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A rootkit is a computer virus which consists of a program (or combination of several programs) designed to take fundamental control (in Unix terms "root" access, in Windows "Administrator" access) of a computer system, without authorization by the system's owners and legitimate managers. Access to the hardware (e.g., the reset switch) is rarely required as a rootkit is intended to seize control of the operating system running on the hardware. Typically, rootkits act to obscure their presence on the system through subversion or evasion of standard operating system security mechanisms. Often, they are Trojans as well, thus fooling users into believing they are safe to run on their systems. Techniques used to accomplish this can include concealing running processes from monitoring programs, or hiding files or system data from the operating system.
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Wikipedia about rootkit
A rootkit is a computer virus which consists of a program (or combination of several programs) designed to take fundamental control (in Unix terms "root" access, in Windows "Administrator" access) of a computer system, without authorization by the system's owners and legitimate managers. Access to the hardware (e.g., the reset switch) is rarely required as a rootkit is intended to seize control of the operating system running on the hardware. Typically, rootkits act to obscure their presence on the system through subversion or evasion of standard operating system security mechanisms. Often, they are Trojans as well, thus fooling users into believing they are safe to run on their systems. Techniques used to accomplish this can include concealing running processes from monitoring programs, or hiding files or system data from the operating system.
Rootkits may have originated as regular applications, intended to take control of a failing or unresponsive system, but in recent years have been largely malware to help intruders gain access to systems while avoiding detection. Rootkits exist for a variety of operating systems, such as Microsoft Windows, Linux, Mac OS, and Solaris. Rootkits often modify parts of the operating system or install themselves as drivers or kernel modules, depending on the internal details of an operating system's mechanisms.
History
The term rootkit or root kit originally referred to a maliciously modified set of administrative tools for a Unix-like operating system. If an intruder could replace the standard administrative tools on a system with a rootkit, the modified tools would give the intruder administrative control over the system while concealing his activities from the legitimate system administrator. The earliest known rootkit was written circa 1990 by Lane Davis and Steven Dake for SunOS 4.1.1.Fact: date=August 2008 There was an earlier, quite famous, exploit equivalent to a rootkit which was perpetrated by Ken Thompson of Bell Labs against a Naval Laboratory in California to win a bet. Thompson subverted the C compiler in a distribution of Unix to the Lab.
Rootkits were so named because they allowed an intruder to become a root user (ie, the system administrator) of a Unix system. Since then, similar software has been developed for other operating systems, and the term rootkit has been broadened to include any software that surreptitiously alters an operating system so that an unauthorized user can take arbitrary control of the system.
In 2005, Sony BMG caused a scandal by including rootkit software on music CDs that, in an attempt to enforce DRM, inadvertently opened a backdoor that allowed root access to anyone aware of the rootkit's installation. The scandal raised the public's awareness of rootkits, while the public relations fallout for Sony was compared by one analyst to the Tylenol scare.
























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