We don't have synonyms for rootkit yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are root kit.
(n) :
(computer security) A set of software tools used by a third party to gain unauthorized access to a computer system and control the system while concealing itself from the user.
(v) :
(transitive) To infect (a computer system) with a rootkit.
(n) :
(computer security) A set of software tools used by a third party to gain unauthorized access to a computer system and control the system while concealing itself from the user.
(v) :
(transitive) To infect (a computer system) with a rootkit.