Microsoft Defender for Endpoint

Refine Results

Filtered by

Clear All

Microsoft Defender for Endpoint

Refine results

Sort By

Content Type

Topic

Products and services

Publish date

Start Date

End Date

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.
May 4

8 min read

Breaking the code: Multi-stage ‘code of conduct’ phishing campaign leads to AiTM token compromise

Microsoft Defender Research observed a large-scale credential theft campaign that exemplifies this trend, using code of conduct-themed lures, a multi-step attack chain, and legitimate email services to distribute fully authenticated messages from attacker-controlled domains.
May 1

11 min read

Microsoft Agent 365, now generally available, expands capabilities and integrations

Today we’re announcing the general availability of Agent 365, plus previews of new capabilities to discover and manage shadow AI agents, including local agents like OpenClaw and Claude Code.
April 30

15 min read

Email threat landscape: Q1 2026 trends and insights

In early 2026, email threats increased with a rise in credential phishing, QR code phishing, and CAPTCHA-gated campaigns, highlighted by Microsoft’s disruption of the Tycoon2FA phishing platform which led to a 15% volume decrease and shifts in threat actor tactics.
Prevent threats with Microsoft Defender

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.

Explore products
April 16

25 min read

Dissecting Sapphire Sleet’s macOS intrusion from lure to compromise

The Microsoft Defender Security Research Team uncovered a sophisticated macOS intrusion campaign attributed to the North Korean threat actor Sapphire Sleet that abuses user driven execution and social engineering to bypass macOS security protections and steal credentials, cryptocurrency assets, and sensitive data.
April 7

9 min read

SOHO router compromise leads to DNS hijacking and adversary-in-the-middle attacks

Executive summary Forest Blizzard, a threat actor linked to the Russian military, has been compromising insecure home and small-office internet equipment like routers, then modifying their settings in ways that turn them into part of the actor’s malicious infrastructure.
April 6

12 min read

Storm-1175 focuses gaze on vulnerable web-facing assets in high-tempo Medusa ransomware operations

The financially motivated cybercriminal threat actor Storm-1175 operates high-velocity ransomware campaigns that weaponize recently disclosed vulnerabilities to obtain initial access, exfiltrate data, and deploy Medusa ransomware.
April 1

16 min read

Mitigating the Axios npm supply chain compromise

On March 31, 2026, the popular HTTP client Axios experienced a supply chain attack, causing two newly published npm packages for version updates to download from command and control (C2) that Microsoft Threat Intelligence has attributed to the North Korean state actor Sapphire Sleet.
Retain Microsoft Security Experts

Microsoft Security Experts are now available to strengthen your team with managed security services. Learn how to defend against threats with security experts.

Get started
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 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 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.

Microsoft Defender for Endpoint

Filtered by

Refine results

Prevent threats with Microsoft Defender

Retain Microsoft Security Experts

Get started with Microsoft Security