A Root Kit is a particularly vicious threat vector. The malicious code's main attribute is that it's closer to the administrative level of a computer or network's operating system and is likely to be more invisible from normal examination. Yet the presence of an attacker is capable of being concealed while still initiating operations in your computer about which you are unaware. Once a system or network in compromised access can be given to other attackers.
Its Relevance: Nefarious software that can gain administrative level access to information infrastructure is particularly insidious. The attack can continue for an unlimited amount of time and be expanded upon. Unknown to the user, for example, every key stroke that is entered could be forwarded to the intruder.
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