Yarden is a senior security researcher at Trail of Bits and a consultant for Winsider Seminars & Solutions Inc., co-teaching security trainings. Previously she worked at CrowdStrike and SentineOne, working on EDR features and Windows research.
Outside of her primary work duties, Yarden writes articles and tools and gives talks about various topics such as Pool internals, CET internals, extension host hooking and kernel exploits and mitigations.
Outside of infosec, Yarden is a circus artist, teaching and performing aerial arts.
Covering Windows 11 “22H2”, the upcoming “23H2”, and Server 2022, you’ll unravel the secrets of how bootkits, software supply chain implants, backdoors, and other kernel and firmware malware work. You’ll learn how they, and others, abuse various system functionality, obscure mechanisms, and data structures, in order to do their dirty work, and how you can too defend against it!
You’ll observe and experiment with how kernel-mode code operates and how it can be subject to compromise by user-mode attackers wishing to elevate their privileges, as well as how to detect, both live and forensically, such attempts. Finally, you’ll learn about how CPU architecture deeply ties into OS design, and how Intel’s and AMD’s mistakes can lead to more pwnage.
We’ll cover the new Windows 11 kernel changes, including Kernel Data Protection (KDP), eXtended Control Flow Guard (XFG), and Kernel Control-flow Enforcement Technology (KCET), and explain how the Trusted Platform Module (TPM) is used for Measured Boot. We’ll go inside the Octagon and learn about System Guard Runtime Assertions and the rewritten Secure Launch framework that leverages Intel TXT and AMD SKINIT for new DRTM-based attestation.
Of course, we’ll also discuss key Windows 10 fundamentals such as Virtual Trust Levels (VTL) combined with Virtualization Based Security (VBS), and how these technologies allow Hyper Visor Code Integrity (HVCI) and Kernel Control Flow Guard (KCFG) to prevent unsigned kernel code execution, even when faced with Ring 0 vulnerabilities, while also powering Biometric Isolation and Credential Guard, make pass-the-hash attacks virtually impossible. Enclaves and Attestation, both through Software Guard Extensions (SGX) and VBS, and TPM-based Measured Boot, will also be on the menu.
Windows 10 builds upon many Windows 8.1 mechanisms such as Protected Process Light and custom Code Signing Policies, so we’ll review this as well, plus new Windows 8 kernel features (AppContainer, Secure Boot, and more) relevant to driver operation and exploitation techniques will be discussed, including an overview of over two dozen new security mitigations that have been added to the operating system.
We’ll see how these changes to the architecture have dramatically constrained exploit techniques. Windows 7 kernel changes will be discussed too, such as the new Object Manager data structures.
Throughout the class, we’ll focus on using various techniques and tools to inspect the Windows kernel for consistency, tracing its operation, and editing it, as well as ways in which offensive and defensive attackers can mess with the system’s state in unexpected, “clean” ways. We’ll also give several examples of malicious and/or buggy drivers in a typical Windows system, as well as architectural bugs over Windows’ lifetime.
Attendees will receive a physical handout of the entire course materials for future reference, plus a full set of 40+ WinDbg scripts, and all commands/outputs that were used in the course. Live paste-board sharing will be available to facilitate learning.
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