An Advanced Persistent Threat (APT) is a deliberate and sustained cyber attack carried out by a highly skilled group, often state sponsored, that gains covert access to a network and maintains that access over a long period. Attackers use bespoke tools and stealth techniques to establish a foothold, move invisibly between systems and harvest valuable information without raising alarms. Their operations are carefully planned and continuously monitored to adapt to defensive measures and ensure the sustained theft of data or intelligence.
