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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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.
March 11

10 min read

Contagious Interview: Malware delivered through fake developer job interviews

The Contagious Interview campaign weaponizes job recruitment to target developers.
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 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.
March 4

15 min read

Inside Tycoon2FA: How a leading AiTM phishing kit operated at scale

Tycoon2FA has become a leading phishing-as-a-service (PhaaS) platforms, enabling campaigns that reach over 500,000 organizations monthly, prompting Microsoft’s Digital Crimes Unit (DCU) to work with Europol and industry partners to facilitate a disruption of Tycoon2FA’s infrastructure and operations.
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 3

12 min read

Signed malware impersonating workplace apps deploys RMM backdoors

Signed malware backed by a stolen EV certificate deployed legitimate RMM tools to gain persistent access inside enterprise environments.
March 2

10 min read

OAuth redirection abuse enables phishing and malware delivery

OAuth redirection is being repurposed as a phishing delivery path.
February 26

8 min read

Threat modeling AI applications

AI threat modeling helps teams identify misuse, emergent risk, and failure modes in probabilistic and agentic AI systems.
February 24

14 min read

Developer-targeting campaign using malicious Next.js repositories

A developer-targeting campaign leveraged malicious Next.