An advanced persistent threat (APT) is a classy, sustained cyberattack in which an intruder establishes an undetected existence inside a network so as to steal delicate facts above a prolonged time period. Intrusion detection techniques produce a databases of known attack methods to detect patterns and thwart any similar incidents https://www.researchgate.net/publication/365308473_Development_of_Cyber_Attack_Model_for_Private_Network