HookChain A new perspective for Bypassing EDR Solutions
Helvio Carvalho Junior
DEF CON 32 Main Stage · Day 1 · Main Stage
In the ever-escalating arms race between attackers and defenders, Endpoint Detection and Response (EDR) and Extended Detection and Response (XDR) solutions are critical components of modern cybersecurity strategies. However, the pervasive belief that these systems offer 100% protection is a dangerous misconception, as eloquently articulated by Helvio Carvalho Junior in his DEF CON 32 talk, "HookChain: A new perspective for Bypassing EDR Solutions." This presentation introduces HookChain, a novel technique designed to bypass the monitoring capabilities of EDRs and XDRs by manipulating user-land hooks within the Windows `NTDLL.dll`.
AI review
Helvio Carvalho Junior's "HookChain" presents a truly elegant and impactful technique for bypassing user-land EDR hooks in NTDLL.dll on 64-bit Windows. By resolving System Service Numbers (SSNs) and crafting custom syscall stubs, HookChain effectively creates its own clean path to the kernel, completely circumventing EDR monitoring. This isn't just another unhooking trick; it's a fundamental re-evaluation of how EDRs are being defeated, demonstrating a profound understanding of Windows internals and forcing a critical re-assessment of defensive strategies that rely solely on user-mode API…