Dll Injector - Kernel

Drafting a kernel-mode DLL injector involves creating a Windows Kernel Driver (.sys) that operates at a higher privilege level than standard user-mode injectors. This allows it to bypass certain security protections like anti-cheat software or EDRs. Core Technical Workflow

process memory after the injection is complete to prevent post-mortem forensic analysis. Feature Summary Table Feature Type Specific Feature VAD Hiding kernel dll injector

Background

Context Attachment: Drivers use KeStackAttachProcess to temporarily join the virtual address space of the target process, allowing them to read or write memory as if they were part of that process. Technical Comparison DLL Injection with CreateRemoteThread Drafting a kernel-mode DLL injector involves creating a

The Counter-Countermeasure: Sophisticated injectors then attempt to unhook these callbacks or exploit the fact that Windows has a complex structure called KPP (Kernel Patch Protection), or "PatchGuard." PatchGuard is designed by Microsoft to crash the system if it detects critical kernel structures being modified. Attackers must navigate a minefield where one wrong step results in the infamous Blue Screen of Death (BSOD). Isolated lab with instrumented Windows VM, vulnerable driver

Kernel DLL Injection: A Deep Technical Review

Introduction

User-mode DLL injection (e.g., CreateRemoteThread + LoadLibrary) is a well-trodden path for API hooking, extensibility, and unfortunately, malware. Kernel DLL injection takes this concept into Ring 0 — the highest privilege level on Windows. Instead of injecting into a remote process, the goal here is often to load a DLL into a specific process from kernel mode, or to force a kernel DLL into a user process’s address space under the kernel’s authority.

  1. The kernel driver reads the DLL from disk (or memory) and parses its PE headers.
  2. It allocates memory in the target process for each section (.text, .data, .rdata).
  3. It resolves imports by walking the target process’s loaded module list.
  4. It applies base relocations.
  5. It calls the DLL’s entry point (DllMain) by creating a remote thread or using a kernel APC.

By operating in the kernel, the injector can access and modify the memory of any process, including protected system processes, without the restrictions imposed on user-mode applications. This capability is often sought after by developers of security software, system utilities, and, in some cases, by those looking to evade detection by anti-cheat or anti-malware programs. How Kernel DLL Injection Works