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…


Windows Defender ATP machine learning: Detecting new and unusual breach activity

Microsoft has been investing heavily in next-generation security technologies. These technologies use our ability to consolidate large sets of data and build intelligent systems that learn from that data. These machine learning (ML) systems flag and surface threats that would otherwise remain unnoticed amidst the continuous hum of billions of normal events and the inability…

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Windows Defender ATP thwarts Operation WilySupply software supply chain cyberattack

Several weeks ago, the Windows Defender Advanced Threat Protection (Windows Defender ATP) research team noticed security alerts that demonstrated an intriguing attack pattern. These early alerts uncovered a well-planned, finely orchestrated cyberattack that targeted several high-profile technology and financial organizations. An unknown attacker was taking advantage of a silent yet effective attack vector: the compromised…

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

Cybercriminals are using a combination of improved script and well-maintained download sites to attempt installing Locky and Kovter on more computers. A few months ago, we reported an email campaign distributing .lnk files with a malicious script that delivered Locky ransomware. Opening the malicious .lnk files executed a PowerShell script that performed a download routine. More…

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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 on a…

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