What is the fine-grained topic of the following text: Learn the internals of the Windows NT kernel architecture, including Windows 8.1 and Server 2012, in order to learn how rootkits, PLA implants, NSA backdoors, and other kernel-mode malware exploit the various system functionalities, mechanisms and data structures to do their dirty work. Only return the topic.
Exploring Windows NT kernel architecture to understand kernel-mode malware exploits