This document discusses using WinDbg for kernel debugging and analyzing rootkits. It explains that WinDbg can debug in both user-mode and kernel-mode, unlike OllyDbg which is only for user-mode. Device drivers run code in the Windows kernel and are difficult to analyze. The DriverEntry routine is called when a driver is loaded and it registers callback functions. Malware often imports functions from Ntoskrnl.exe and Hal.dll to manipulate the kernel. WinDbg commands like bp, lm, and dt are demonstrated for setting breakpoints, listing modules, and viewing structures. Symbol files from Microsoft provide function and structure names to make debugging easier.