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Microsoft Secure

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 malicious behavior. Macro-based threats have always been a prevalent entry point for malware, but we...

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Invisible resource thieves: The increasing threat of cryptocurrency miners

The surge in Bitcoin prices has driven widescale interest in cryptocurrencies. While the future of digital currencies is uncertain, they are shaking up the cybersecurity landscape as they continue to influence the intent and nature of attacks. Cybercriminals gave cryptocurrencies a bad name when ransomware started instructing victims to pay ransom in the form of...

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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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Windows Defender Exploit Guard: Reduce the attack surface against next-generation malware

Windows Defender Exploit Guard is a new set of intrusion prevention capabilities that ships with the Windows 10 Fall Creators Update. The four components of Windows Defender Exploit Guard are designed to lock down the device against a wide variety of attack vectors and block behaviors commonly used in malware attacks, while enabling enterprises to...

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Improved scripts in .lnk files now deliver Kovter in addition to Locky

Modern social engineering attacks use non-portable executable (PE) files like malicious scripts and macro-laced documents. Every month, Windows Defender AV detects non-PE threats on over 10 million machines. Learn how machine learning drives next-gen protection capabilities and cloud-based, real-time blocking of new and unknown threats: Machine learning vs. social engineering Cybercriminals are using a combination...

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Windows 10 to offer application developers new malware defenses

Application developers can now actively participate in malware defense – in a new way to help protect customers from dynamic script-based malware and non-traditional avenues of cyberattack. Microsoft is making that possible through the Antimalware Scan Interface (AMSI) – a generic interface standard that allows applications and services to integrate with any antimalware product present...

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