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  • Microsoft Graph and PowerShell

    December 10, 2019 by

    This is a post about using PowerShell and Microsoft Graph to access data in Azure AD, Intune and Office 365. The GUI management of these Microsoft 365 technologies is constantly evolving, but there will always be things that can’t be done that way. Microsoft Graph approaches the problem from the other direction. It provides an… Read more

  • MDAC and Signers

    December 3, 2019 by

    Signers are the identities of the certificates used by Microsoft Defender Application Control (MDAC) to allow or deny a signed file to run. If you open a policy XML file, you will see the list of signers. It is interesting that many of the files allowed to run by this method are not, in fact,… Read more

  • MDAC and File Types

    December 1, 2019 by

    When we implement a Microsoft Defender Application Control (MDAC) policy, we need to allow or deny different types of executable file. Different methods of creating a policy handle file types differently. This post is an attempt to explain how it works in practice.

  • MDAC FilePath Rules and Drivers

    November 29, 2019 by

    The new File Path rules in Microsoft Defender Application Control (MDAC) allow EXE and DLL files in the path, but not SYS, or MSI or script files. This is curious and, as far as I know, undocumented. And it means that we cannot simply allow all files in C:\Windows. If we do that, the system… Read more

  • MDAC or WDAC

    November 28, 2019 by

    The Application Control feature in Windows 10 was originally called Device Guard Code Integrity. This was brought under the Defender umbrella of security technologies as Windows Defender Application Control (WDAC). Microsoft earlier this year announced that Windows Defender would become cross-platform (with a version of Defender antivirus for macOS) and be renamed Microsoft Defender. In… Read more

  • Set MDAC Policy Options

    November 19, 2019 by

    A Microsoft Defender Application Control (MDAC) policy uses Options to control aspects of how it works. The options are binary choices: Enabled or Disabled; Required or Not Required. This post explains the choices.

  • Merge MDAC Policies

    November 18, 2019 by

    In a previous post I described creating an MDAC policy with the new file path rules. But this, alone, would not be enough for a desktop. We need to add rules to allow other files to run. To get a complete policy ready for production, we need to merge the file path rules with other… Read more

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