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Microsoft released important Defender update for Windows 10/11/Server install images

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Microsoft today released Patch Tuesday updates for June 2024. We have covered them in their dedicated articles here: Windows 11 (KB5039212 / KB5039213) and Windows 10 (KB5039211 / KB5039217 / KB5039214 / KB5039225).

In the meantime, the company also published a new Defender anti-malware update package for Windows OS installation images, i.e., Windows Imaging Format (WIM) and VHD (Virtual Hard Disk) formats. The latest definitions support Windows 11, all editions of Windows 10, and Windows Servers 2016 and 2019. This update package is necessary as a Windows installation image may contain old, outdated anti-malware definitions and software binaries. Aside from better security, these updates can also provide improved performance benefits in some cases.

Microsoft is delivering the latest security definitions for Windows images via security intelligence update version 1.411.111.0. The Defender package version is 1.411.111.0. In the support document describing the new update, Microsoft explains:

The first hours of a newly installed Windows deployment can leave the system vulnerable because of a Microsoft Defender protection gap. This is because the OS installation images may contain outdated antimalware software binaries.

[..] Devices using either the Windows built-in antivirus or another security solution can benefit from these updates.

[..] This article describes antimalware update package for Microsoft Defender in the OS installation images (WIM and VHD files). This feature supports the following OS installation images:

  • Windows 11
  • Windows 10 (Enterprise, Pro, and Home editions)
  • Windows Server 2022
  • Windows Server 2019
  • Windows Server 2016

Version information

  • Defender package version: 1.411.111.0

This package updates the anti-malware client, anti-malware engine, and signature versions in the OS installation images to following versions:

  • Platform version: 4.18.24050.7
  • Engine version: 1.1.24050.2
  • Security intelligence version: 1.411.111.0

From Microsoft's security bulletin, we learn that the security intelligence update version 1.411.111.0 was released last month. It adds threat detections for various trojans, adware, and backdoor exploits, among others. For those wondering, the latest intelligence update is version 1.413.230.0 at the time of writing.

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