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Screenshot of obfuscated script

Out of sight but not invisible: Defeating fileless malware with behavior monitoring, AMSI, and next-gen AV

Consider this scenario: Two never-before-seen, heavily obfuscated scripts manage to slip past file-based detection and dynamically load an info-stealing payload into memory. The scripts are part of a social engineering campaign that tricks potential victims into running the scripts, which ... continue reading
Office VBA + AMSI: Parting the veil on malicious macros

Office VBA + AMSI: Parting the veil on malicious macros

As part of our continued efforts to tackle entire classes of threats, Office 365 client applications now integrate with Antimalware Scan Interface (AMSI), enabling antivirus and other security solutions to scan macros and other scripts at runtime to check for ... continue reading
Image of four hands collaborating over a drawing of a lightbulb.

Protect your data in files, apps, and devices

This blog is part of a series that responds to common questions we receive from customers about deployment of Microsoft 365 security solutions. In this series youll find context, answers, and guidance for deployment and driving adoption within your organization ... continue reading
Taking apart a double zero-day sample discovered in joint hunt with ESET

Taking apart a double zero-day sample discovered in joint hunt with ESET

In late March 2018, I analyzed an interesting PDF sample found by ESET senior malware researcher Anton Cherpanov. The sample was initially reported to Microsoft as a potential exploit for an unknown Windows kernel vulnerability. During my investigation in parallel ... continue reading
New FastTrack benefit: Deployment support for Co-management on Windows 10 devices

New FastTrack benefit: Deployment support for Co-management on Windows 10 devices

This blog is part of a series that responds to common questions we receive from customers about deployment of Microsoft 365 security solutions. In this series youll find context, answers, and guidance for deployment and driving adoption within your organization ... continue reading
Building Zero Trust networks with Microsoft 365

Building Zero Trust networks with Microsoft 365

The traditional perimeter-based network defense is obsolete. Perimeter-based networks operate on the assumption that all systems within a network can be trusted. However, todays increasingly mobile workforce, the migration towards public cloud services, and the adoption of Bring Your Own ... continue reading
Machine learning vs. social engineering

Machine learning vs. social engineering

Machine learning is a key driver in the constant evolution of security technologies at Microsoft. Machine learning allows Microsoft 365 to scale next-gen protection capabilities and enhance cloud-based, real-time blocking of new and unknown threats. Just in the last few ... continue reading
Adding transparency and context into industry AV test results

Adding transparency and context into industry AV test results

Corporate Vice President Brad Anderson recently shared his insights on how Windows Defender Advanced Threat Protection (Windows Defender ATP) evolved to achieve important quality milestones. Our Windows Defender ATP team is committed to delivering industry-leading protection, customer choice, and transparency ... continue reading
Why Windows Defender Antivirus is the most deployed in the enterprise

Why Windows Defender Antivirus is the most deployed in the enterprise

Statistics about the success and sophistication of malware can be daunting. The following figure is no different: Approximately 96% of all malware is polymorphic meaning that it is only experienced by a single user and device before it is replaced ... continue reading
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