You can get to the Azure portal and use the Automation Script and look for: 'publisher': '', You can check the configuration settings in different ways as follows:

Once the Antimalware extension is provisioned successfully. To enable Antimalware with a custom configuration, input the supported values for the configuration settings provided on the Install Extension blade, such as excluding file extensions and processes as shown in the figure below, and then click OK. Install Microsoft Antimalware for Azure Virtual Machines You can read more about this update here. The Azure VM Antimalware extension can still be added to a Windows Server 2016 and Windows Server 2019 Azure VM with Windows Defender, but in this scenario, the extension will apply any optional configuration policies to be used by Windows Defender, the extension will not deploy any additional Antimalware service. Windows Defender is the built-in Antimalware enabled in Windows Server 2016 and Windows Server 2019. The Microsoft Antimalware extension is supported on Windows Server 2008 R2, Windows Server 2012, and Windows Server 2012 R2 operating system families. The solution can be enabled and configured from the Azure Portal, Service Management REST API, and Microsoft Azure PowerShell cmdlets. Microsoft Antimalware for Azure Virtual Machines is a real-time protection capability that helps identify and remove viruses, spyware, and other malicious software, with configurable alerts when known malicious or unwanted software attempts to install itself or run on your system.

Update Microsoft Antimalware Policies Introduction.

Install Microsoft Antimalware for Azure Virtual Machines.

Azure antimalware extension