Use a Windows Defender Application Control policy to control specific plug-ins, add-ins, and modules

Applies to:

  • Windows 10
  • Windows Server 2016

As of Windows 10, version 1703, you can use WDAC policies not only to control applications, but also to control whether specific plug-ins, add-ins, and modules can run from specific apps (such as a line-of-business application or a browser):

Approach (as of Windows 10, version 1703) Guideline
You can work from a list of plug-ins, add-ins, or modules that you want only a specific application to be able to run. Other applications would be blocked from running them. Use New-CIPolicyRule with the -AppID option.
In addition, you can work from a list of plug-ins, add-ins, or modules that you want to block in a specific application. Other applications would be allowed to run them. Use New-CIPolicyRule with the -AppID and -Deny options.

To work with these options, the typical method is to create a policy that only affects plug-ins, add-ins, and modules, then merge it into your ‘master’ policy (merging is described in the next section).

For example, to create a WDAC policy that allows addin1.dll and addin2.dll to run in ERP1.exe, your organization’s enterprise resource planning (ERP) application, but blocks those add-ins in other applications, run the following commands. Note that in the second command, += is used to add a second rule to the $rule variable:

$rule = New-CIPolicyRule -DriverFilePath '.\temp\addin1.dll' -Level FileName -AppID '.\ERP1.exe'
$rule += New-CIPolicyRule -DriverFilePath '.\temp\addin2.dll' -Level FileName -AppID '.\ERP1.exe'
New-CIPolicy -Rules $rule -FilePath ".\AllowERPAddins.xml" -UserPEs

As another example, to create a WDAC policy that blocks addin3.dll from running in Microsoft Word, run the following command. You must include the -Deny option to block the specified add-ins in the specifed application:

$rule = New-CIPolicyRule -DriverFilePath '.\temp\addin3.dll' -Level FileName -Deny -AppID '.\winword.exe'
New-CIPolicy -Rules $rule -FilePath ".\BlockAddins.xml" -UserPEs