Threat intelligence

The Microsoft Threat Intelligence community is made up of world-class experts, security researchers, analysts, and threat hunters who analyze 100 trillion signals daily to discover threats and deliver timely and relevant insight to protect customers. See our latest findings, insights, and guidance.

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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 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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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 24 19 min read

StealC and Amadey: Breaking down infostealers and the cybercrime services that deliver them

On June 24, 2026, Microsoft’s Digital Crimes Unit (DCU) facilitated the takedown, suspension, and blocking of domains that formed the backbone of the StealC and Amadey infrastructure.
June 17 15 min read

From package to postinstall payload: Inside the Mastra npm supply chain compromise by Sapphire Sleet

A poisoned npm package infected 140+ projects with a hidden payload.
June 8 17 min read

AI brands as bait: How threat actors are using the AI hype in social engineering

As threat actors operationalize AI to accelerate attacks, they are also leveraging the wider global interest around AI itself as a social engineering lure.
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May 28 24 min read

The Gentlemen ransomware: Dissecting a self-propagating Go encryptor

Microsoft Threat Intelligence presents a comprehensive analysis of The Gentlemen, a Go-based ransomware deployed by affiliates of Storm-2697 that combines per-file ephemeral key encryption with an aggressive self-propagation module to deploy itself across an entire network using series of simultaneous lateral movement techniques per target.
May 19 9 min read

Exposing Fox Tempest: A malware-signing service operation

Fox Tempest is a financially motivated threat actor operating a malware‑signing‑as‑a‑service (MSaaS) used by other cybercriminals, including Vanilla Tempest and Storm groups, to more effectively distribute malicious code, including ransomware.
May 14 18 min read

Kazuar: Anatomy of a nation-state botnet

Kazuar, a sophisticated malware family attributed to the Russian state actor Secret Blizzard, has been under constant development for years and continues to evolve in support of espionage-focused operations.
May 12 11 min read

Undermining the trust boundary: Investigating a stealthy intrusion through third-party compromise

Microsoft Incident Response investigated an attack operated through legitimate and trusted administrative mechanisms to blend seamlessly into routine operations and remain undetected demonstrating that intrusions have increasingly avoided using noisy exploits, obvious malware, or custom tooling, instead leveraging systems that organizations already trust within their environments.

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