Rootkits are the ultimate backdoor, giving hackers ongoing and virtually undetectable access to the systems they exploit. Now, two of the world's leading experts have written the first comprehensive guide to rootkits: what they are, how they work, how to build them, and how to detect them. Rootkit.com's Greg Hoglund and James Butler created and teach Black Hat's legendary course in rootkits. In this book, they reveal never-before-told offensive aspects of rootkit technology - learn how attackers can get in and stay in for years, without detection.Hoglund and Butler show exactly how to subvert the Windows XP and Windows 2000 kernels, teaching concepts that are easily applied to virtually any modern operating system, from Windows Server 2003 to Linux and UNIX. Using extensive downloadable examples, they teach rootkit programming techniques that can be used for a wide range of software, from white hat security tools to operating system drivers and debuggers.After reading this book, readers will be able toUnderstand the role of rootkits in remote command/control and software eavesdroppingBuild kernel rootkits that can make processes, files, and directories invisibleMaster key rootkit programming techniques, including hooking, runtime patching, and directly manipulating kernel objectsWork with layered drivers to implement keyboard sniffers and file filtersDetect rootkits and build host-based intrusion prevention software that resists rootkit attacksVisit rootkit.com for code and programs from this book. The site also contains enhancements to the book's text, such as up-to-the-minute information on rootkits available nowhere else.