Discover how automatic attack disruption protects critical assets while ensuring business continuity

Traditional security solutions often operate in a one-size-fits-all alert model that treats every detection equally, regardless of how important the asset is. But not all assets are equal. Critical assets are systems governing access, identity, or sensitive data. They are essential to an...

Announcing a new strategic collaboration to bring clarity to threat actor naming

In today’s cyberthreat landscape, even seconds of delay can mean the difference between stopping a cyberattack or falling victim to ransomware. One major cause of delayed response is understanding threat actor attribution, which is often slowed by inaccurate or incomplete data as well as...

Defending against evolving identity attack techniques

In today’s evolving cyber threat landscape, threat actors are committed to advancing the sophistication of their attacks. The increasing adoption of essential security features like multifactor authentication MFA, passwordless solutions, and robust email protections has changed many aspects of th...

How to deploy AI safely

In this blog you will hear directly from Corporate Vice President and Deputy Chief Information Security Officer CISO for AI, Yonatan Zunger, about how to build a plan to deploy AI safely. This blog is part of a new ongoing series where our Deputy CISOs share their thoughts on what is most importa...

The future of AI agents—and why OAuth must evolve

I believe we're at the beginning of something extraordinary. Today's AI agents are already impressive—they're helping software engineers write code, assisting site reliability teams in troubleshooting systems, and handling a variety of analytical tasks. Yet, as capable as these specialized agents...

New Russia-affiliated actor Void Blizzard targets critical sectors for espionage

Executive summary: Void Blizzard is a new threat actor Microsoft Threat Intelligence has observed conducting espionage operations primarily targeting organizations that are important to Russian government objectives. These include organizations in government, defense, transportation, media, NGOs,...

Lumma Stealer: Breaking down the delivery techniques and capabilities of a prolific infostealer

Over the past year, Microsoft observed the persistent growth and operational sophistication of Lumma Stealer, an infostealer malware used by multiple financially motivated threat actors to target various industries. Our investigation into Lumma Stealer’s distribution infrastructure reveals a...

Microsoft extends Zero Trust to secure the agentic workforce

Microsoft’s 2025 Work Trend Index Read more ↗ Agentic AI transformation is giving rise to the Frontier Firm—a new type of organization characterized by on-demand intelligence and a workforce where humans and agents work in tandem. According to Microsoft’s 2025 Work Trend Index, we expect every...

​​How the Microsoft Secure Future Initiative brings Zero Trust to life

In this blog, you'll learn more about how the Microsoft Secure Future Initiative SFI—a real-world case study on Zero Trust—aligns with Zero Trust strategies. We’ll share key updates from the April 2025 SFI progress report and practical Zero Trust guidance to help you strengthen your organization’...

Marbled Dust leverages zero-day in Output Messenger for regional espionage

Since April 2024, the threat actor that Microsoft Threat Intelligence tracks as Marbled Dust has been observed exploiting user accounts that have not applied fixes to a zero-day vulnerability CVE-2025-27920 in the messaging app Output Messenger, a multiplatform chat software. These exploits have...

Marbled Dust leverages zero-day in Output Messenger for regional espionage

Since April 2024, the threat actor that Microsoft Threat Intelligence tracks as Marbled Dust has been observed exploiting user accounts that have not applied fixes to a zero-day vulnerability CVE-2025-27920 in the messaging app Output Messenger, a multiplatform chat software. These exploits have...

Meet the Deputy CISOs who help shape Microsoft’s approach to cybersecurity: Part 2

Microsoft launched its Cybersecurity Governance Council in 2024, and with it, named a group of deputy chief information security officers that ensure comprehensive oversight of the company’s cybersecurity risk, defense, and compliance. These leaders work in tandem with product and engineering...

Meet the Deputy CISOs who help shape Microsoft’s approach to cybersecurity: Part 2

Microsoft launched its Cybersecurity Governance Council in 2024, and with it, named a group of deputy chief information security officers that ensure comprehensive oversight of the company’s cybersecurity risk, defense, and compliance. These leaders work in tandem with product and engineering...

Microsoft partners with Global Anti-Scam Alliance to fight cybercrime

Being the victim of a scam can be devastating. Unfortunately, the number of people who can attest to the truth of this statement, either because they themselves have been scammed or because it has happened to someone they know, is growing. The Global Anti-Scam Alliance GASA reports that in 2024...

Microsoft partners with Global Anti-Scam Alliance to fight cybercrime

Being the victim of a scam can be devastating. Unfortunately, the number of people who can attest to the truth of this statement, either because they themselves have been scammed or because it has happened to someone they know, is growing. The Global Anti-Scam Alliance GASA reports that in 2024...

Analyzing CVE-2025-31191: A macOS security-scoped bookmarks-based sandbox escape

In April 2024, Microsoft uncovered a vulnerability in macOS that could allow specially crafted codes to escape the App Sandbox and run unrestricted on the system. An attacker could create an exploit to escape the App Sandbox without user interaction required for any sandboxed app using...

Analyzing CVE-2025-31191: A macOS security-scoped bookmarks-based sandbox escape

In April 2024, Microsoft uncovered a vulnerability in macOS that could allow specially crafted codes to escape the App Sandbox and run unrestricted on the system. An attacker could create an exploit to escape the App Sandbox without user interaction required for any sandboxed app using...

Pushing passkeys forward: Microsoft’s latest updates for simpler, safer sign-ins

Happy World Passkey Day! As the world shifts from passwords to passkeys, we’re excited to join the FIDO Alliance in leaving “World Password Day” behind to celebrate the very first “World Passkey Day.” To commemorate this renaming, Microsoft and dozens of other organizations have taken the Passkey...

Pushing passkeys forward: Microsoft’s latest updates for simpler, safer sign-ins

Happy World Passkey Day! As the world shifts from passwords to passkeys, we’re excited to join the FIDO Alliance in leaving “World Password Day” behind to celebrate the very first “World Passkey Day.” To commemorate this renaming, Microsoft and dozens of other organizations have taken the Passkey...

14 secure coding tips: Learn from the experts at Microsoft Build

Hey friends! If you are a developer, you know that writing clean and efficient code is just the starting point. Now, with AI playing a bigger role, secure coding isn't just a 'nice-to-have'—it's a must. Whether you're building web apps, working on cloud services, or adding AI to your projects,...

14 secure coding tips: Learn from the experts at Microsoft Build

Hey friends! If you are a developer, you know that writing clean and efficient code is just the starting point. Now, with AI playing a bigger role, secure coding isn't just a 'nice-to-have'—it's a must. Whether you're building web apps, working on cloud services, or adding AI to your projects,...

Microsoft announces the 2025 Security Excellence Awards winners

In today’s rapidly evolving digital world, security requires a global community of defenders working together as a team to build a safer world for all. That’s why we’re thrilled to recognize the extraordinary individuals and organizations who have gone above and beyond in the fight against...

Microsoft announces the 2025 Security Excellence Awards winners

In today’s rapidly evolving digital world, security requires a global community of defenders working together as a team to build a safer world for all. That’s why we’re thrilled to recognize the extraordinary individuals and organizations who have gone above and beyond in the fight against...

Faster, more personalized service begins at the frontline with Microsoft Intune

In healthcare, patient trust often begins at the frontline with people who deliver care, respond to questions, and manage crucial in-the-moment decisions. Increasingly, those experiences are shaped by the tools frontline workers use. When devices are secure, responsive, and tailored to clinical...

Faster, more personalized service begins at the frontline with Microsoft Intune

In healthcare, patient trust often begins at the frontline with people who deliver care, respond to questions, and manage crucial in-the-moment decisions. Increasingly, those experiences are shaped by the tools frontline workers use. When devices are secure, responsive, and tailored to clinical...

​​Explore practical best practices to secure your data with Microsoft Purview​​

According to the Microsoft 2024 Data Security Index, organizations experience an average of 156 data security incidents annually, and this cyberthreat continues to be a top concern for data security decision-makers.1 A full 82% of security decision-makers believe a comprehensive, fully integrated...

​​Explore practical best practices to secure your data with Microsoft Purview​​

According to the Microsoft 2024 Data Security Index, organizations experience an average of 156 data security incidents annually, and this cyberthreat continues to be a top concern for data security decision-makers.1 A full 82% of security decision-makers believe a comprehensive, fully integrated...

New whitepaper outlines the taxonomy of failure modes in AI agents

We are releasing a taxonomy of failure modes in AI agents to help security professionals and machine learning engineers think through how AI systems can fail and design them with safety and security in mind. The taxonomy continues Microsoft AI Red Team's work to lead the creation of systematizati...

New whitepaper outlines the taxonomy of failure modes in AI agents

We are releasing a taxonomy of failure modes in AI agents to help security professionals and machine learning engineers think through how AI systems can fail and design them with safety and security in mind. The taxonomy continues Microsoft AI Red Team's work to lead the creation of systematizati...

Understanding the threat landscape for Kubernetes and containerized assets

The dynamic nature of containers can make it challenging for security teams to detect runtime anomalies or pinpoint the source of a security incident, presenting an opportunity for attackers to stay undetected. Microsoft Threat Intelligence has observed threat actors taking advantage of unsecured...

Securing our future: April 2025 progress report on Microsoft’s Secure Future Initiative

The Microsoft Secure Future Initiative SFI stands as the largest cybersecurity engineering project in history and most extensive effort of its kind at Microsoft. Since inception, we've dedicated the equivalent of 34,000 engineers working full-time for 11 months to mitigate risks and address the...

Microsoft’s Secure by Design journey: One year of success

Cybersecurity is one of the top risks facing businesses. Organizations are struggling to navigate the ever-evolving cyberthreat landscape in which 600 million identity attacks are carried out daily.1 The median time for a cyberattacker to access private data from phishing is 1 hour and 12 minutes...

Cyber Signals Issue 9 | AI-powered deception: Emerging fraud threats and countermeasures

Introduction | Security snapshot | Threat briefing Defending against attacks | Expert profile Microsoft maintains a continuous effort to protect its platforms and customers from fraud and abuse. From blocking imposters on Microsoft Azure and adding anti-scam features to Microsoft Edge, to fightin...

Threat actors misuse Node.js to deliver malware and other malicious payloads

Since October 2024, Microsoft Defender Experts DEX has observed and helped multiple customers address campaigns leveraging Node.js to deliver malware and other payloads that ultimately lead to information theft and data exfiltration. While traditional scripting languages like Python, PHP, and...

​​Transforming security​ with Microsoft Security Exposure Management initiatives​

Just as nature sheds its winter coat, it's time to prune outdated security measures and plant the seeds of a more robust defense. For years, Microsoft Secure Score has served as a foundational tool for organizations to assess their security posture. By providing a numerical representation of...

Explore how to secure AI by attending our Learn Live Series

As organizations develop, use, and increasingly rely on AI applications, they must address new and amplified security risks. Are you prepared to secure your environment for AI adoption? How about identifying threats to your AI and safeguarding data? Register to attend one or all our Learn Live...

The ultimate guide to Microsoft Security at RSAC 2025

The Ultimate Guide to Microsoft Security at RSAC 2025 So you just finished watching Microsoft Secure. That means by now, you’ve heard about our new protections for AI and Microsoft Security Copilot agents. These innovations will be the focus of Microsoft Security’s sessions and activities at RSAC...

Stopping attacks against on-premises Exchange Server and SharePoint Server with AMSI

Exchange Server and SharePoint Server are business-critical assets and considered crown jewels for many organizations, making them attractive targets for attacks. To help customers protect their environments and respond to these attacks, Exchange Server and SharePoint Server now integrate with th...

How cyberattackers exploit domain controllers using ransomware

In recent years, human-operated cyberattacks have undergone a dramatic transformation. These attacks, once characterized by sporadic and opportunistic attacks, have evolved into highly sophisticated, targeted campaigns aimed at causing maximum damage to organizations, with the average cost of a...

Exploitation of CLFS zero-day leads to ransomware activity

Microsoft Threat Intelligence Center MSTIC and Microsoft Security Response Center MSRC have discovered post-compromise exploitation of a zero-day elevation of privilege vulnerability in the Windows Common Log File System CLFS against a small number of targets. The targets include organizations in...

Meet the Deputy CISOs who help shape Microsoft’s approach to cybersecurity

Microsoft launched its Cybersecurity Governance Council in 2024, and with it, named a group of deputy chief information security officers that ensure comprehensive oversight of the company's cybersecurity risk, defense, and compliance. These leaders work in tandem with product and engineering...

Tech Accelerator: Azure security and AI adoption

Are you looking for guidance on how to effectively integrate security best practices within your Azure and AI projects? We know the pace of technological innovation offers as many opportunities as it does challenges. However, security cannot be an afterthought as you create Azure deployments and...

Threat actors leverage tax season to deploy tax-themed phishing campaigns

As Tax Day approaches in the United States on April 15, Microsoft has observed several phishing campaigns using tax-related themes for social engineering to steal credentials and deploy malware. These campaigns notably use redirection methods such as URL shorteners and QR codes contained in...

Transforming public sector security operations in the AI era

The cyberthreat landscape is evolving at an unprecedented pace, becoming increasingly dangerous and complex. Nation-state threat actors and cybercriminals are employing advanced tactics and generative AI to execute highly sophisticated attacks. This situation is further compounded by outdated...

Analyzing open-source bootloaders: Finding vulnerabilities faster with AI

By leveraging Microsoft Security Copilot to expedite the vulnerability discovery process, Microsoft Threat Intelligence uncovered several vulnerabilities in multiple open-source bootloaders, impacting all operating systems relying on Unified Extensible Firmware Interface UEFI Secure Boot as well ...

New innovations in Microsoft Purview for protected, AI-ready data

The Microsoft Fabric and Microsoft Purview teams are excited to be in Las Vegas from March 31 to April 2, 2025, for the second annual and highly anticipated Microsoft Fabric Community Conference. With more than 200 sessions, 13 focused tracks, 21 hands-on workshops, and two keynotes, attendees ca...

US Department of Labor’s journey to Zero Trust security with Microsoft Entra ID

For several years, Microsoft has been helping United States federal and state government groups, including military departments and civilian agencies, transition to a Zero Trust security model. Advanced features in Microsoft Entra ID have helped these organizations meet requirements to employ...

Microsoft unveils Microsoft Security Copilot agents and new protections for AI

In this age of AI, securing AI and using it to boost security are crucial for every organization. At Microsoft, we are dedicated to helping organizations secure their future with our AI-first, end-to-end security platform. One year ago, we launched Microsoft Security Copilot to empower defenders ...

AI innovation requires AI security: Hear what’s new at Microsoft Secure

When you’re secure—innovation happens. But, the fast pace of AI often outpaces traditional security measures, leaving gaps that bad actors can take advantage of. As a security professional, you’re the hero in this battle between protecting vast amounts of data while ensuring AI systems remain...

StilachiRAT analysis: From system reconnaissance to cryptocurrency theft

In November 2024, Microsoft Incident Response researchers uncovered a novel remote access trojan RAT we named StilachiRAT that demonstrates sophisticated techniques to evade detection, persist in the target environment, and exfiltrate sensitive data. Analysis of the StilachiRAT’s...