introduced a Ransomware virus to your system. The key thing here is to always make sure to check your computer for any threats that may be hiding in it if you suspect that you may have been attacked by malware. Hopefully, the next guide will help you locate any malicious files and software that may currently be residing in your system and remove them before your computer and/or data have sustained any significant damage.


Name Nmon.exe
Type Trojan
Danger Level  High (Trojans are often used as a backdoor for Ransomware)
Symptoms  Data corruption, system errors and crashes, severe slowdowns of the computer, and other similar disturbances may sometimes be caused by a Trojan horse infection.
Distribution Method Trojan horse distribution methods vary from the use of misleading ads and spam messages to sites that spread pirated software (and everything in between).
Detection Tool

Remove Nmon.exe Virus

If you are looking for a way to remove Nmon.exe you can try this:

  1. Click on the Start button in the bottom left corner of your Windows OS.
  2. Go to Control Panel -> Programs and Features -> Uninstall a Program.
  3. Search for Nmon.exe and any other unfamiliar programs.
  4. Uninstall Nmon.exe as well as other suspicious programs.

Note that this might not get rid of Nmon.exe completely. For more detailed removal instructions follow the guide below.

If you have a Windows virus, continue with the guide below.

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


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).



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


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
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    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. 


    Hold together the Start Key and R. Type appwiz.cpl –> OK.


    You are now in the Control Panel. Look for suspicious entries. Uninstall it/them. If you see a screen like this when you click Uninstall, choose NO:



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


    Startup —> Uncheck entries that have “Unknown” as Manufacturer or otherwise look suspicious.

    • Remember this step – if you have reason to believe a bigger threat (like ransomware) is on your PC, check everything here.

    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:


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


    Type Regedit in the windows search field and press Enter.

    Once inside, press CTRL and F together and type the virus’s Name. Right click and delete any entries you find with a similar name. If they don’t show up this way, go manually to these directories and delete/uninstall them:

    • HKEY_CURRENT_USER—-Software—–Random Directory. It could be any one of them – ask us if you can’t discern which ones are malicious.
      HKEY_CURRENT_USER—-Software—Microsoft—-Windows—CurrentVersion—Run– Random
      HKEY_CURRENT_USER—-Software—Microsoft—Internet Explorer—-Main—- Random

    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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