Fileless Malware


One of the most widely spread and feared type of malware that you can encounter is the Trojan Horse. Those malicious programs are a favorite tool of the majority of hackers and cyber criminals, regardless of their end-goal. The main reason for that is the infamous versatility of this kind of software viruses. Trojans can be used for an incredibly wide variety of illegal and malicious tasks and in the following article we will cover some of their most common uses.

Fileless Malware

Fileless Malware is a new program of the Trojan-based type, which is likely even more advanced and improved in comparison to its predecessors. That is why we believe that our readers need to be well informed about what Fileless and other Trojans are capable of, how they get inside one’s computer and what are the best methods to prevent them from invading your system.

Fileless Malware

The Fileless Malware

Also, down below the main part of the article, every one of you who has already had their machine attacked by this noxious software can find a detailed instruction manual that will guide you through the different steps of how you can potentially find and remove the nasty program from your machine. However, bear in mind that it is advisable you read the following paragraphs first, and then go for the guide instead of rushing straight for it without reading the rest of the information that we have to offer you. After all, being well-informed is the key to successfully and effectively dealing with any sort of malicious or unwanted software.

What are the dangers of a Trojan Horse?

As mentioned above, there is a myriad of potential harms or unwanted tasks that a typical Trojan Horse can execute once inside your machine. The bottom line is that if a Trojan attack is successful, the hacker could gain unlimited access to everything on your computer. Here are some of the most frequent uses of malware such as Fileless that you can expect.

  • Spying – Those infamous PC viruses are very often used as espionage tools. A hacker could employ a variety of methods to spy on their victim, some of which are keystroke logging, monitoring what is happening on your screen or even using your own webcam to directly see into your room. It should be obvious how much potential harm all of this could bring. Through keystroke logging and screen monitoring, the criminal can gain valuable information about your online accounts and even gain access to them and there is no need to even mention how disturbing and problematic it would be if someone could spy on you via your web camera.
  • Data and money theft – As we said, a Trojan Horse can grant full access to all your data. This could allow the cyber-criminal to obtain valuable information that you might have stored on your hard drive or even your cloud account. Besides, via the keystroke logging method, the hacker could enter your bank accounts and extract all money without you even realizing it until it’s too late. Blackmailing if you have sensitive data on your machine is also an option that should not be underestimated. Know that hackers will seek every possible exploit to gain the upper hand and get what they want from you.
  • Mining and botnet – Another possibility is that the criminal would attempt to use the resources of your computer for personal gain. Some Trojans can turn your PC into a mining bot that would use all available system resources in order to generate bitcoins that get sent directly to the hacker who’s using the virus. Another possibility is that your machine gets turned into a spam-bot, which would force it to send out spam messages and links without you being able to stop it.
  • Backdoor – In addition to all we already mentioned, malware programs such as Fileless might serve as a backdoor into your system for other malicious software such as the malicious Ransomware. This devious method for other malware to get inside your machine is extremely problematic because there is almost no way for you to spot and identify the threat until the damage has already been done.

The importance of staying safe

There are a lot of other possible harmful effects that a Trojan Horse could have on your system and virtual security. Therefore, staying safe and protected is extremely important. In addition to all the potential problems that Fileless can cause, it is also really difficult to detect the malware, since Trojans hardly even display any symptoms. Sometimes there might be spam and/or malicious-looking ads in your browser or a general PC slow-down, but if the hacker wants the virus to remain under your radar, it would be very difficult for you to do anything about it.

Protecting your system

Here are a couple of useful tips that might help you protect your online privacy and virtual security from any future malware attacks. It is surely much better to avoid getting infected by a malicious Trojan than having to find a way to remove it afterwards.

  • Install a reliable antivirus program. Since Trojan Horse viruses are one of the major problems that users can be faced with while surfing the net, security software companies are doing their best to keep their products up-to-date with the latest versions of Trojan Horse malware that are created.
  • Do not go to or download content from any shady-looking, illegal or obscure websites. Sticking to trusted and reputable sites is the best thing you can do in order to keep your system safe and clean of any potentially harmful software.
  • Avoid opening any suspicious hyperlinks or e-mails even if they have been sent by someone you know. After all, you never know if their computer has not been turned into a spambot by some nasty virus.


Name Fileless
Type Trojan
Danger Level  High (Trojans are often used as a backdoor for Ransomware)
Symptoms  There are little to no symptoms of Trojan Horse viruses. Generally, you can expect unusual PC behavior, sudden crashes and obscure and shady pop-ups in your browser.
Distribution Method  Illegal sites, malicious torrents, hidden and deceptive hyperlinks and the mandatory spam e-mail letters.
Detection Tool

Not Available

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.

How to Remove Fileless Malware

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

Fileless Malware

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).

Fileless Malware


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

Fileless Malware

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

Fileless Malware
Drag and Drop Files Here to Scan
Maximum file size: 128MB.

This scanner is free and will always remain free for our website's users. You can find its full-page version at:

Scan Results

Virus Scanner Result
Fileless MalwareClamAV
Fileless MalwareAVG AV
Fileless MalwareMaldet

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. 

Fileless Malware

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

Fileless Malware

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:

Fileless Malware

Fileless Malware

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

Fileless Malware

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:

Fileless Malware

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

Fileless Malware

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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