Microsoft Defender

Microsoft Defender helps prevent, detect, and respond to attacks across devices, identities, apps, email, data, workloads, and clouds. Explore threat intelligence, capabilities, and real-world guidance to help you get more out of Defender.

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Modernize your Security Operations Center with Microsoft Sentinel

Microsoft Sentinel is a cloud-native SIEM solution powered by AI and automation that delivers intelligent security analytics across your entire enterprise.

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April 1

16 min read

Mitigating the Axios npm supply chain compromise

On March 31, 2026, the popular HTTP client Axios experienced a supply chain attack, causing two newly published npm packages for version updates to download from command and control (C2) that Microsoft Threat Intelligence has attributed to the North Korean state actor Sapphire Sleet.
March 27

7 min read

How Microsoft Defender protects high-value assets in real-world attack scenarios

High-value assets including domain controllers, web servers, and identity infrastructure are frequent targets in sophisticated attacks.
March 24

9 min read

Guidance for detecting, investigating, and defending against the Trivy supply chain compromise

Threat actors abused trusted Trivy distribution channels to inject credential‑stealing malware into CI/CD pipelines worldwide.
March 23

7 min read

Case study: How predictive shielding in Defender stopped GPO-based ransomware before it started

Microsoft Defender stopped a human-operated ransomware attack that abused Group Policy Objects (GPOs) to disable defenses and push encryption at scale.
Tailored AI insights from Microsoft Security Copilot

Empower your defenders to detect hidden patterns, harden defenses, and respond to incidents faster with generative AI.

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March 20

9 min read

Secure agentic AI end-to-end

In this agentic era, security must be woven into, and around, every layer of the AI estate.
March 19

14 min read

When tax season becomes cyberattack season: Phishing and malware campaigns using tax-related lures

During tax season, threat actors reliably take advantage of the urgency and familiarity of time-sensitive emails, including refund notices, payroll forms, filing reminders, and requests from tax professionals, to push malicious attachments, links, or QR codes.
March 12

9 min read

Storm-2561 uses SEO poisoning to distribute fake VPN clients for credential theft

Storm-2561 uses SEO poisoning to push fake VPN downloads that install signed trojans and steal VPN credentials.
March 12

4 min read

From transparency to action: What the latest Microsoft email security benchmark reveals

The latest Microsoft benchmarking data reveals how Microsoft Defender mitigates modern email threats compared to SEG and ICES vendors.
Go beyond data protection with Microsoft Purview

Govern, protect, and manage all of your data with Microsoft Purview, comprehensive solutions to help give you better visibility and control.

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March 11

10 min read

Contagious Interview: Malware delivered through fake developer job interviews

The Contagious Interview campaign weaponizes job recruitment to target developers.
March 9

6 min read

Secure agentic AI for your Frontier Transformation

We are announcing the next step to make Frontier Transformation real for customers across every industry with Wave 3 of Microsoft 365 Copilot, Microsoft Agent 365, and Microsoft 365 E7: The Frontier Suite.
March 6

21 min read

AI as tradecraft: How threat actors operationalize AI

Threat actors are operationalizing AI to scale and sustain malicious activity, accelerating tradecraft and increasing risk for defenders, as illustrated by recent activity from North Korean groups such as Jasper Sleet and Coral Sleet (formerly Storm-1877).
March 5

6 min read

Malicious AI Assistant Extensions Harvest LLM Chat Histories

Malicious AI browser extensions collected LLM chat histories and browsing data from platforms such as ChatGPT and DeepSeek.