MSASCuiL.exe Msascuil – What is It?

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There are lots of users who notice the msascuil.exe process on their Windows PC. By the way, what is msascuil? Is it a virus or malware? How to get rid of it? Now, let us explore these questions together here.


Apparently, lots of users think that msascuil.exe is a virus or malware. In fact, it is a legitimate file/process that belongs to a part of Microsoft Windows 10 as well as the Windows Defender user interface. Usually, the msascuil.exe file is located in the C:\Program Files\Windows Defender folder. It is used to show the Windows Defender icon in the taskbar. But, most of these files and processes such as msascuil.exe, Toaster.exe, DataStore.edb always trigger various kinds of problems like high CPU usage and virus. Even, lots of cybercriminals use the name of msascuil.exe to camouflage their malicious programs and processes in Task Manager.

Msascuil is associated with Windows Defender, an antivirus suite made by Microsoft. As we said before, it is a legitimate file/process which can be trusted. But, cyber criminals often use the names of legitimate files/processes to camouflage malicious software and their processes in Task Manager. Usually, they create minor changes to names that cannot be noticed without careful inspection. Moreover, malicious files with similar names are placed in other folders and not those designated for the original (legitimate versions). In this case, a malicious file/process is placed outside of the “C:\Program Files\Windows Defender” folder. Usually, malicious files have graphical icons beside them, whereas genuine system processes do not.

If the msascuil.exe filename is used to camouflage a malicious file, it must be removed immediately. It can be a trojan which may lead to serious issues relating to browsing safety, financial loss, privacy, additional infections, and so on. Also, the list of camouflaged malicious applications includes a cyptocurrency miner named COINMINER/CoinMiner. Before taking any action, we suggest you run a scan with the installed antivirus or anti-spyware suite and check if it detects any threats relating to this file. However, due to mistakes in databases, several anti-virus or anti-spyware tools detect legitimate files as threats. Then, instigate removal of harmless system files. Once security software detects legitimate files as threats, this is named a “false positive” result. Fortunately, those mistakes are fixed quickly. In any case, before removing files, we suggest you verify that they are placed in the correct folders and have correct names.

Commonly, the Cyber criminals disguise malware by using the names of legitimate files and processes. Sometimes those actions lead to ‘false positive’ results. As a result of that flagging legitimate files as threats. However, if there is good reason to trust that there is malicious software installed on the system, it should be removed immediately. Some instances of other files which are legitimate but can be identified as threats or used to disguise malware are gwx.exe, msfeedssync.exe, and csrss.exe.

Now, you may have an overall understanding of msascuil. So, how to check if it is safe or a virus? To find out that information, keep reading the following text.


Since the name of msascuil is frequently created with slight changes, it cannot be noticed without careful inspection. In addition, several malicious files come with similar names which are located in other folders and not the original and legitimate versions. To verify the legitimacy of msascuil.exe, you are able to refer to the three aspects below:

  • The directory location of msascuil.

The legitimate msascuil file is placed in the C:\Program Files\Windows Defender folder by default. If you find it is placed outside the folder and have graphical icons, we are sure that it is not a genuine system process.

  • File size.

If you are still confused regarding the msascuil.exe file, you are able to right-click it and choose Properties to take a look at the size of the file. Usually, the size of this file ranges from 483,840 bytes to 631,808 bytes depending on your current Windows OS.

  • Whether it is able to open like most other standard programs.

If it is not a genuine process, a visible window will not be opened when clicked.

Those malicious programs are installed on your computer through an email disguised as official. Therefore, when you ensure the msascuil.exe is a malicious program, you have to get rid of it immediately. Now, you may want to know how to remove msascuil.exe. If so, please move on to the following text.


First of all, you have to be aware that removing msascuil may cause some potential risk to your system. This is due to a legitimate msascuil file that is the component of Windows Defender, that is responsible to prevent your Windows system from virus attack and some high risk computer bugs. So, before removing the malicious msascuil file, you need to ensure that you have a full scan of your whole system using a high quality antivirus tool. To get rid of msascuil.exe, you are able to follow the full instructions below:

  • At the first step, you have to restart your computer into Safe Mode. If you do not know how to do that, you are able to read other articles on our sites.
  • The second step, you have to press the Ctrl + Shift + Esc keys at the same time to open the Task Manager window and then go to the Processes tab.
  • After that, you are able to right-click the msascuil file and choose Open File Location. Next, scan this file by using a virus scanner. If it is infected by a virus, end this process and remove the file in its folder.
  • Now, you need to press the Win + R keys to open the Run dialog box, and then type appwiz.cpl in it. Hit Enter.
  • In the pop-up window, simply right-click the suspicious program and click on Uninstall. Please follow the on-screen prompts to complete the uninstallation.

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