Microsoft is rolling out updates for Windows Defender to protect users from newly discovered malware threats. These updates occur frequently, with a significant refresh every three months for Windows installation images (WIM and VHD) and ISOs. The recent Windows 11 update includes the latest definitions and addresses vulnerabilities from outdated anti-malware definitions in installation images. The latest security definitions were delivered through security intelligence update version 1.445.323.0, applicable to various platforms, including Windows 11 and several Windows Server versions. The update enhances the anti-malware client, engine, and signature versions to platform version 4.18.26040.7, engine version 1.1.26040.8, and security intelligence version 1.447.236.0. The most recent intelligence update is version 1.451.297.0, which improves threat detection against various malware types.