Bypassing PatchGuard on Windows x64 (2005)
Summary
This historical paper analyzes PatchGuard on Windows x64, detailing how the kernel patch protection guards critical structures (SSDT, GDT/IDT, MSRs, and system images) and describing obfuscation and various bypass approaches. It presents deep technical mechanisms, misdirection tactics, and potential mitigations, while acknowledging the ongoing cat-and-mouse dynamics of security research and the risks of disseminating bypass methods. The document also discusses ethical and practical implications for vendors, researchers, and system stability.