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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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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.
July 27 5 min read

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.
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.
Go beyond data protection with Microsoft Purview

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July 16 6 min read

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.
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.
July 15 3 min read

Turning threat intelligence into decisive action with Defender Experts

Security teams have never had more visibility, yet rarely have they felt more uncertain.
July 13 9 min read

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.
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July 9 16 min read

GigaWiper: Anatomy of a destructive backdoor assembled from multiple malware

GigaWiper, also tracked as BLUERABBIT, is a destructive backdoor that combines multiple wiping and ransomware-like capabilities into a single operational platform.
June 30 6 min read

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.
June 29 9 min read

Chromium extension uses AI‑related branding to redirect browser search

A malicious Chromium-based extension that spoofs the AI-powered answer engine Perplexity AI redirects browser search traffic using MV3 APIs and intermediary infrastructure.
June 25 33 min read

Photo ZIP campaign targeting hospitality industry delivers Node.js implant for persistent access

Microsoft Threat Intelligence identified an active multi-stage intrusion campaign targeting hospitality organizations in Europe and Asia.