In this blog post we discuss how to debug Windows' Isolated User Mode (IUM) processes, also known as Trustlets, using the virtual TPM of Microsoft Hyper-V as our target.

A step by step approach to reverse engineer Hyper-V and have a low level insight into Virtual Trust Levels.

This article describes how Windows Defender implements its network inspection feature inside the kernel through the use of WFP (Windows Filtering Platform), how the device object’s security descriptor protects it from being exposed to potential vulnerabilities and details some bugs I found. As a complement to this post, a small utility is released to test the different bugs.

Microsoft is currently working on Xtended Flow Guard (XFG), an evolved version of Control Flow Guard (CFG), their own control flow integrity implementation. XFG works by restricting indirect control flow transfers based on type-based hashes of function prototypes. This blog post is a deep dive into how the MSVC compiler generates those XFG function prototype hashes.

This blog post analyzes the vulnerability known as "Bad Neighbor" or CVE-2020-16898, a stack-based buffer overflow in the IPv6 stack of Windows, which can be remotely triggered by means of a malformed Router Advertisement packet.