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.
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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. -
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. -
Enhancing AI security through global AI red teaming
Microsoft’s External Red Team Alliance (EXTRA) is a global AI security initiative designed to advance AI safety research and red teaming. Retain Microsoft Defender Experts
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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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. -
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. -
Least privilege for AI agents: Identity, access, and tool binding
As AI agents become more autonomous, strong identity, access, and auditing controls are critical to keeping them secure. -
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. 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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Turning threat intelligence into decisive action with Defender Experts
Security teams have never had more visibility, yet rarely have they felt more uncertain. -
Defending SaaS-based applications against ShinyHunters OAuth abuse
Microsoft Threat Intelligence identified threat actor activity with overlapping tradecraft commonly associated with ShinyHunters, including voice phishing (vishing), supply-chain compromise, and misconfigured guest access targeting SaaS-based applications. -
Protecting Microsoft at AI speed: How SFI proactively hardens our cloud
At Microsoft we encompass these security requirements, along with threat knowledge, and operational frameworks in our Secure Future Initiative (SFI), to guide what a well-defended cloud service looks like. -
Securing AI agents: When AI tools move from reading to acting
MCP tool poisoning turns trusted AI agents into a control plane for data loss.
