Microsoft Defender Receives Anti-Malware Update for New Windows Installation ISOs


A Microsoft has published a new anti-malware update for Defend protect the latest Windows installation ISO images Windows 11 22H2 and Windows 10 22H2, which have their security mechanisms based on Patch Tuesday of May.

According to the company, the Defender’s new anti-malware update package is 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. Microsoft has highlighted that this new package is necessary to keep antimalware definitions and software binaries up to date.


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

In addition to better security, these updates may also provide improved performance benefits in some cases. The new version of Defender made available by Microsoft is 20230604.1. Check out more details below:


  • After the release of a new version of the package, support for the previous two versions will be reduced to technical support only.

  • Versions earlier than two previous versions will no longer be supported.

  • Defender package version: 20230604.1

This package updates the antimalware client, antimalware engine, and signature versions in operating system installation images to the following versions:

  • Platform version: 4.18.23050.3

  • Engine version: 1.1.23050.3

  • Security Intelligence Version: 1.391.476.0

package information

The build size is approximately:

  • ARM64: 74 MB

  • X86: 126MB

  • X64: 129 MB

Known issues in this update