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Accessing the USB drive or ports mainly on the computers of offices, workplaces, schools, colleges, labs, restricted areas are disabled by the system administrator. You may have noticed this. Whenever you try to insert any USB flash drive to the USB port of those PCs, you will not get any response neither from the computer nor the USB drive. The reasons for blocking the USB port access is very much clear. The computers of those places may have secured/restricted and valuable contents. So to prevent unauthorized access to those files, to protect copying of those files, a system administrator can block any USB drive support to such PC. Sometimes from infected USB drive virus can spread to those computers which result in loss of sensitive data. These are the main reasons.

Possible Methods of Restricting access to USB drives

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Anyone can disable USB ports by using any of the methods mentioned below. You can enable the USB port access and make them working the external drive ports normally anytime by reverting the changes.

  1. Change the registry values for USB mass storage devices and disable USB ports.
  2. Disable USB removable disks and USB flash drives by using Group and Policy editor.
  3. Disable USB ports using the command prompt.
  4. Disable the USB port options from Device manager of Windows.
  5. Uninstall the USB mass storage driver.
  6. Block USB drives using third-party Windows software.

Now, let me describe each method so that anyone can enable USB port access to your PC.

Also useful:Protect USB drives from spreading Virus infection

Method #1: Enable USB when System Admin Prevents Using of USB Drives and Mass Storage Devices Using Windows Registry

In order to enable/disable mass storage or USB drives, you need to be an administrator account holder of Windows 10/8/7 PC. Because RegEdit always requires admin privilege to run.

  1. Open registry editor of Windows computer. In the search box of Windows 10, type ‘Regedit’ and select the appropriate option from the search results. Alternatively, go to Start -> Run and type ‘Regedit’ in the run box and press enter button.
  2. Navigate to the following registry key:
  3. In the right-pane of the USBTOR key, choose Start DWORD 32-bit value and change its value to 3 from 4. This will enable the pen drive access and make all the USB drives working correctly in your office, school/college.

Method #2: Enable USB Ports from Device Manager if it is Disabled

If you do not find anything wrong in the Windows registry, you need to check serial port section of the “Device Manager”. Sometimes it is blocked by the system administrator to prevent external USB or mass storage access. If you find any Universal Serial Bus controllers disabled, just make it enable.

Method #3: Check the Windows Group & Policy editor and Enable USB port

Deny all access to removable storage using Windows Group and Policy editor is another way which is used by the system administrator. So, if you see that the external USB storage is not working on your Windows computer, and if have already tried the above-mentioned procedures, just check the Group & Policy editor carefully. If you do not have admin account access to your PC, then can’t make the desired changes to make the USB ports working on your PC.

  1. Press Windows+R to open the Run dialogue box. Type gpedit.msc in the box and press enter.
  2. Navigate to Computer Configuration -> Administrative Templates -> System -> Removable storage access.
  3. Select All Removable Storage classes: Deny all access option.
  4. Double click on it.
  5. Make it disable if it is set to enable.
  6. Thus you can get success to unblock USB access of a PC.

Method #4: Reinstall USB Mass Storage Driver on Your PC

The worst approach to restricting users from using external mass storage on a PC is by uninstalling USB mass storage drivers. When the authority tries to prevent data sharing or prevents something similar to a virus infection on a PC, USB port access can be blocked for the users by uninstalling USB mass storage drivers from the computer. The authority must block software installation on the PC.

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If you want to enable USB port in such PC, it is very difficult. Admin access is the first thing that you mainly need. Find the suitable USB driver for your PC. Install it. You may require administrative credentials to install USB drivers. After installing the drivers, the USB ports will start to functioning again.

Method #5: Disable Suspicious Tasks and Uninstall USB Port Blocker Software

In some computers, the system admins use USB drive disabler software (like Ratool or Intelliadmin) and thus they prevent users from connecting the USB device. To bypass USB restriction, you need to find and uninstall such software from PC. Also, open windows task manager and kill the task(s) and process(es) which you find suspicious. You can try Microsoft Fixit to fix to make the USB work like before.

Final Words:

Most of the organizations (schools, colleges, offices, etc.) restrict users to connect USB ports to the PCs by disabling the ports (to secure important documents, files etc.). However, anyone can bypass the restriction by removing the cause that prevents you from using the USB ports. Here is the summary which helps you to enable USB mass storage device on a PC.

Change Windows registry setting and use USB port again.

Change Group & Policy editor setting to enable external pen drive/flash drive access.

Enable USB ports options from device manager.

Uninstall USB blocker software and enable USB access to any computer.

Hope this tutorial helps you to unblock USB ports which are blocked in office, school, and college.

Also useful:Unblock Facebook at Office, School, and College

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Applies to:Microsoft Defender for Endpoint

Microsoft recommends a layered approach to securing removable media, and Microsoft Defender for Endpoint provides multiple monitoring and control features to help prevent threats in unauthorized peripherals from compromising your devices:

  1. Discover plug and play connected events for peripherals in Microsoft Defender for Endpoint advanced hunting. Identify or investigate suspicious usage activity.

  2. Configure to allow or block only certain removable devices and prevent threats.

    1. Allow or block removable devices based on granular configuration to deny write access to removable disks and approve or deny devices by using USB device IDs. Flexible policy assignment of device installation settings based on an individual or group of Azure Active Directory (Azure AD) users and devices.

    2. Prevent threats from removable storage introduced by removable storage devices by enabling:
      - Microsoft Defender Antivirus real-time protection (RTP) to scan removable storage for malware.
      - The Attack Surface Reduction (ASR) USB rule to block untrusted and unsigned processes that run from USB.
      - Direct Memory Access (DMA) protection settings to mitigate DMA attacks, including Kernel DMA Protection for Thunderbolt and blocking DMA until a user signs in.

  3. Create customized alerts and response actions to monitor usage of removable devices based on these plug and play events or any other Microsoft Defender for Endpoint events with custom detection rules.

  4. Respond to threats from peripherals in real-time based on properties reported by each peripheral.

Note

These threat reduction measures help prevent malware from coming into your environment. To protect enterprise data from leaving your environment, you can also configure data loss prevention measures. For example, on Windows 10 devices you can configure BitLocker and Windows Information Protection, which will encrypt company data even if it is stored on a personal device, or use the Storage/RemovableDiskDenyWriteAccess CSP to deny write access to removable disks. Additionally, you can classify and protect files on Windows devices (including their mounted USB devices) by using Microsoft Defender for Endpoint and Azure Information Protection.

Discover plug and play connected events

You can view plug and play connected events in Microsoft Defender for Endpoint advanced hunting to identify suspicious usage activity or perform internal investigations.For examples of Defender for Endpoint advanced hunting queries, see the Microsoft Defender for Endpoint hunting queries GitHub repo.

Sample Power BI report templates are available for Microsoft Defender for Endpoint that you can use for Advanced hunting queries. With these sample templates, including one for device control, you can integrate the power of Advanced hunting into Power BI. See the GitHub repository for PowerBI templates for more information. See Create custom reports using Power BI to learn more about Power BI integration.

Allow or block removable devices

The following table describes the ways Microsoft Defender for Endpoint can allow or block removable devices based on granular configuration.

ControlDescription
Restrict USB drives and other peripheralsYou can allow/prevent users to install only the USB drives and other peripherals included on a list of authorized/unauthorized devices or device types.
Block installation and usage of removable storageYou can't install or use removable storage.
Allow installation and usage of specifically approved peripheralsYou can only install and use approved peripherals that report specific properties in their firmware.
Prevent installation of specifically prohibited peripheralsYou can't install or use prohibited peripherals that report specific properties in their firmware.
Allow installation and usage of specifically approved peripherals with matching device instance IDsYou can only install and use approved peripherals that match any of these device instance IDs.
Prevent installation and usage of specifically prohibited peripherals with matching device instance IDsYou can't install or use prohibited peripherals that match any of these device instance IDs.
Limit services that use BluetoothYou can limit the services that can use Bluetooth.
Use Microsoft Defender for Endpoint baseline settingsYou can set the recommended configuration for ATP by using the Defender for Endpoint security baseline.

Restrict USB drives and other peripherals

To prevent malware infections or data loss, an organization may restrict USB drives and other peripherals. The following table describes the ways Microsoft Defender for Endpoint can help prevent installation and usage of USB drives and other peripherals.

ControlDescription
Allow installation and usage of USB drives and other peripheralsAllow users to install only the USB drives and other peripherals included on a list of authorized devices or device types
Prevent installation and usage of USB drives and other peripheralsPrevent users from installing USB drives and other peripherals included on a list of unauthorized devices and device types
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All of the above controls can be set through the Intune Administrative Templates. The relevant policies are located here in the Intune Administrator Templates:

Note

Using Intune, you can apply device configuration policies to Azure AD user and/or device groups.The above policies can also be set through the Device Installation CSP settings and the Device Installation GPOs.

Note

Always test and refine these settings with a pilot group of users and devices first before applying them in production.For more information about controlling USB devices, see the Microsoft Defender for Endpoint blog.

Allow installation and usage of USB drives and other peripherals

One way to approach allowing installation and usage of USB drives and other peripherals is to start by allowing everything. Afterwards, you can start reducing the allowable USB drivers and other peripherals.

Note

Because an unauthorized USB peripheral can have firmware that spoofs its USB properties, we recommend only allowing specifically approved USB peripherals and limiting the users who can access them.

  1. Enable Prevent installation of devices not described by other policy settings to all users.
  2. Enable Allow installation of devices using drivers that match these device setup classes for all device setup classes.

To enforce the policy for already installed devices, apply the prevent policies that have this setting.

When configuring the allow device installation policy, you must allow all parent attributes as well. You can view the parents of a device by opening Device Manager and view by connection.

In this example, the following classes needed to be added: HID, Keyboard, and {36fc9e60-c465-11cf-8056-444553540000}. See Microsoft-provided USB drivers for more information.

If you want to restrict to certain devices, remove the device setup class of the peripheral that you want to limit. Then add the device ID that you want to add. Device ID is based on the vendor ID and product ID values for a device. For information on device ID formats, see Standard USB Identifiers.

To find the device IDs, see Look up device ID.

For example:

  1. Remove class USBDevice from the Allow installation of devices using drivers that match these device setup.
  2. Add the device ID to allow in the Allow installation of device that match any of these device IDs.

Prevent installation and usage of USB drives and other peripherals

If you want to prevent the installation of a device class or certain devices, you can use the prevent device installation policies:

  1. Enable Prevent installation of devices that match any of these device IDs and add these devices to the list.
  2. Enable Prevent installation of devices using drivers that match these device setup classes.

Note

The prevent device installation policies take precedence over the allow device installation policies.

The Prevent installation of devices that match any of these device IDs policy allows you to specify a list of devices that Windows is prevented from installing.

To prevent installation of devices that match any of these device IDs:

  1. Look up device ID for devices that you want Windows to prevent from installing.
  2. Enable Prevent installation of devices that match any of these device IDs and add the vendor or product IDs to the list.

Look up device ID

You can use Device Manager to look up a device ID.

  1. Open Device Manager.
  2. Click View and select Devices by connection.
  3. From the tree, right-click the device and select Properties.
  4. In the dialog box for the selected device, click the Details tab.
  5. Click the Property drop-down list and select Hardware Ids.
  6. Right-click the top ID value and select Copy.

For information about Device ID formats, see Standard USB Identifiers.

For information on vendor IDs, see USB members.

The following is an example for looking up a device vendor ID or product ID (which is part of the device ID) using PowerShell:

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The Prevent installation of devices using drivers that match these device setup classes policy allows you to specify device setup classes that Windows is prevented from installing.

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To prevent installation of particular classes of devices:

  1. Find the GUID of the device setup class from System-Defined Device Setup Classes Available to Vendors.
  2. Enable Prevent installation of devices using drivers that match these device setup classes and add the class GUID to the list.

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Block installation and usage of removable storage

  1. Sign in to the Microsoft Azure portal.

  2. Click Intune > Device configuration > Profiles > Create profile.

  3. Use the following settings:

    • Name: Type a name for the profile
    • Description: Type a description
    • Platform: Windows 10 and later
    • Profile type: Device restrictions

  4. Click Configure > General.

  5. For Removable storage and USB connection (mobile only), choose Block. Removable storage includes USB drives, whereas USB connection (mobile only) excludes USB charging but includes other USB connections on mobile devices only.

  6. Click OK to close General settings and Device restrictions.

  7. Click Create to save the profile.

Allow installation and usage of specifically approved peripherals

Peripherals that are allowed to be installed can be specified by their hardware identity. For a list of common identifier structures, see Device Identifier Formats. Test the configuration prior to rolling it out to ensure it blocks and allows the devices expected. Ideally test various instances of the hardware. For example, test multiple USB keys rather than only one.

For a SyncML example that allows installation of specific device IDs, see DeviceInstallation/AllowInstallationOfMatchingDeviceIDs CSP. To allow specific device classes, see DeviceInstallation/AllowInstallationOfMatchingDeviceSetupClasses CSP.Allowing installation of specific devices requires also enabling DeviceInstallation/PreventInstallationOfDevicesNotDescribedByOtherPolicySettings.

Prevent installation of specifically prohibited peripherals

Microsoft Defender for Endpoint blocks installation and usage of prohibited peripherals by using either of these options: Download nexus vst plugin for fl studio 11.

  • Administrative Templates can block any device with a matching hardware ID or setup class.
  • Device Installation CSP settings with a custom profile in Intune. You can prevent installation of specific device IDs or prevent specific device classes.

Allow installation and usage of specifically approved peripherals with matching device instance IDs

Peripherals that are allowed to be installed can be specified by their device instance IDs. Test the configuration prior to rolling it out to ensure it allows the devices expected. Ideally test various instances of the hardware. For example, test multiple USB keys rather than only one.

You can allow installation and usage of approved peripherals with matching device instance IDs by configuring DeviceInstallation/AllowInstallationOfMatchingDeviceInstanceIDs policy setting. Shogun total war product key generator.

Prevent installation and usage of specifically prohibited peripherals with matching device instance IDs

Peripherals that are prohibited to be installed can be specified by their device instance IDs. Test the configuration prior to rolling it out to ensure it allows the devices expected. Ideally test various instances of the hardware. For example, test multiple USB keys rather than only one.

You can prevent installation of the prohibited peripherals with matching device instance IDs by configuring DeviceInstallation/PreventInstallationOfMatchingDeviceInstanceIDs policy setting.

Limit services that use Bluetooth

Using Intune, you can limit the services that can use Bluetooth through the 'Bluetooth allowed services'. The default state of 'Bluetooth allowed services' settings means everything is allowed. As soon as a service is added, that becomes the allowed list. If the customer adds the Keyboards and Mice values, and doesn’t add the file transfer GUIDs, file transfer should be blocked.

Use Microsoft Defender for Endpoint baseline settings

The Microsoft Defender for Endpoint baseline settings represent the recommended configuration for ATP. Configuration settings for baseline are located in the edit profile page of the configuration settings.

Prevent threats from removable storage

Removable storage devices can introduce additional security risk to your organization. Microsoft Defender for Endpoint can help identify and block malicious files on removable storage devices.

Microsoft Defender for Endpoint can also prevent USB peripherals from being used on devices to help prevent external threats. It does this by using the properties reported by USB peripherals to determine whether or not they can be installed and used on the device.

Note that if you block USB devices or any other device classes using the device installation policies, connected devices, such as phones, can still charge.

Note

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Always test and refine these settings with a pilot group of users and devices first before widely distributing to your organization.

The following table describes the ways Microsoft Defender for Endpoint can help prevent threats from removable storage.

For more information about controlling USB devices, see the Microsoft Defender for Endpoint blog.

ControlDescription
Enable Microsoft Defender Antivirus ScanningEnable Microsoft Defender Antivirus scanning for real-time protection or scheduled scans.
Block untrusted and unsigned processes on USB peripheralsBlock USB files that are unsigned or untrusted.
Protect against Direct Memory Access (DMA) attacksConfigure settings to protect against DMA attacks.

Note

Because an unauthorized USB peripheral can have firmware that spoofs its USB properties, we recommend only allowing specifically approved USB peripherals and limiting the users who can access them.

Enable Microsoft Defender Antivirus Scanning

Protecting authorized removable storage with Microsoft Defender Antivirus requires enabling real-time protection or scheduling scans and configuring removable drives for scans.

  • If real-time protection is enabled, files are scanned before they are accessed and executed. The scanning scope includes all files, including those on mounted removable devices such as USB drives. 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. However, we recommend enabling real-time protection for improved scanning performance, especially for large storage devices.
  • If scheduled scans are used, then you need to disable the DisableRemovableDriveScanning setting (enabled by default) to scan the removable device during a full scan. Removable devices are scanned during a quick or custom scan regardless of the DisableRemovableDriveScanning setting.

Note

We recommend enabling real-time monitoring for scanning. In Intune, you can enable real-time monitoring for Windows 10 in Device Restrictions > Configure > Microsoft Defender Antivirus > Real-time monitoring.

Block untrusted and unsigned processes on USB peripherals

End-users might plug in removable devices that are infected with malware.To prevent infections, a company can block USB files that are unsigned or untrusted.Alternatively, companies can leverage the audit feature of attack surface reduction rules to monitor the activity of untrusted and unsigned processes that execute on a USB peripheral.This can be done by setting Untrusted and unsigned processes that run from USB to either Block or Audit only, respectively.With this rule, admins can prevent or audit unsigned or untrusted executable files from running from USB removable drives, including SD cards.Affected file types include executable files (such as .exe, .dll, or .scr) and script files such as a PowerShell (.ps), VisualBasic (.vbs), or JavaScript (.js) files.

These settings require enabling real-time protection.

  1. Sign in to the Microsoft Azure portal.

  2. Click Intune > Device configuration > Profiles > Create profile.

  3. Use the following settings:

    • Name: Type a name for the profile
    • Description: Type a description
    • Platform: Windows 10 or later
    • Profile type: Endpoint protection

  4. Click Configure > Windows Defender Exploit Guard > Attack Surface Reduction.

  5. For Unsigned and untrusted processes that run from USB, choose Block.

  6. Click OK to close Attack Surface Reduction, Windows Defender Exploit Guard, and Endpoint protection.

  7. Click Create to save the profile.

Protect against Direct Memory Access (DMA) attacks

DMA attacks can lead to disclosure of sensitive information residing on a PC, or even injection of malware that allows attackers to bypass the lock screen or control PCs remotely. The following settings help to prevent DMA attacks:

  1. Beginning with Windows 10 version 1803, Microsoft introduced Kernel DMA Protection for Thunderbolt to provide native protection against DMA attacks via Thunderbolt ports. Kernel DMA Protection for Thunderbolt is enabled by system manufacturers and cannot be turned on or off by users.

    Beginning with Windows 10 version 1809, you can adjust the level of Kernel DMA Protection by configuring the DMA Guard CSP. This is an additional control for peripherals that don't support device memory isolation (also known as DMA-remapping). Memory isolation allows the OS to leverage the I/O Memory Management Unit (IOMMU) of a device to block unallowed I/O, or memory access, by the peripheral (memory sandboxing). In other words, the OS assigns a certain memory range to the peripheral. If the peripheral attempts to read/write to memory outside of the assigned range, the OS blocks it.

    Peripherals that support device memory isolation can always connect. Peripherals that don't can be blocked, allowed, or allowed only after the user signs in (default).

  2. On Windows 10 systems that do not support Kernel DMA Protection, you can:

Create customized alerts and response actions

You can create custom alerts and response actions with the WDATP Connector and the custom detection rules:

Wdatp Connector response Actions:

Investigate: Initiate investigations, collect investigation package, and isolate a machine.

Threat Scanning on USB devices.

Restrict execution of all applications on the machine except a predefined setMDATP connector is one of over 200 pre-defined connectors including Outlook, Teams, Slack, etc. Custom connectors can be built.

Custom Detection Rules Response Action:Both machine and file level actions can be applied.

For information on device control related advance hunting events and examples on how to create custom alerts, see Advanced hunting updates: USB events, machine-level actions, and schema changes.

Respond to threats

You can create custom alerts and automatic response actions with the Microsoft Defender for Endpoint Custom Detection Rules. Response actions within the custom detection cover both machine and file level actions. You can also create alerts and automatic response actions using PowerApps and Flow with the Microsoft Defender for Endpoint connector. The connector supports actions for investigation, threat scanning, and restricting running applications. It is one of over 200 pre-defined connectors including Outlook, Teams, Slack, and more. Custom connectors can also be built. See Connectors to learn more about connectors.

For example, using either approach, you can automatically have the Microsoft Defender Antivirus run when a USB device is mounted onto a machine.

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