Setting Edge as the default browser using Intune

This series of posts is an approach to implementing Intune inside a business. So far, I have covered off:

Now that Microsoft Edge has been secured in the environment, the next task will be to set Microsoft Edge as the default browser. There are number of ways of achieving this, but I’ll use the more modern Intune Settings catalog approach.

The first step in the process is to take a machine that already has Microsoft Edge configured as the default browser app and run the command:

dism /online /export-defaultappassociations:edgedefault.xml

This will produce an XML with all the application defaults for that device.

If you just want to configure Microsoft Edge as the default browser you’ll need to edit the XML file until it looks something like this:

<?xml version=”1.0″ encoding=”UTF-8″?>
<DefaultAssociations>
     <Association Identifier=”.htm” ProgId=”MSEdgeHTM” ApplicationName=”Microsoft Edge” />
     <Association Identifier=”.html” ProgId=”MSEdgeHTM” ApplicationName=”Microsoft Edge” />
     <Association Identifier=”.mht” ProgId=”MSEdgeMHT” ApplicationName=”Microsoft Edge” />
     <Association Identifier=”.mhtml” ProgId=”MSEdgeMHT” ApplicationName=”Microsoft Edge” />
     <Association Identifier=”.pdf” ProgId=”MSEdgePDF” ApplicationName=”Microsoft Edge” />
     <Association Identifier=”.svg” ProgId=”MSEdgeHTM” ApplicationName=”Microsoft Edge” />
     <Association Identifier=”.xht” ProgId=”MSEdgeHTM” ApplicationName=”Microsoft Edge” />
     <Association Identifier=”.xhtml” ProgId=”MSEdgeHTM” ApplicationName=”Microsoft Edge” />
     <Association Identifier=”ftp” ProgId=”MSEdgeHTM” ApplicationName=”Microsoft Edge” />
     <Association Identifier=”http” ProgId=”MSEdgeHTM” ApplicationName=”Microsoft Edge” />
     <Association Identifier=”https” ProgId=”MSEdgeHTM” ApplicationName=”Microsoft Edge” />
     <Association Identifier=”microsoft-edge” ProgId=”MSEdgeHTM” ApplicationName=”Microsoft Edge” />
     <Association Identifier=”microsoft-edge-holographic” ProgId=”MSEdgeHTM” ApplicationName=”Microsoft Edge” />
     <Association Identifier=”ms-xbl-3d8b930f” ProgId=”MSEdgeHTM” ApplicationName=”Microsoft Edge” />
     <Association Identifier=”read” ProgId=”MSEdgeHTM” ApplicationName=”Microsoft Edge” />
</DefaultAssociations>

Next, you’ll need to convert that XML file to a base64 file for us an Intune policy. You can do that using the following site:

https://www.base64encode.org/

The output from this conversion should look like this:

PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0iVVRGLTgiPz4NCjxEZWZhdWx0QXNzb2NpYXRpb25zPg0KCTxBc3NvY2lhdGlvbiBJZGVudGlmaWVyPSIuaHRtIiBQcm9nSWQ9Ik1TRWRnZUhUTSIgQXBwbGljYXRpb25OYW1lPSJNaWNyb3NvZnQgRWRnZSIgLz4NCgk8QXNzb2NpYXRpb24gSWRlbnRpZmllcj0iLmh0bWwiIFByb2dJZD0iTVNFZGdlSFRNIiBBcHBsaWNhdGlvbk5hbWU9Ik1pY3Jvc29mdCBFZGdlIiAvPg0KCTxBc3NvY2lhdGlvbiBJZGVudGlmaWVyPSIubWh0IiBQcm9nSWQ9Ik1TRWRnZU1IVCIgQXBwbGljYXRpb25OYW1lPSJNaWNyb3NvZnQgRWRnZSIgLz4NCgk8QXNzb2NpYXRpb24gSWRlbnRpZmllcj0iLm1odG1sIiBQcm9nSWQ9Ik1TRWRnZU1IVCIgQXBwbGljYXRpb25OYW1lPSJNaWNyb3NvZnQgRWRnZSIgLz4NCgk8QXNzb2NpYXRpb24gSWRlbnRpZmllcj0iLnBkZiIgUHJvZ0lkPSJNU0VkZ2VQREYiIEFwcGxpY2F0aW9uTmFtZT0iTWljcm9zb2Z0IEVkZ2UiIC8+DQoJPEFzc29jaWF0aW9uIElkZW50aWZpZXI9Ii5zdmciIFByb2dJZD0iTVNFZGdlSFRNIiBBcHBsaWNhdGlvbk5hbWU9Ik1pY3Jvc29mdCBFZGdlIiAvPg0KCTxBc3NvY2lhdGlvbiBJZGVudGlmaWVyPSIueGh0IiBQcm9nSWQ9Ik1TRWRnZUhUTSIgQXBwbGljYXRpb25OYW1lPSJNaWNyb3NvZnQgRWRnZSIgLz4NCgk8QXNzb2NpYXRpb24gSWRlbnRpZmllcj0iLnhodG1sIiBQcm9nSWQ9Ik1TRWRnZUhUTSIgQXBwbGljYXRpb25OYW1lPSJNaWNyb3NvZnQgRWRnZSIgLz4NCgk8QXNzb2NpYXRpb24gSWRlbnRpZmllcj0iZnRwIiBQcm9nSWQ9Ik1TRWRnZUhUTSIgQXBwbGljYXRpb25OYW1lPSJNaWNyb3NvZnQgRWRnZSIgLz4NCgk8QXNzb2NpYXRpb24gSWRlbnRpZmllcj0iaHR0cCIgUHJvZ0lkPSJNU0VkZ2VIVE0iIEFwcGxpY2F0aW9uTmFtZT0iTWljcm9zb2Z0IEVkZ2UiIC8+DQoJPEFzc29jaWF0aW9uIElkZW50aWZpZXI9Imh0dHBzIiBQcm9nSWQ9Ik1TRWRnZUhUTSIgQXBwbGljYXRpb25OYW1lPSJNaWNyb3NvZnQgRWRnZSIgLz4NCgk8QXNzb2NpYXRpb24gSWRlbnRpZmllcj0ibWljcm9zb2Z0LWVkZ2UiIFByb2dJZD0iTVNFZGdlSFRNIiBBcHBsaWNhdGlvbk5hbWU9Ik1pY3Jvc29mdCBFZGdlIiAvPg0KCTxBc3NvY2lhdGlvbiBJZGVudGlmaWVyPSJtaWNyb3NvZnQtZWRnZS1ob2xvZ3JhcGhpYyIgUHJvZ0lkPSJNU0VkZ2VIVE0iIEFwcGxpY2F0aW9uTmFtZT0iTWljcm9zb2Z0IEVkZ2UiIC8+DQoJPEFzc29jaWF0aW9uIElkZW50aWZpZXI9Im1zLXhibC0zZDhiOTMwZiIgUHJvZ0lkPSJNU0VkZ2VIVE0iIEFwcGxpY2F0aW9uTmFtZT0iTWljcm9zb2Z0IEVkZ2UiIC8+DQoJPEFzc29jaWF0aW9uIElkZW50aWZpZXI9InJlYWQiIFByb2dJZD0iTVNFZGdlSFRNIiBBcHBsaWNhdGlvbk5hbWU9Ik1pY3Jvc29mdCBFZGdlIiAvPg0KPC9EZWZhdWx0QXNzb2NpYXRpb25zPg==

In the Intune console, create a new Device Configuration profile using the Settings Catalog:

Give the new policy a meaningful name and continue.

In the Settings picker search for applications and then select Application defaults and then Default Associations Configuration in the results as shown above.

Into the option Default Associations Configuration paste a copy of the base64 file you created from the original XML.

Complete the policy by assigning it to a group of devices NOT users. This is because the Policy CSP – ApplicationDefaults is only scoped to devices per:

This may mean you need to create a different Edge configuration policy from the one created in previous steps, if that policy was assigned to users.

When the policy has been deployed from Intune, and the device rebooted, Microsoft Edge will be the default browser for the device.

Of course, the user can still change the default back but they will need to do that after every reboot. In the future, you’d create a policy to prevent that, but for now, if the user is that desperate for their old browser they can swap. However, the next policy I’ll cover will show you how to stop other browsers (or any other application) from running on Windows devices.

Setting an individual Attack Surface Reduction (ASR) rule in Intune

This series of posts is an approach to implementing Intune inside a business. So far, I have covered off:

1. Create compliance policies and update devices to be compliant

2. Implement LAPS to control the local device admin account that cannot be deleted

3. Remove all other accounts from local administrator group on devices

4. Setting the default search engine in Edge with Intune

5. Managing browser extensions in Edge with Intune

6. Setting an Edge Security Baseline with Intune

The next recommended setting to implement is Attack Surface Reduction (ASR) rules. I’ve detailed how you can set this on individual devices using PowerShell here:

Show ASR settings for device with PowerShell

I’ve also detailed how to do this with Intune previously:

Attack surface reduction for Windows 10

In a nutshell, ASR is going to prevent child processes from launching, which is typically how a malware infection starts.

To create a stand alone ASR rule navigate to Endpoint security, Attack surface reduction in the Intune portal and select Create policy, as shown above.

Select the platform as Windows 10, Windows 11 and Windows Server and the profile as Attack Surface Reduction Rules.

Then Create the policy

As always, give the policy a meaningful name.

You should then see a list of the 16 standard ASR rule types as well as a rule called Block Webshell creation for Severs.

The best practice is to set all of these to Block. However, you will also see options for Audit and Warn if you want to take a more cautious approach.

The good thing about an individual ASR policy like this is that you get a lot more options that can be configured, unlike other policies in Intune that also include ASR. An example if the above, where you can provide enter a directory or file which will prevent ASR rules from matching. As an example, a path might be defined as: C:\Windows to exclude all files in this directory. A fully qualified resource name might be defined as: C:\Windows\App.exe.

Best practice is not to have any exclusions.

A little further down you’ll see a setting for Enable Controlled Folder Access as shown above. The controlled folder access feature removes modify and delete permissions from untrusted applications to certain folders such as My Documents.

Best Practice is to set this to Enabled.

Under this you can set Controlled Folder Access Protected Folders and Controlled Folder Access Allowed Applications. Controlled Folder Access Protected Folder allows adding user-specified folder locations to the controlled folder access feature. These folders will complement the system defined folders such as My Documents and My Pictures. The Controlled Folder Access Allowed Applications allows user-specified applications to the controlled folder access feature. Adding an allowed application means the controlled folder access feature will allow the application to modify or delete content in certain folders such as My Documents. In most cases it will not be necessary to add entries. Windows Defender Antivirus will automatically detect and dynamically add applications that are friendly.

Best practice is to not have any settings here and to have these both set to Not configured.

When you configure an individual rule you’ll also see the ability to set exceptions for just this rule. As an example, a path might be defined as: c:\Windows to exclude all files in this directory. A fully qualified resource name might be defined as: C:\Windows\App.exe.

Once you have determined your settings you then apply the policy to an audience in your environment. You can use multiple policies if needed for different audiences.

If you want to monitor ASR actions in your environment you can use the following KQL query:

DeviceEvents
| where ActionType startswith ‘Asr’

This going to help you identify which devices and processes ASR is impacting, making troubleshooting much easier.

If you want to read more about ASR then visit:

Understand and use attack surface reduction capabilities

I believe ASR is something that should be enabled fully on all Windows devices, withou any exceptions or exclusions. It is an ability included with Windows for free and just needs to be enabled, either by policy or PowerShell. I would recommend setting an individual ASR policy as I have shown above as it provides the greatest flexibility when configuring as well as the greatest number of exclusions if required. Many other Intune policies include the ability to configure ASR but if you have a stand alone policy you should not configure it elsewhere or you may end up with configuration clashes and errors.

The next recommended policy will be for Defender for Endpoint.

Setting an Edge Security Baseline with Intune

This series of posts is an approach to implementing Intune inside a business. So far, I have covered off:

1. Create compliance policies and update devices to be compliant

2. Implement LAPS to control the local device admin account that cannot be deleted

3. Remove all other accounts from local administrator group on devices

4. Setting the default search engine in Edge with Intune

5. Managing browser extensions in Edge with Intune

The next step in the process is to assign a security baseline to the Microsoft Edge environment. Security baseline policies differ from all other policies in Intune because they already have best practice settings enabled. This compares to other Intune policies where you need to go into each policy item and set them to the desired setting. Another benefit of using Security baselines is that they are easily upgradable when updated policies become available. These two factors save a lot of time and effort securing your environment.

In the Intune console, navigate to Endpoint security | Security baselines and select Security Baseline for Microsoft Edge as shown.

Select the option to Create profile and then give the profile a meaningful name.

You’ll then see a list of the individual settings with values already selected.

You can adjust any of the individual settings if you need to customise the policy. Generally, I find there is no need to make any changes here as I have found no conflicts.

Here we also find an example of one of the challenging things with implementing any policy, duplicate settings. If you remember back to the previous article on

Managing browser extensions in Edge with Intune

you’ll note that extension restrictions was configured there, but now it is also in this Security baseline policy. A best practice recommendation is to only have one place in your policies where a setting is made. This will avoid conflicts and aid troubleshooting. If you do choose to retain the same settings in multiple policies, ensure they are set identically or otherwise you will get conflicts. In this case I’ll leave the setting in place for both policies as they are the same and it is bit challenging to disable just this option in the original ‘Edge configuration’ policy created in the previous post.

With any changes made, continue with the Security baseline policy configuration and assign it to your environment.

When complete you should see the policy you just created, as shown above. Remember, you can create as many policies as you need to accommodate your environment targeted to different audiences, however the aim should be to get to a single Security baseline policy for Edge to keep things simple.

You’ll see that the policy created has a version number. You’ll also note a Change version button on the menu at the top (currently greyed out) as shown above. This is the beauty of a Security baseline policy, when an update is available you’ll be able to use this option to update the policy. You can read more about this here:

Update a profile to the latest version

We are now at a point in our roll out where we have policies to provide a secure Microsoft Edge configuration in our environment. Those already using Microsoft Edge will benefit immediately, users on other browsers still need to ‘encouraged’ to make the shift as soon as possible, but are still not being forced to use Microsoft Edge just yet (they will be eventually, so keep encouraging them to make the shift with your communications because they day when they have no other option but to switch is coming!).

for more information about the:

Microsoft Edge security baseline settings reference for Microsoft Intune

visit the above link and remember the benefit of Security baselines is that they have best practice settings already enabled, so typically all that is needed to apply the policy with these default settings .

It is now time to look at securing the Windows devices against ransomware. Stay tuned.

Managing browser extensions in Edge with Intune

This series of posts is an approach to implementing Intune inside a business. So far, I have covered off:

1. Create compliance policies and update devices to be compliant

2. Implement LAPS to control the local device admin account that cannot be deleted

3. Remove all other accounts from local administrator group on devices

4. Setting the default search engine in Edge with Intune

The goal we are trying to achieve is to move all users from third party browsers to using Microsoft Edge. The next step in this process will be deploying and managing a constrained set of extensions in Microsoft Edge.

The first step is to visit the Microsoft Edge store for extensions and grab the unique ID for the extensions you want to use. You find this in the URL for the extension as shown above. Here are three common extensions I will use for this example:

Lastpass – bbcinlkgjjkejfdpemiealijmmooekmp

DuckDuckGo Privacy – caoacbimdbbljakfhgikoodekdnlcgpk

Save to Pocket – jicacccodjjgmghnmekophahpmddeemd

Once we have these we need to login to the Intune management portal.

In the last article I created a generic device configuration profile called ‘Edge configuration’ policy that I’ll be extending here. Select the policy name to view its settings.

Scroll down the policy until you locate the heading Configuration settings as shown above, and then select the Edit hyperlink to the right of this.

Select the + Add Settings link as shown above.

Expand the Microsoft Edge option in the top part of the blade that appears and then select Extensions as shown above. In the options that appear in the lower part of the screen select:

– Allow specific extensions to be installed

– Control which extensions are installed silently

– Control which extensions cannot be installed

Close the blade.

You should now see the ability to customise these options in the policy as shown above.

Add the ID’s of the extensions you want silently installed and ensure that each is ticked as shown.

Add ‘*’ (i.e. all) as the option for IDs to be prevented from being installed and ensure it is ticked as shown. Basically all other extensions will not be permitted to be installed.

Add the ID’s of the extensions you want to allow in the exempt from block area and ensure each is ticked as shown.

Save the policy changes and allow it to be propagated to all groups included in the policy.

Once the policy has rolled out, you should find the extensions you entered in the policy have been added to Microsoft Edge as shown above.

You should also find that users cannot add additional extensions to their Microsoft Edge browser as shown above.

The aim of this exercise was to automatically configure a number of ‘standard’ extensions for Microsoft Edge and block everything else. We have been able to achieve this by extending the original ‘Edge configuration’ policy that was created earlier.

The next step in the process will be to lock down the Microsoft Edge browser using a baseline policy. Stay tuned.

Controlling local user group membership with Intune

I recently outlined how to

Control local admin on a device with LAPS and Intune

Once you have LAPS in place I suggested that you want to eliminate any local device administrators as a best practice. You can achieve this via a policy in Intune.

The first step in the process is going to be to determine any local administrator accounts and what they are doing in your environment. A good starting point is this KQL query to look for local admin activity in your device fleet:

DeviceLogonEvents
| where TimeGenerated >= ago(7d)
| where IsLocalAdmin == true
| summarize count() by DeviceName, AccountName,LogonType
| sort by AccountName

That will, of course, only show you logon activity by an account that is a local administrator. For dormant local admin accounts you are going to need to do more work to flush them out. However, the query will at least show you active local admin accounts that maybe impacted by any changes made using something like LAPS.

To set a policy to control local groups on Windows devices, login to the Intune management portal and select Endpoint security and Account protection, as shown above. Create a new policy for Windows 10 and later and select Local user group membership as the Profile.

Give your policy a meaningful name and continue.

Select the local group (here Administrators), select the action (here Remove) and Manual for the User selection type.

When you select the Add users hyperlink in the Selected users/groups field you will see the above blade appear. In here, you’ll find a number of different methods of identifying users. If you have a list of local device admins then you can add them here.

Once you have entered all the users you wish to remove from the local device administrators group, complete the policy and assign it to the audience you wish.

The policy will then roll out to your environment and the changes will be made to the local group membership. In this case, it will remove local users from the local device administrator group so they can no longer administrate the device.

Remember, there are lots of options here. You could different policies for different users and/or devices. You could create policies to not only remove but also add. An example maybe where you wish an Entra ID user to be a local administrator of box. In that case, simply select the option to Add the user from Entra ID to the local administrators group. There is a lot of flexibility here with this policy.

Typically, once your policy has completed and there are no more local administrators you can remove the policy, as hopefully no more local accounts will be created with devices being joined directly to Entra ID. However, you may wish to retain it for if new devices are joined to your environment, especially if you don’t use Autopilot.

In summary then, the process so far, is:

1. Create compliance policies and update devices to be compliant

2. Implement LAPS to control the local device admin account that cannot be deleted

3. Remove all other accounts from local administrator group on devices

Typically, these steps will have no impact on users working with their devices and it commences the process of implementing a consistent environment and making it more secure.

You can read more about this particular policy here:

Manage local groups on Windows devices

Controlling local admin with LAPS and Intune

I recently suggested that Compliance policies were the place to start with Intune device management.

Start with Intune policies

From there, I would suggest that configuring the Local Administrator Password (LAPS) policy is a good follow on option. This will automatically rotate the password for the Windows local device administrator accounts.

In the Intune console select Endpoint Security and then Account protection. Create a new policy for Windows 10 and later and select Local admin password solution (Windows LAPS) as shown above.

Give the policy a meaning name and description.

Make the appropriate settings as shown above. You want to ensure that the Backup directory is set to Backup the password to Azure AD only.

Assign the policy and save it.

Once the policy has been assigned to the device a random password, to specifications set in the policy will be applied and a copy will be saved into the device details in the location shown above within Intune

In general it is best practice to have no other local admin accounts on devices except the default one provided by Windows that cannot be removed. Per the FAQs, LAPS supports only one account on a device. You can specify that account but it is best practice to not specify a name on the policy configuration and allow Intune to manage the default built-in administrator account.

Once the LAPS policy has been applied you will see the following for the Windows devices as shown above.

Selecting the Show local administrator password hyperlink will display a blade with the above information. Selecting the Show button here will display the current password and allow you to take a copy.

Best practice is to take control of the default local admin account using the LAPS policy deployed via Intune as shown. The next step would then to be to eliminate any other local admin account from the devices so the only ne left is the default which has its password rotated regularly thanks to LAPS.

Further information on LAPS with Intune can be found here:

Microsoft Intune support for Windows LAPS

Start with Intune Compliance policies

I see many people struggle to get started with Intune and Device Management in Microsoft 365. My recommendation is always to start with configuring Compliance policies. Doing so will give you:

1. A device inventory

2. A list of devices that fail to meet the minimum standards set for connection to corporate data

However, the major benefit is that, by default, Intune Compliance Policies make no change to any of the device or impact users productivity. In effect, Compliance Policies simply READ the status of a device and make NO changes.

You’ll find Compliance Policies under Devices in the Intune portal as shown above.

Typically, you’ll create at least one Compliance Policy for each different operating systems you have in your environment (i.e. for Windows, iOS, Android, etc). You can, of course, have as many different Compliance Policies as you desire, potentially targeted at different users and or devices. However, the policies you have, the more maintenance and troubleshooting will be required. It is therefore recommended to stick with a single Compliance Policy for each operating system.

During the policy creation you’ll see a screen as shown above in which you can set actions for devices that fail compliance. You will not that, by default, the only taken is simply to mark the devices as non compliant. That is the only action take. You can add more actions if you want, but importantly, by default, the only action taken is simply to mark devices as non compliant.

Once you have created and assigned the Compliance Policy the machines covered that policy will be evaluated and results reported back to Intune.

If devices are found that are not compliant, then you can take action to make them compliant before allowing them to access corporate data.

Above all, using compliance policies is a great way to get an inventory of all the devices in your environment and report their configuration. Of course, these Compliance Policies will continue to be evaluated regularly in case anything changes on the device.

The recommendation then is to start with Compliance Policies to take an inventory of your device fleet before proceeding further with Device management. If you want to read more about Modern Device Management then read my series of blog posts starting here:

https://blog.ciaops.com/2020/09/26/modern-device-management-with-microsoft-365-business-premium-part-1/

Need to Know podcast–Episode 309

All the latest news and updates from the Microsoft Cloud with a focus on SMB. Inside this episode are also some thoughts around incident response and why you should have one and why you should be reviewing and updating it regularly.

You can listen directly to this episode at:

https://ciaops.podbean.com/e/episode-309-incident-response/

Subscribe via iTunes at:

https://itunes.apple.com/au/podcast/ciaops-need-to-know-podcasts/id406891445?mt=2

Don’t forget to give the show a rating as well as send me any feedback or suggestions you may have for the show.

This episode was recorded using Microsoft Teams and produced with Camtasia 2023.

Brought to you by www.ciaopspatron.com

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