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Summary

This article describes an antimalware platform update package for Microsoft Defender for the following operating systems:

• Windows 10 (Enterprise, Pro, and Home editions)

• Windows Server 2019

• Windows Server 2016

This update changes the antimalware client version. New version: 4.18.2103.7 Note Version 4.18.2001.10 is re-released to prevent supersedence. For more information, see Manage Windows Defender Antivirus updates and apply baselines. Feb 15, 2021 Intego is the best anti-malware software for Mac users, and its additional features offer significant improvement over Apple’s built-in cybersecurity tools. Intego’s firewall automatically adjusts protections based on network activity, while the parental controls offer better content filtering than macOS. Mar 24, 2021 The best malware removal software and anti-malware tools and services aim to prevent malware infections on a protected machine, or help remove one from an unprotected one. Norton 360 is the best anti-malware software I’ve tried out. Its malware detection engine uses artificial intelligence to protect you against spyware, ransomware, viruses, and more. Microsoft Defender is the built-in Antimalware enabled in Windows Server 2016. The Microsoft Defender Interface is also enabled by default on some Windows Server 2016 SKU's see here for more information.The Azure VM Antimalware extension can still be added to a Windows Server 2016 Azure VM with Microsoft Defender, but in this scenario the extension will apply any optional configuration.

Version information

Note: After a new platform version is released, support for older versions (N-2) will reduce to technical support only. Platform versions older than N-2 will no longer be supported. See Manage Windows Defender Antivirus updates and apply baselines for details.

This update changes the antimalware client version.

• New version: 4.18.2103.7

Note Version 4.18.2001.10 is re-released to prevent supersedence. For more information, see Manage Windows Defender Antivirus updates and apply baselines.

How to find the client version information

• Windows 10, version 1709 and later versions
  Open the Microsoft Defender Security Center app, select the Settings icon, and then select About. The version number is listed under Antimalware Client Version.

• Windows 10, version 1607, version 1703, and later versions
  Open the Microsoft Defender app, select Help, and then select About. The version number is listed under Antimalware Client Version.

Package information

The package name is listed as Update for Microsoft Defender antimalware platform. The package size is approximately 2–3 MB.

Known issues in this update

• New file path
  Because of a change in the file path location in the update, many downloads are blocked when AppLocker is enabled.

  To work around this issue, open Group Policy, and then change the setting to Allow for the following path:

  %OSDrive%ProgramDataMicrosoftWindows DefenderPlatform*

Update information

This package includes monthly updates and fixes to the Microsoft Defender antimalware platform that is used by Microsoft Defender Antivirus in Windows 10.

Monthly updates are installed in addition to major Windows 10 releases. Both types of updates should be installed to ensure continued protection against malware and other threats.

For more information about the product versions and about how the updates work and how you can configure and manage them, see the Manage Windows Defender Antivirus updates and apply baselines topic.

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File location changes

This update makes the following binary location changes.

All third-party applications that have references to these binaries must be updated to the new locations.

How to obtain this update

This update is available from Microsoft Update and WSUS.

Restart requirement

You do not have to restart the system after you install this update.

Note Platform update 4.18.2001.10 might require a restart.

How to roll back this update

To roll back this update, use the appropriate method:

• To roll back this update to the previous version, run the following command:
  '%programdata%microsoftwindows defenderplatform<version>mpcmdrun.exe' -revertplatform

• To roll back this update to the Inbox CAMP version, run the following command:
  '%programfiles%Windows DefenderMpCmdRun.exe' -resetplatform

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References

Learn about the terminology that Microsoft uses to describe software updates.

Third-party information disclaimer

The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.

The Antimalware Service Executable process plays an important role in the Windows Defender Service that comes bundled with Windows 10 (and, despite the similarities in name, is completely unrelated to Emsisoft Anti-Malware!). However, it’s also infamous for consuming far more than its fair share of CPU processing power, and can even single handedly reduce your computer’s speed to a glacial crawl.

If you’re a Windows Defender user and have noticed high CPU usage for abnormally long periods of time, you’ll be pleased to know that the issue can easily be resolved.

In this article, we’ve put together a few simple steps you can follow to prevent Antimalware Service Executable from hogging your system’s resources and keep your machine running smoothly.

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What is the msmpeng.exe Antimalware Service Executable?

Do you use Windows Defender to protect your computer? If so, open up the Windows Task Manager (Ctrl + Shift + Esc or Start Menu > Task Manager), scroll through the list of background processes and you will find a process called Antimalware Service Executable and its corresponding file msmpeng.exe.

This process allows Windows Defender to continuously monitor your computer for potential threats and provide real-time protection against malware and cyberattacks. At the same time, however, it can also be the cause of disproportionately high CPU usage.

Another Windows Defender feature that may be responsible for slowing down your system is its Full Scan, which performs a comprehensive check of all files on your computer. Full Scan relies heavily on the CPU and is not afraid to use whatever resources your system has available; as a result, you may experience lag, delays, hanging and other system disruptions when it is running.

While it is normal for antivirus programs to consume system resources when running a scan, Windows Defender is far greedier than most. It is known to use excessive CPU for longer periods of time and carry out scans right when you’re waking up the computer to quickly send an email or check a website.

Although this can be frustrating, it’s important that you don’t disable Windows Defender without first installing another IT security solution – after all, it may be the only thing that stands between your computer and the bad guys! Let the program do its job, resolve any threats and then follow these steps to prevent the issue from happening again:

Fix #1: Change Windows Defender’s scheduling options

For most people, the high memory usage caused by Antimalware Service Executable typically happens when Windows Defender is running a full scan. We can remedy this by scheduling the scans to take place at a time when you’re less likely to feel the drain on your CPU.

1. Open the Start menu, type “task scheduler” and click the top result to launch the program.
2. In the navigation pane on the left, double click Task Scheduler Library. Continue to expand these folders and navigate to the following destination: Library/Microsoft/Windows/Windows Defender.
3. When you have opened the Windows Defender folder, double click Windows Defender Scheduled Scan, located in the middle pane.
4. Click the Conditions tab, uncheck all optionsand click OK. This will clear your scheduled scans.
5. To protect your computer, it is important to schedule some new scans, but we can do this in a way that will reduce the impact on your system’s performance. To do so, double clickWindows Defender Scheduled Scan, select the Triggers tab and click New.
6. Create a new scan schedule that suits your needs, selecting options that strike the balance between protection and system efficiency. As a guideline, we recommend (at minimum) weekly scans at a time when you’ll be unlikely to notice the increased CPU usage.
7. Repeat the process for the three remaining services (Windows Defender Cache Maintenance, Windows Defender Cleanup, Windows Defender Verification) found in the Library/Microsoft/Windows/Windows Defender folder.

Fix #2: Add Antimalware Service Executable to Windows Defender’s exclusion list

During its scans, Windows Defender checks every single file on your computer – including itself. This can occasionally result in some interesting interactions and is a common source of system lag. To prevent this from happening, you can simply instruct Windows Defender to skip itself when performing a system scan.

1. Press Ctrl + Shift + Esc to open Windows Task Manager.
2. In the list of processes, search for Antimalware Service Executable. Right click on the process and select Open File Location.
3. In the address bar, you’ll see the full path of Antimalware Service Executable. Click on the address bar and copy the full path.
4. Open the Start menu, type “windows defender” and click the top result to launch the Windows Defender Security Center.
5. Click on Virus & threat protection, then on Virus & threat protection settings.
6. Scroll down until “Exclusions” and click Add or remove exclusions. In the next screen, click on Add an exclusion, select Folder and paste the path to Antimalware Service Executable (MsMpEng.exe) in the address bar. Finally click Open and the folder will now be excluded from the scan.

Fix #3: Disable Windows Defender

If the problem persists after applying the first two fixes, you might be tempted to resort to disabling Windows Defender altogether. Keep in mind that doing so leaves you vulnerable to a range of cyberattacks, so it’s critical that you install an effective anti-malware product on your computer before removing Windows Defender.

Disable Windows Defender altogether using the Registry Editor.

1. Press Windows Key + R to open the Run Dialog Box.
2. In the Run Dialog Box, type regedit and click OK to open the Registry Editor.
3. In the navigation pane on the left, double click the folders to navigate to HKEY_LOCAL_MACHINESOFTWAREPoliciesMicrosoftWindows Defender.
4. If you find a registry entry named DisableAntiSpyware, double click it and set its value data to 1.

4b. If you do not see a registry entry named DisableAntiSpyware, right click in the main Registry Editor pane and select New > DWORD (32 bit) Value.

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4c. Name this new registry entry DisableAntiSpyware. Double click it and set its value data to 1.

Fix #4: Check for malware infections

It’s possible that something more malevolent is causing Windows Defender to disrupt your computer’s performance. Run a full system scan using a reputable and lightweight anti-malware solution such as Emsisoft Anti-Malware (we have a 30-day free trial available) to check your computer for any malware that may be affecting your computer’s ability to run smoothly and safely.

Windows Defender is a valuable tool, particularly since it comes free with your operating system, but it can certainly put a drain on your system’s CPU. By following the steps described in this article, you’ll be able to take control of Antimalware Service Executable and keep your computer running at full speed.

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Have an awesome (malware-free) day!