description: The following analytic detects the execution of PowerShell scripts containing Base64 encoded content, specifically identifying the use of `FromBase64String`. It leverages PowerShell ...

A digitally signed adware tool has deployed payloads running with SYSTEM privileges that disabled antivirus protections on thousands of endpoints, some in the educational, utilities, government, and ...

Windows 10 KB5071546 is now available, and I tested it on my PC, signed up for Extended Security Update (ESU). As expected, there’s nothing new in the December 2025 patch for Windows 10, but it’s ...

The threat actor known as Storm-0249 is likely shifting from its role as an initial access broker to adopt a combination of more advanced tactics like domain spoofing, DLL side-loading, and fileless ...

Cybersecurity researchers have warned of an actively expanding botnet dubbed Tsundere that's targeting Windows users. Active since mid-2025, the threat is designed to execute arbitrary JavaScript code ...

PowerShell is a powerful command shell that pipes objects - not just text. Because of this ability, you can string practically unrelated commands together in many different ways to work on different ...

Microsoft security researchers analyze suspicious files to determine if they are threats, unwanted applications, or normal files. Submit files you think are malware or files that you believe have been ...

To install Java on Windows and run Java apps on Microsoft’s operating system, you need to obtain a copy of the Java Development Toolkit (JDK) installation media. The JDK includes both a Java Runtime ...

A new malware distribution campaign uses fake Google Chrome, Word, and OneDrive errors to trick users into running malicious PowerShell "fixes" that install malware. The new campaign was observed ...