This document contains the slides from a presentation given by WonoKaerun at the Indonesian Security Conference 2011 in Palembang. The presentation introduces rootkits and techniques for hiding malware at the kernel level on Linux systems. It covers topics like loadable kernel modules, interrupt descriptor table hooking, virtual file system hacking, page fault handler hijacking, debugging register abuse, and kernel instrumentation patching. The goal is to evade detection by security solutions by gaining control of the kernel before anti-rootkit defenses can activate. Throughout, the document emphasizes the cat-and-mouse nature of offensive and defensive security research.