An advanced persistent threat (APT) is a sophisticated, sustained cyberattack during which an intruder establishes an undetected existence inside of a network as a way to steal delicate information over a protracted time period. Moreover, a bit about sixty six% of respondents noted to own had numerous, isolated bacterial infections.” https://www.researchgate.net/publication/365308473_Development_of_Cyber_Attack_Model_for_Private_Network