The book discusses about the various malware families, what approach has been applied to detect such malware. Data Mining has been used as tool for analysis of malware across many families. The book talks about feature selection and mining of their hierarchy for the Rookit family of malware. This family of malware attacks the system files which effect the smooth functioning of operating systems. The word "root" in root kit is a synonymous with the root rights that any administrator has over any operating system such as Unix. The manuscript further reveals the relationship between the features of Rootkit family of malware.