Security Insights
Latest threat analysis, industry news, and security best practices from our expert team.
Microsoft Defender ISOC and the Agentic SOC: A Defender's Playbook for Adopting AI-Driven Security Operations Safely
Introduction On September 23, 2026, Microsoft announced ISOC in Microsoft Defender — a foundational re-architecture of the security operatio...
BigDiskBuster PoC Blocks Microsoft Defender Updates via Disk Exhaustion — Detection and Mitigation Guide
Introduction On September 19, 2026, security researcher Abdelhamid Naceri published a proof-of-concept tool called BigDiskBuster on GitHub t...
Microsoft Defender Update-Blocking Flaw Disclosed by Nightmare Eclipse — Detection, Monitoring, and Hardening Guide
Introduction Over the weekend, security researcher Abdelhamid Naceri — known in the community as Nightmare Eclipse — publicly released detai...
Microsoft Fixes False 'Defender Antivirus Is Turned Off' Alerts — How to Validate Real AV Tampering vs. Bug Noise
Introduction Microsoft has resolved a known issue that caused Windows to incorrectly warn users and administrators that Microsoft Defender A...
ShieldCrash PoC: Unpatched Microsoft Defender Arbitrary File Read as SYSTEM — Detection and Hardening Guide
Introduction Security researcher Chaotic Eclipse (also tracked under the aliases INFINITE NIGHTMARE, MSNightmare, and Nightmare-Eclipse) has...
ShieldCrash Unpatched Microsoft Defender Privilege Escalation: Detection, Hardening, and Response Guide
ShieldCrash Unpatched Microsoft Defender Privilege Escalation: Detection, Hardening, and Response Guide SecurityWeek reports a new unpatched...
Microsoft Defender 'ShieldCrash' Unpatched Privilege Escalation — Detection and Mitigation Guide
What Happened Immediately after Microsoft shipped its September 2026 Patch Tuesday updates, an anonymous researcher operating under the hand...
Microsoft Defender BTR.sys Weaponization: Detection and Hardening Guide for the Boot-Time Removal Tool Abuse Technique
Introduction Check Point Research has disclosed a technique that turns Microsoft Defender against itself. Defender ships a legitimately Micr...
MacSync Stealer: Hunting macOS Infostealer C2 Infrastructure with Behavioral Pivots — Detection and Response Guide
Introduction Microsoft's threat hunting team just published a case study that every SOC should read and operationalize: MacSync Stealer, a m...