Defending SaaS-based applications against ShinyHunters OAuth abuse

In this article 1. Attack chain overview 2. Improving visibility into Salesforce OAuth abuse 3. Mitigation and protection guidance 4. Learn more In a series of campaigns observed between mid-2025 and mid-2026, Microsoft identified threat actor activity with overlapping tradecraft commonly...

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...

Microsoft announces the 2024 Microsoft Security Excellence Awards winners

At this years Microsoft Security Excellence Awards, we took a journey through the evolution of cybersecurity from the 1950s to today. While this event theme celebrated the significant technological advancements that have shaped each decade, the main focus was on the Microsoft Intelligent Security...

Gain flexibility and scale with a cloud-native DLP solution

We’re living in a seismic era for data security. Chief information security officers CISOs have to contend with a digital landscape that seems to shift daily as more organizations move to remote and hybrid work, redrawing the boundaries for how data is used and shared. The cloud has enabled...

The Microsoft Intune Suite fuels cyber safety and IT efficiency

Today marks a significant shift in endpoint management and security. Were launching the Microsoft Intune Suite, which unifies mission-critical advanced endpoint management and security solutions into one simple bundle. The new Intune Suite can simplify our customers’ endpoint management experienc...

New insights on cybersecurity in the age of hybrid work

As we approach the last week of Cybersecurity Awareness Month, I think about what is top of mind for myself and my peers in security. The past year has continued the 2020s major shift in the way organizations operate. Recent data shows that 81 percent of enterprise organizations have begun the mo...

How cyberattacks are changing according to new Microsoft Digital Defense Report

In 2021, cybercrime has become more sophisticated, widespread, and relentless. Criminals have targeted critical infrastructure—healthcare,1 information technology,2 financial services,3 energy sectors4—with headline-grabbing attacks that crippled businesses and harmed consumers. But there are...

Widespread credential phishing campaign abuses open redirector links

Microsoft has been actively tracking a widespread credential phishing campaign using open redirector links. Attackers combine these links with social engineering baits that impersonate well-known productivity tools and services to lure users into clicking. Doing so leads to a series of...

7 ways to harden your environment against compromise

Here at the global Microsoft Compromise Recovery Security Practice CRSP, we work with customers who have experienced disruptive security incidents to restore trust in identity systems and remove adversary control. During 2020, the team responded to many incidents involving ransomware and the...

The critical role of Zero Trust in securing our world

We are operating in the most complex cybersecurity landscape that we’ve ever seen. While our current ability to detect and respond to attacks has matured incredibly quickly in recent years, bad actors haven’t been standing still. Large-scale attacks like those pursued by Nobelium1 and Hafnium,...

CRSP: The emergency team fighting cyber attacks beside customers

What is CRSP? Microsoft Global Compromise Recovery Security Practice. Who is CRSP? We are a worldwide team of cybersecurity experts operating in most countries, across all organizations public and private, with deep expertise to secure an environment post-security breach and to help you prevent a...

Center for Threat-Informed Defense teams up with Microsoft, partners to build the ATT&CK® for Containers matrix

The MITRE ATT&CK® for Containers matrix was published today, establishing an industry knowledge base of attack techniques associated with containerization and related technologies that are increasingly more ubiquitous in the current computing landscape. Microsoft is happy to have contributed and...

Protect your business from email phishing with multi-factor authentication

Cybersecurity has been in the news far more often in the past 12 months than in previous years, as cybercriminals escalated their activity during the COVID-19 pandemic quarantine. The seismic shift of hundreds of millions of people connecting and working from home every day presented cybercrimina...

Meet the Microsoft Pluton processor – The security chip designed for the future of Windows PCs

The role of the Windows PC and trust in technology are more important than ever as our devices keep us connected and productive across work and life. Windows 10 is the most secure version of Windows ever, built with end-to-end security for protection from the edge to the cloud all the way down to...

Managing cybersecurity like a business risk: Part 1—Modeling opportunities and threats

In recent years, cybersecurity has been elevated to a C-suite and board-level concern. This is appropriate given the stakes. Data breaches can have significant impact on a company’s reputation and profits. But, although businesses now consider cyberattacks a business risk, management of cyber ris...

Empowering your remote workforce with end-user security awareness

COVID-19 has rapidly transformed how we all work. Organizations need quick and effective user security and awareness training to address the swiftly changing needs of the new normal for many of us. To help our customers deploy user training quickly, easily and effectively, we are announcing the...

Mobile security—the 60 percent problem

This blog post is part of the Microsoft Intelligence Security Association MISA guest blog series. To learn more about MISA, visit the MISA webpage. Off the top of your head, what percentage of endpoints in your organization are currently protected? Something in the 98 percent+ range? Most...

Visionary security partners to be honored at the very first Microsoft Security 20/20 event

Microsoft Security 20/20 is nearly here and our team is putting the final touches on what we think will be a memorable event. Microsoft Security 20/20 will put the spotlight on companies and individuals with a clear-eyed view of the security challenges we face and smart solutions to help solve...

Afternoon Cyber Tea—The State of Cybersecurity: How did we get here? What does it mean?

Every year the number and scale of cyberattacks grows. Marc Goodman, a global security strategist, futurist, and author of the book, Future Crimes: Everything is Connected, Everyone is Vulnerable, and What We Can Do About It, thinks a lot about how we got here and what it means, which is why he w...

Overwhelmed by overchoice at RSA Conference 2018

As over 500 companies vied for mindshare at this years RSA conference - a cacophony of vendors pitching thousands of products from brightly colored booths - it reminded me of how challenging it was for me to separate signal from noise when I was managing global networks. And the rapid growth of...

Sharing research and discoveries at PWN2OWN

The annual PWN2OWN exploit contest at the CanSecWest conference in Vancouver, British Columbia, Canada, brings together some of the top security talent from across the globe in a friendly competition. For the participants, these events are a platform to demonstrate world-class skills and vie for...

ASCII smuggling crosses over from AI prompt injection to phishing evasion

In this article 1. What is ASCII smuggling? 2. Writing a practical ASCII-smuggling signature 3. What we observed: ASCII smuggling repurposed for phishing 4. What is known and what is new 5. Is there a detection gap? 6. Mitigation and protection guidance 7. References 8. Learn More Microsoft...

From poisoned search results to GPU mining: A cryptojacking campaign abusing ScreenConnect and Microsoft .NET utilities

In this article 1. Attack chain overview 2. Mitigation and protection guidance 3. References 4. Learn more Microsoft Defender Experts identified an active cryptojacking campaign in which malicious download sites are surfaced not only through traditional search engine poisoning, but also through A...

​​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’...

Microsoft announces the 2023 Microsoft Security Excellence Awards winners

In a world that’s constantly changing and challenging us, we believe that nothing can stop us when we work together. That’s the spirit of collaboration we celebrated on April 24, 2023, at the fourth annual Microsoft Security Excellence Awards. These awards recognize outstanding contributions from...

Malicious OAuth applications abuse cloud email services to spread spam

Microsoft researchers recently investigated an attack where malicious OAuth applications were deployed on compromised cloud tenants and then used to control Exchange Online settings and spread spam. The investigation revealed that the threat actor launched credential stuffing attacks against...

Detecting malicious key extractions by compromised identities for Azure Cosmos DB

Azure Cosmos DB is a fully managed NoSQL cloud database service for modern app development. It offers a variety of advanced built-in features, such as automatic worldwide data replication, lightning-fast response types, and a variety of APIs. In this blog post, we describe security practices for...

Destructive malware targeting Ukrainian organizations

Microsoft Threat Intelligence Center MSTIC has identified evidence of a destructive malware operation targeting multiple organizations in Ukraine. This malware first appeared on victim systems in Ukraine on January 13, 2022. Microsoft is aware of the ongoing geopolitical events in Ukraine and...

Catching the big fish: Analyzing a large-scale phishing-as-a-service operation

In researching phishing attacks, we came across a campaign that used a rather high volume of newly created and unique subdomains—over 300,000 in a single run. This investigation led us down a rabbit hole as we unearthed one of the operations that enabled the campaign: a large-scale...

Microsoft and NIST collaborate on EO to drive Zero Trust adoption

2020s Nobelium attack sent shock waves through both government and private sectors. 2021 has already seen large-scale nation-state attacks such as Hafnium1 alongside major ransomware attacks2 on critical infrastructure. The breadth and boldness of these attacks show that, far from being deterred,...

Microsoft delivers comprehensive solution to battle rise in consent phishing emails

Microsoft threat analysts are tracking a continued increase in consent phishing emails, also called illicit consent grants, that abuse OAuth request links in an attempt to trick recipients into granting attacker-owned apps permissions to access sensitive data. This blog offers a look into the...

Microsoft to acquire RiskIQ to strengthen cybersecurity of digital transformation and hybrid work

Organizations are increasingly using the cloud to reimagine every facet of their business. Hybrid work has accelerated this digital transformation, and customers are challenged with the increasing sophistication and frequency of cyberattacks. Today, Microsoft is announcing that we have entered in...

How to apply a Zero Trust approach to your IoT solutions

For many, 2020 was a year of survival as they rapidly transformed their businesses in response to a new normal. From enabling new remote and hybrid work models to implementing new technology to help optimize operations, the last year has seen a significant uptick in the proliferation and role of...

Automating threat actor tracking: Understanding attacker behavior for intelligence and contextual alerting

As seen in recent sophisticated cyberattacks, especially human-operated campaigns, it’s critical to not only detect an attack as early as possible but also to rapidly determine the scope of the compromise and predict how it will progress. How an attack proceeds depends on the attacker’s goals and...

How IT leaders are securing identities with Zero Trust

The past twelve months have been a remarkable time of digital transformation as organizations, and especially digital security teams, adapt to working remotely and shifting business operations. IT leaders everywhere turned to Zero Trust approaches to alleviate the challenges of enabling and...

Modernize secure access for your on-premises resources with Zero Trust

Change came quickly in 2020. More likely than not, a big chunk of your workforce has been forced into remote access. And with remote work came an explosion of bring-your-own-device BYOD scenarios, requiring your organization to extend the bounds of your network to include the entire internet and...

Microsoft Security: How to cultivate a diverse cybersecurity team

Boost creative problem solving with a diverse cybersecurity team In cybersecurity, whether we are talking about cryptocurrency mining, supply chain attacks, attacks against IoT, or COVID-19-related phishing lures, we know that gaining the advantage over our adversaries requires greater diversity ...

Microsoft Build brings new innovations and capabilities to keep developers and customers secure

As both organizations and developers adapt to the new reality of working and collaborating in a remote environment, it’s more important than ever to ensure that their experiences are secure and trusted. As part of this week’s Build virtual event, we’re introducing new Identity innovation to help...

Understand and improve your security posture with Microsoft 365

I kickstarted 2019 with a “dry,” keto January. And, as so often happens, I found a parallel between my personal life and my chosen industry, cybersecurity. In this case, it was measurement. How do you know if you’re healthy? There are clear indicators when you’re not healthy, such as a sore throa...

How to mitigate rapid cyberattacks such as Petya and WannaCrypt

In the first blog post of this 3-part series, we introduced what rapid cyberattacks are and illustrated how rapid cyberattacks are different in terms of execution and outcome. In the second blog post, we provided some details on Petya and how it worked. In this final blog post, we will share:...

Active attack: Dirty Frag Linux vulnerability expands post-compromise risk

In this article 1. Why Dirty Frag matters 2. Technical overview 3. Exploitation scenarios 4. Mitigation guidance 5. Post-mitigation integrity verification 6. References A newly disclosed Linux local privilege escalation vulnerability known as “Dirty Frag” enables escalation from an unprivileged...

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

In this article 1. Storm-1175’s rapid attack chain: From initial access to impact 2. Mitigation and protection guidance 3. Microsoft Defender detections 4. Indicators of compromise The financially motivated cybercriminal actor tracked by Microsoft Threat Intelligence as Storm-1175 operates...

Practical tips on how to use application security testing and testing standards

The security community is continuously changing, growing, and learning from each other to better position the world against cyber threats. In the latest Voice of the Community blog series post, Microsoft Product Marketing Manager Natalia Godyla talks with Daniel Cuthbert, Global Head of Security...

Afternoon Cyber Tea: Microsoft’s cybersecurity response to COVID-19

On February 25, 2020, Microsoft Chief Information Security Officer CISO Bret Arsenault was attending the RSA Conference in San Francisco when the city declared a state of emergency because of COVID-19. Shortly after flying back to Seattle, Bret learned of the first death from the coronavirus in...

Protecting SAP applications with the new Azure Sentinel SAP threat monitoring solution

As one of the leading solution providers for applications that manage business processes, SAP is the custodian for massive amounts of sensitive data in many of the biggest organizations in the world. Since these applications are business-critical, an SAP security breach can be catastrophic. Yet,...

How far have we come? The evolution of securing identities

The security community is continuously changing, growing, and learning from each other to better position the world against cyber threats. In the latest Voice of the Community blog series post, Microsoft Product Marketing Manager Natalia Godyla talks with Troy Hunt, founder of Have I Been Pwned,...

Medius’ small IT team supports distributed workforce with Azure Active Directory

In today’s Voice of the Customer blog post, IT Manager Jacob Andersson and IT Systems Architect Fredrik Frööjd of Medius share how Azure Active Directory Azure AD has inspired employees to live by the cloud commitment the company encourages from customers and helped their small team support a...

Microsoft surpasses $10 billion in security business revenue, more than 40 percent year-over-year growth

I joined Microsoft a little more than six months ago—amid a global pandemic and a new norm of remote work, as well as one of the most rapidly evolving threat landscapes in history. We’ve witnessed more sophisticated attacks, like the recent SolarWinds incident, as well as an increase in attack...

Privacy breaches: Using Microsoft 365 Advanced Audit and Advanced eDiscovery to minimize impact

GDPR, HIPAA, GLBA, all 50 U.S. States, and many countries have privacy breach reporting requirements. If an organization experiences a breach of customer or employee personal information, they must report it within the required time frame. The size and scope of this reporting effort can be massiv...

IoT security: how Microsoft protects Azure Datacenters

Azure Sphere first entered the IoT Security market in 2018 with a clear mission—to empower every organization on the planet to connect and create secure and trustworthy IoT devices. Security is the foundation for durable innovation and business resilience. Every industry investing in IoT must...