Microsoft Defender Package for Windows Install-image Updates

[German]Microsoft has released a PowerShell script package that allows installation images of Windows 10 and Windows Server to already have an updated Microsoft Defender. This should reduce the vulnerability of a new installation.


The problem: New Windows installations

In the first few hours after installing a Windows operating system, a protection gap in Microsoft Defender may occur. The installation images used to set up a Windows installation contain outdated anti-malware files. It takes time to obtain Malware definitions and updates via the Internet. These newly installed devices are not optionally protected until the first Anti-Malware software update is completed.

The solution: Updated image files

Regularly updating the operating system installation image data with fresh Microsoft Defender binaries minimizes this vulnerability in new installations. Bleeping Computer has spotted the new article Microsoft Defender update for Windows Operating System installation Images. This article describes the anti-malware update package to integrate the Microsoft Defender in the operating system installation images (WIM or VHD files) in the latest version. This feature supports the following operating system installation images:

  • Windows 10 (Enterprise, Pro, Home)
  • Windows Server 2019
  • Windows Server 2016

This package updates the Anti-Malware client, Anti-Malware engine and signature versions in the operating system installation images of the named operating system. The package size is about 110 MB, the current versions of the Microsoft Defender components are mentioned in the article. The package contains monthly updates and fixes for the Microsoft Defender antimalware platform and engine used by Microsoft Defender Antivirus in Windows 10. This package also includes the latest Security Intelligence update that is available through the release date.

Microsoft Defender update for the installation image of the Windows operating system: 32-bit | 64-bit

To run this patching tool (DefenderUpdateWinImage.ps1) you need a 64-bit Windows 10 with PowerShell 5.1 or higher. The Microsoft.Powershell.Security and DISM modules must be installed. The article Microsoft Defender update for Windows Operating System installation Images aufgefallen explains how to install the update via PowerShell and how to reset it if necessary.


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