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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

Now you see me: Exposing fileless malware

Attackers are determined to circumvent security defenses using increasingly sophisticated techniques. Fileless malware boosts the stealth and effectiveness of an attack, and two of last years major ransomware outbreaks (Petya and WannaCry) used fileless techniques as part of their kill ... continue reading
Data center

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 ... continue reading
Detecting reflective DLL loading with Windows Defender ATP

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 ... continue reading