Cybersecurity products use kernel drivers to load security agents into protected processes (e.g., LSASS) to prevent tampering [2].
Microsoft’s PatchGuard protects critical kernel data structures from modification, often triggering a BSOD if tampering is detected. kernel dll injector
A operates at the highest privilege level of the operating system (Ring 0 in Windows). This approach offers unprecedented control, deep stealth, and the ability to bypass standard user-mode hooks. 1. What is a Kernel DLL Injector? Cybersecurity products use kernel drivers to load security
User-mode uses VirtualAllocEx . Kernel-mode uses ZwAllocateVirtualMemory (which is actually a system service that transitions to the kernel). Inside a driver, the injector calls this with the target process’s EPROCESS pointer. Because the call originates in Ring 0, access checks are minimal. User-mode uses VirtualAllocEx
Kernel mode can bypass process access restrictions, such as Protected Process Light (PPL), allowing injection into system processes that user-mode applications cannot touch.
Manually parses and writes the PE file directly into the target memory.
To execute the DLL inside the target process, the memory pages of the DLL must be accessible to that process. Kernel injectors achieve this through two primary methods: