To enable JavaScript and / or cookies, refer to the information in the relevant section below according to your web browser: This is because the Avast Store is unable to load and function correctly without these settings enabled. When you make a purchase via the Avast Store, you may be notified that you need to enable JavaScript and / or cookies in your web browser. Therefore, I agree with Microsoft with this design decision and I will be guiding my clients to stick with the defaults which protect the machine from malware while avoiding costly CPU hits.Enabling JavaScript and cookies in your web browser You can enable it with Group Policy or running this confusing double-negative PowerShell command: set-MpPreference -disableRemovabledrivescanning $false I tested the “scanusb.ps1” script and it failed to detect the sample malware file on a USB Drive.Īlso, the CPU spiked to 13% for the duration of the scan on the large drive.īut as soon as you attempt to interact with the file then its immediately caught by the AV engine:Īlso, be aware that The default behavior for scheduled scans is to not scan removable media. Reference: How to control USB devices and other removable media using Intune (Windows 10) – Windows security | Microsoft Docs” However, we recommend enabling real-time protection for improved scanning performance, especially for large storage devices. “You can optionally run a PowerShell script to perform a custom scan of a USB drive after it is mounted, so that Microsoft Defender Antivirus starts scanning all files on a removable device once the removable device is attached. Below is a sample script for achieving this scenario Reference: TechNet Custom scan a USB drive ()”Īnd a more recent, albeit abbreviated explanation from November 2020: However, if needed, Windows Defender Antivirus can be configured to perform a custom scan on all files when removable devices are mounted. (A dormant file on a removable drive cannot infect a host). This approach both mitigates the risk that a malicious threat can infect the host through a removable device, while maintaining host performance. Today, Windows Defender Antivirus performs quick scans on the contents of removable devices (such as USB drives), before the contents are copied, or executed. However, with the increase in device storage capacity, full scans of removable devices can noticeably and severely impact performance.
“Historically, antivirus products had a function to scan all files when a removable device was mounted. But this isn’t as bad as it sounds! Here is Microsoft’s explanation from ~four years ago:
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