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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August 19 7 min read

Microsoft named a Leader in the Frost Radar™: Cloud Workload Protection Platforms, 2026

Microsoft is named a visionary leader in the 2026 Frost Radar for Cloud Workload Protection Platforms, recognized for unified runtime security with Microsoft Defender for Cloud.
August 18 16 min read

Hunting MacSync Stealer infrastructure through behavioral pivots

MacSync Stealer rapidly rotates domains to evade detection, but its behavior remains consistent.
August 10 3 min read

Microsoft named a Leader in the 2026 IDC MarketScape for MDR/MXDR for the Enterprise

Microsoft is named a Leader in the 2026 IDC MarketScape for MDR services.
August 10 20 min read

DeadLock ransomware: Breaking down a Rust-based encryptor with decentralized recovery infrastructure

Microsoft Threat Intelligence examines DeadLock ransomware, an emerging financially motivated operation distinguished by its use of decentralized infrastructure to support victim communications, negotiations, and data leak operations alongside double extortion tactics used to pressure victims.
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The Microsoft Defender family offers comprehensive threat prevention, detection, and response capabilities for everyone—from individuals looking to protect their family to the world’s largest enterprises.

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August 5 13 min read

From open lures to cloaked gates: How a macOS ClickFix campaign learned to hide

A macOS ClickFix campaign shifted tactics from openly serving infostealer lures to hiding them behind a browser-fingerprinting gate.
August 4 10 min read

ChainDrop supply chain compromise: Anatomy of a self-propagating worm

A credential-stealing worm hidden in more than 400 compromised npm packages automatically spread across software ecosystems by republishing malicious updates.
August 4 7 min read

128 Seconds to disruption: Microsoft Defender stops ransomware at QNET

Microsoft Defender automatically isolated a compromised QNET endpoint in 128 seconds, stopping a multi-stage attack before the payload could persist or spread.
July 31 20 min read

CaptiveCrunch: Midnight Blizzard targets travelers worldwide for malware delivery and credential theft

Storm-2945, a sub-cluster of the Russian threat actor Midnight Blizzard, has been observed compromising the sign-in portals of hospitality-related organizations such as hotels since May 2026 in order to deliver malware to travelers and steal credentials in an operation we call CaptiveCrunch.
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Microsoft Defender Experts are available to strengthen your teams with expertise when and where you need it. Learn how to elevate your security with expert-led services.

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July 30 5 min read

What’s new in Microsoft Security: July 2026

This month’s updates help security and IT teams secure their AI environments, use AI to defend, and strengthen the foundations that AI-powered operations depend on.
July 23 17 min read

Email threat landscape: Q2 2026 trends and insights

In the second quarter of 2026, the continuing effects of Microsoft’s disruption of the Tycoon2FA phishing platform contributed to sustained declines in several major phishing techniques, while threat actors expanded into Teams-based social engineering and employed increasingly automated and multi-stage attack chains.
July 16 12 min read

ACR Stealer: Two observed intrusion chains amid increased threat activity

From late April 2026 to mid-June 2026, Microsoft Defender Experts observed increased ACR Stealer activity across customer environments.
July 15 13 min read

Unpacking the AsyncAPI npm supply chain compromise and import-time payload delivery

Threat actors compromised AsyncAPI packages and weaponized trusted CI/CD workflows to distribute malware through npm.

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