Microsoft Sentinel data lake: Unify signals, cut costs, and power agentic AI
We’re evolving our industry-leading Security Incidents and Event Management solution (SIEM), Microsoft Sentinel, to include a modern, cost-effective data lake.
Microsoft Security Blog
Your source for the latest in cybersecurity
Microsoft is named a Leader in the 2025 Gartner® Magic Quadrant™ for Endpoint Protection Platforms
We are honored to be recognized once again as a Leader in the 2025 Gartner® Magic Quadrant™ for Endpoint Protection Platforms—our sixth consecutive time.
Protecting customers from Octo Tempest attacks across multiple industries
To help protect and inform customers, Microsoft highlights protection coverage across the Microsoft Defender security ecosystem to protect against threat actors like Octo Tempest.
Jasper Sleet: North Korean remote IT workers’ evolving tactics to infiltrate organizations
Since 2024, Microsoft Threat Intelligence has observed remote IT workers deployed by North Korea leveraging AI to improve the scale and sophistication of their operations, steal data, and generate revenue for the North Korean government.
Threat intelligence
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Disrupting active exploitation of on-premises SharePoint vulnerabilities
Microsoft has observed two named Chinese nation-state actors, Linen Typhoon and Violet Typhoon, exploiting vulnerabilities targeting internet-facing SharePoint servers. -
Unveiling RIFT: Enhancing Rust malware analysis through pattern matching
As threat actors are adopting Rust for malware development, RIFT, an open-source tool, helps reverse engineers analyze Rust malware, solving challenges in the security industry. -
Defending against evolving identity attack techniques
Threat actors continue to develop and leverage various techniques that aim to compromise cloud identities. -
New Russia-affiliated actor Void Blizzard targets critical sectors for espionage
Microsoft Threat Intelligence has discovered a cluster of worldwide cloud abuse activity conducted by a threat actor we track as Void Blizzard, who we assess with high confidence is Russia-affiliated and has been active since at least April 2024. -
Lumma Stealer: Breaking down the delivery techniques and capabilities of a prolific infostealer
Over the past year, Microsoft Threat Intelligence observed the persistent growth and operational sophistication of Lumma Stealer, an info-stealing malware used by multiple financially motivated threat actors to target various industries. -
Marbled Dust leverages zero-day in Output Messenger for regional espionage
Since April 2024, the threat actor that Microsoft Threat Intelligence tracks as Marbled Dust has been observed exploiting user accounts that have not applied fixes to a zero-day vulnerability (CVE-2025-27920) in the messaging app Output Messenger, a multiplatform chat software.
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AI and machine learning
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Improving IT efficiency with Microsoft Security Copilot in Microsoft Intune and Microsoft Entra
Announcing the general availability of Microsoft Security Copilot capabilities for IT with Microsoft Intune and Microsoft Entra, offering AI-powered efficiency and enhanced security for your operations. -
Learn how to build an AI-powered, unified SOC in new Microsoft e-book
Read Coordinated Defense: Building an AI-powered, unified SOC, the new e-book on how organizations can unify security operations to better meet the challenges of today’s cyberthreat landscape. -
How to deploy AI safely
Microsoft Deputy CISO Yonatan Zunger shares tips and guidance for safely and efficiently implementing AI in your organization. -
The future of AI agents—and why OAuth must evolve
Our industry needs to continue working together on identity standards for agent access across systems. -
Microsoft extends Zero Trust to secure the agentic workforce
At Microsoft Build 2025, we’re taking important steps to secure the agentic workforce. -
14 secure coding tips: Learn from the experts at Microsoft Build
At Microsoft Build 2025, we’re bringing together security engineers, researchers, and developers to share practical tips and modern best practices to help you ship secure code faster.
Modernize your security operations center
Confidently secure your multicloud, multiplatform environment with Microsoft Sentinel – a cloud-native security information and event management (SIEM) solution.
Latest posts
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Microsoft at Black Hat USA 2025: A unified approach to modern cyber defense
Microsoft will spotlight its AI-first, end-to-end security platform at Black Hat USA 2025. -
Transparency on Microsoft Defender for Office 365 email security effectiveness
Microsoft believes in transparently sharing performance data from Microsoft Defender for Office 365, and other ecosystem providers, to help customers evaluate email security solutions and make decisions to layer for defense in depth. -
Forrester names Microsoft a Leader in the 2025 Zero Trust Platforms Wave™ report
Employing a Zero Trust strategy is an effective way to modernize security infrastructure to protect against ever evolving security challenges. -
Microsoft expands Zero Trust workshop to cover network, SecOps, and more
The Microsoft Zero Trust workshop has been expanded to cover all six pillars of Zero Trust security, providing a comprehensive guide for organizations to modernize their security posture. -
Enhancing Microsoft 365 security by eliminating high-privilege access
In this blog you will hear directly from Microsoft’s Deputy Chief Information Security Officer (CISO) for Experiences and Devices, Naresh Kannan, about eliminating high-privileged access across all Microsoft 365 applications. -
Planning your move to Microsoft Defender portal for all Microsoft Sentinel customers
Microsoft is transitioning Microsoft Sentinel into the Microsoft Defender portal to create a unified security operations experience.
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