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A rootkit is a set of software tools intended to conceal running processes, files or system data, thereby helping an intruder to maintain access to a system whilst avoiding detection. Rootkits are known to exist for a variety of operating systems such as Linux, Solaris and versions of Microsoft Windows. Rootkits often modify parts of the operating system or install themselves as drivers or kernel modules.

The word "rootkit" came to public awareness in the 2005 Sony CD copy protection scandal, in which Sony BMG music CDs surreptitiously placed a rootkit on Microsoft Windows PCs when the CD was played on the computer. Sony provided no mention of this in the CD or its packaging, referring only to security rights management measures. Spyware Detector can remove AaaBestHomepage, and thousands of other Spyware definitions, automatically and instantly.

Origins

The term "rootkit" (also written as "root kit") originally referred to a set of recompiled Unix tools such as "ps", "netstat", "w" and "passwd" that would carefully hide any trace of the intruder that those commands would normally display, thus allowing the intruders to maintain "root" on the system without the system administrator even seeing them.

Generally now the term is not restricted to Unix-based operating systems, as tools that perform a similar set of tasks now exist for non-Unix operating systems such as Microsoft Windows, regardless of the existence of a "root" account in the operating system.

Common use

A rootkit is often used to hide utilities. These are often used to abuse a compromised system, include so-called "backdoors" to help the attacker subsequently access the system more easily. For example, the rootkit may hide an application that spawns a shell when the attacker connects to a particular network port on the system. Once the search is conducted.