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Microsoft Secure

What’s new in Windows Defender ATP

We added new capabilities to each of the pillars of Windows Defender ATP’s unified endpoint protection platform: improved attack surface reduction, better-than-ever next-gen protection, more powerful post-breach detection and response, enhanced automation capabilities, more security insights, and expanded threat hunting. These enhancements boost Windows Defender ATP and accrue to the broader Microsoft Threat Protection, an...

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Multiple layers of machine learning models in Windows Defender ATP

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 months, machine learning has helped us to protect hundreds of thousands of customers against ransomware,...

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Now you see me: Exposing fileless malware

  (Note: For a comprehensive categorization of fileless malware and a complete list of Microsoft technologies that can protect against these elusive threats, read the latest blog post: Out of sight but not invisible: Defeating fileless malware with behavior monitoring, AMSI, and next-gen AV)   What exactly is fileless? Read latest blog post: Out of sight but...

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Microsoft Contact: Stephen Smith (stepsmit)
Agency: Cinco Design
Agency Contact: Kate Callahan (
Photographer: Amy Sacka (
Shoot month: March 2017
Location: Portland, OR
Business: LinkedIn Datacenter

Windows Defender ATP machine learning and AMSI: Unearthing script-based attacks that ‘live off the land’

Scripts are becoming the weapon of choice of sophisticated activity groups responsible for targeted attacks as well as malware authors who indiscriminately deploy commodity threats. Scripting engines such as JavaScript, VBScript, and PowerShell offer tremendous benefits to attackers. They run through legitimate processes and are perfect tools for “living off the land”—staying away from the...

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Detecting reflective DLL loading with Windows Defender ATP

Today’s attacks put emphasis on leaving little, if any, forensic evidence to maintain stealth and achieve persistence. Attackers use methods that allow exploits to stay resident within an exploited process or migrate to a long-lived process without ever creating or relying on a file on disk. In recent blogs we described how attackers use basic...

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Kovter becomes almost fileless, creates a new file type, and gets some new certificates

Trojan:Win32/Kovter is a well-known click-fraud malware which is challenging to detect and remove because of its file-less persistence on infected PCs. In this blog, we will share some technical details about the latest changes we have seen in Kovter’s persistence method and some updates on their latest malvertising campaigns. New persistence method Since June 2016,...

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