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How to Remove the MSASCuiL.exe Virus in 3 Easy Steps

Short on time? Here’s how to remove the MSASCuiL.exe virus:

1. Scan Device — Run a “Full System Scan” with a high-quality antivirus (Norton is the best).

2. Remove Virus — After the scan is complete, let the antivirus remove all instances of the MSASCuiL.exe virus infection.

3. Stay Protected — Protect yourself from further infections with a high-quality internet security package (again, Norton is the best).

Removing the MSASCuiL.exe virus is a simple process, but you have to be careful — there’s a lot of bad advice out there. If you attempt a manual removal (by going into the computer’s command line) you might accidentally erase essential system files. Doing so can cause permanent damage to your computer’s operating system, and it might even stop it from functioning.

The safest way to remove the MSASCuiL.exe virus from your system is by downloading an antivirus. A good antivirus scanner will remove any traces of the virus from your system, quarantine compromised files, and use real-time virus scanning to prevent you from getting another malware infection.

Quick Tip: While Norton isn’t free, you can buy it, remove the MSASCuiL.exe infection from your computer, and then return it with Norton’s 60-day money-back guarantee.

Get Started Now — How to Remove the MSASCuiL.exe Virus

Preliminary Step: Checking for a MSASCuiL.exe Infection

Remember: Even if you have completed the manual checks and everything looks ok, you should still use an antivirus to get a second opinion!

If MSASCuiL.exe is currently running in your system processes and it’s located outside of its usual folder (C:\Program Files\Windows Defender — Note: Substitute “C:\” for your primary drive), then there’s a very good chance the file is dangerous.

You are at even more risk if MSASCuiL.exe is located in the “Windows” or “System32” folder.

If the file is in the correct location, to confirm it’s not malicious, you can check its file size.

Checking MSASCuiL.exe’s File Size

Right-click on the suspicious MSASCuiL.exe and click Properties at the bottom of the drop-down list.

Get Started Now — How to Remove the MSASCuiL.exe Virus

On the window that appears, look at the listing next to “Size” in the General tab.

If the file size is between 483,840 bytes and 631,808 bytes, then chances are the file is not malicious.

Get Started Now — How to Remove the MSASCuiL.exe Virus

If anything looks different, chances are you’ve got an active infection.

Step 1. Identify the MSASCuiL.exe Infection With Your Antivirus (And Don’t Make The Problem Worse!)

IMPORTANT: Do not connect your cell phone, tablet, or USB drive to an infected computer. In doing so, you risk the virus replicating itself onto those devices.

Once you’ve downloaded a secure antivirus program, run a full disk scan on your computer. Even if you think you know where the infection started or you know where the suspicious .exe file is located, a full disk scan is best.

A full disk scan will detect, quarantine, and remove every copy of the MSASCuil.exe virus, as well as ensure that your device isn’t infected with any other malware, including spyware, rootkits, or worms that can often run undetected.

Remember: Run the full system scan until it’s finished. DO NOT cancel the scan when you see the virus appear on the infected file list. There’s no way of knowing how many other copies of it exist in your system.

The full scan can take anywhere from 1–4 hours, so sit tight because your antivirus needs to analyze every single file and process on your computer.

When your antivirus has alerted you that the scan is complete, every instance of malware on your system will be identified and quarantined — including the MSASCuiL.exe virus.

You can now proceed to Step 2.

Step 2. Remove the MSASCuiL.exe Infection and Delete Any Other Infected Files

When your antivirus has identified and quarantined all of your compromised files, it will give you the option to delete them. Advanced users can go through the quarantined files and make sure there are no false positives before hitting the Delete button. But most users will just want to trust their antivirus software — if it’s been flagged as malware by a program like Norton, chances are you don’t want it on your device.

After you’ve removed all of the compromised files from your system, it’s a good idea to restart your computer.

After you restart your device, run a second full disk scan to ensure your antivirus has removed all traces of the MSASCuiL.exe infection. This may not take as long during the second scan — many antiviruses, including Norton, remember which files it has already scanned and are able to analyze your disk much more rapidly after the first full disk scan.

As before, be sure to let your antivirus finish its second scan. Once the scan is finished, and you’ve reviewed and deleted all of the compromised files in your quarantine, you can breathe a sigh of relief. Your device is 100% malware-free! For now…

Even though you’ve finished removing the MSASCuiL.exe virus, there are still thousands of malware files out there that can infect your devices, compromise your online accounts, and spread through your Wi-Fi network.

Step 3. Keep Your Device from Getting Re-Infected

Since the MSASCuiL.exe virus has infected you once already, you’ve witnessed first-hand just how easy it is to get malware on your PC.

New malware is released every day, and there’s also the risk of online data harvesting, identity theft, and public Wi-Fi hackers.

In today’s online world, how can you keep your devices and data safe? There are several things you can do:

  • Keep Your Software, OS, and Drivers Up-To-Date

When developers find vulnerabilities in their software that are being exploited by hackers, they patch those vulnerabilities and send the patches to users in the form of software updates.

Software updates can be annoying, but they are essential to keeping your computer safe from the latest malware threats.

However, with the amount of devices, apps, and programs that most users are running these days, it can be really hard to keep track of which programs need to be updated. One great tool comes from the antivirus provider Avira — it lets you scan your PC for out-of-date software and automatically update it.

It’s also incredibly important that you stay on the latest operating system and keep your drivers updated.

When an operating system ages, developers will stop supporting it. So any vulnerabilities won’t be fixed with updates. This means that older operating systems grow more and more vulnerable every day as hackers continue to develop tools to infiltrate them.

Most operating systems and programs have an auto-update option. Wherever possible, select this option to make sure you’re keeping all of your devices and system drivers up-to-date.

  • Don’t Download Suspicious Files

Whether it’s from an email or a suspicious website, don’t download files unless you’re 100% sure you recognize where they’re coming from. The vast majority of malware is delivered with seemingly legitimate free software or it’s attached to deceptive emails — if you don’t put malware on your computer, it’s very hard to get infected.

Your antivirus can help with this by scanning emails and tagging suspicious files, plus scanning all downloads before they can make changes on your computer. However, it’s still best to exercise common sense and avoid files from unknown sources.

  • Secure Your Wireless Network

Make sure your wireless network is secure before you go online. You can do this by using a firewall, but you should also ensure your home Wi-Fi connection is password-protected, too.

You can see if a connection is password-protected by looking in your network list — the ones that aren’t password-protected have a warning sign next to them.

Step 3. Keep Your Device from Getting Re-Infected

Unsecured networks are far more vulnerable since anyone can connect to them, but hackers can infiltrate a secured network, too.

Most people don’t think to set their Wi-Fi router’s password, and the default router password ends up being something like “password”. This is a very easy password to guess, and hackers guess these weak passwords and break into “password-protected” networks all the time.

To set a password for your home router, you will need to log into your router’s settings on a web browser and follow the instructions provided. When you purchased your router, you should have received instructions explaining how to do this. If not, try typing the router’s model number into Google.

Quick Tip: A safe password should be at least 15 characters long and use a random mix of letters, numbers, and special characters. You can use a password manager such as Dashlane to store all of your passwords, so you won’t have to worry about remembering your router’s password.

  • Download a Secure Antivirus Program

There are a ton of antivirus packages on the market. However, there are only a few that are truly excellent, providing all of the security protections that you need to stay safe online. You can check out 2021’s best antivirus packages here.

I really like Norton 360 — it’s a premium antivirus suite with one of the best anti-malware engines in the world, along with a ton of useful security protections. Norton’s antivirus scanner uses artificial intelligence, advanced heuristics, and a massive malware database to keep malware off of your device.

Norton also includes:

  • Anti-phishing protection — Flags suspicious websites and protects you from online scammers.
  • Firewall — Blocks hackers from entering your network.
  • Virtual private network (VPN) — Keeps your internet usage anonymous, preventing network attacks, web surveillance, and man-in-the-middle attacks.
  • Parental controls — Protects children by using content filters, app and screen time schedules, YouTube monitoring, and even location tracking.
  • System cleanup — Gets rid of junk files and increases system performance.
  • Password manager — Stores, generates, and auto-fills passwords, so hackers can’t steal them.
  • Identity theft protection (US only) — Monitors credit reports, the dark web, and breach databases for compromised accounts, and includes a $1 million insurance policy.

Frequently Asked Questions About the MSASCuil.exe Virus

🤔 What is MSASCuiL.exe?

The typical MSASCuiL executable is a genuine and safe Windows 10 application developed by Microsoft.

It’s short for Microsoft Antivirus Security Center User Interface Logo.

Microsoft developed MSASCuiL.exe in 2015 as a component of Windows Defender — Windows’s built-in antivirus engine.

MSASCuiL.exe is responsible for displaying the Windows Defender notification icon that you see on your system’s taskbar.

In most cases, MSASCuiL.exe won’t harm your system.

However, hackers are known to disguise malicious software, such as worms and trojans, by giving them the same names as trusted files (such as MSASCuiL.exe). They do this so that experienced users and virus scanners have a hard time detecting them.

If you suspect this has happened to you, follow the above steps on how to remove MSASCuiL.exe.

🤔 How Can MSASCuiL.exe Infect My Computer?

The MSASCuiL.exe virus is pretty common, and it’s most often shared with users through scam emails.

If you don’t recognize the email’s sender, and they’re trying to convince you to download a file, then the chances are the email is malicious.

Other methods of infection include:

  • Internet File Downloads — If you don’t trust the website you’re on, don’t download any files from it.
  • Social Media Links — With social media being as prominent as it is, many fake accounts share links containing virus downloads. If you see a page that looks too good to be true, chances are it is.
  • Text Messaging Apps — A lot of applications like WhatsApp have their own web clients that users use to share files between their phones and computers. Remember, just because a text messaging application was developed for phones, that doesn’t mean it can’t spread viruses to a computer system.

🤔 Should I Disable MSASCuiL.exe?

No. If you see MSASCuiL.exe running in your task manager, that doesn’t mean your computer is infected.

MSASCuiL.exe is often a legitimate file developed by Microsoft. For it to be running in the background of your system isn’t unusual, and to disable it could cause problems regarding the functionality of Windows Defender.

When in doubt, follow this guide on how to remove MSASCuiL.exe. It will take you through all the steps necessary in detecting and removing any malicious file on your system.

About the Author

Sam Boyd
Sam Boyd
Internet security researcher

About the Author

Sam Boyd is an avid tech researcher, who has spent the last decade working various roles across many scientific industries. In these roles, he manufactures and prototypes high-end products for prominent deployments across the world. He spends his spare time as an avid gamer, even going as far as data mining files to find hidden secrets.
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