malicious software that allows an unauthorized user to maintain access to a computer by concealing programs and processes, files, or data from the operating system.
verb (used with or without object), rootkitted, rootkitting.
to install such software on (a computer, electronic device, etc.):
I think my system has been rootkitted.
(computing) a set of programs used to gain unauthorized access to a computer’s operating system, esp in order to destroy or alter files, attack other computers, etc


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