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Windows 11's security app is getting a makeover, but users may have to wait a while before the changes reach everyone.

Microsoft Learn: Refreshed Windows Security experience We’re rolling out a refreshed Windows Security experience with version 1000.29680.0.1000 that more closely aligns with the design of Windows 11 ...

TL;DR The Trellix Threat Response Team uncovered a multistage attack that uses fake FedEx tax invoices in Korean to deploy the Sirius Backdoor. Inside an attached ZIP archive, a blank PDF triggers an in-memory PowerShell chain that blinds endpoint sensors and hollows legitimate Windows processes. Furthermore, this fileless Sirius Backdoor drops a custom Windows provisioning package so the malware can survive a full operating system reset.

TL;DR The Trellix Threat Response Team uncovered a multistage attack that uses fake FedEx tax invoices in Korean to deploy the Sirius Backdoor. Inside an attached ZIP archive, a blank PDF triggers an in-memory PowerShell chain that blinds endpoint sensors and hollows legitimate Windows processes. Furthermore, this fileless Sirius Backdoor drops a custom Windows provisioning package so the malware can survive a full operating system reset.

The Microsoft Incident Response team recently published technical guidance detailing the mechanics of Windows 11 Prefetch files. Contrary to persistent system optimization myths, deleting these cached records does not accelerate operating systems. In fact, purging these files directly slows application launch times. Therefore, users who routinely clear this folder introduce unnecessary operational friction. How Windows Prefetch Accelerates Program Execution The operating system stores Prefetch files inside the dedicated C:\Windows\Prefetch\ directory.

Microsoft fixed more than 1,400 vulnerabilities in October 2026. Five examples explain the risks and how IT teams can prioritize, deploy and verify fixes.

Microsoft has confirmed that the KB5127648 update for Windows 11 grays out Smart App Control for users who had turned it off.

Learn what the Microsoft August 2026 security update fixes, 398 flaws including a zero-day exploit. Find affected Windows versions and how to install the patch.

Older hardware configs can have compatibility issues with Secure Boot and dual-booting a secondary operating system like Linux is difficult with it turned on.

A cloud file within Windows masquerades beautifully as a conventional document residing on your local disk. However, beneath this seamless transparency, complex code operates with formidable kernel privileges. Recently, Cisco Talos meticulously detailed a critical vulnerability, designated CVE-2026-80093 in the Windows Cloud Files Mini Filter Driver. This indispensable component expertly manages cloud stubs, intricate synchronizations, and sophisticated on-demand file loading.

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