Advanced Persistent Threat (APT) is a type of network attack in which an unauthorized user gains access to a network and remains undetected for an extended period. The term implies a sophisticated level of stealth and malicious intent, often perpetrated by state actors or criminal organizations with significant resources and motives.
In the context of information security, an APT represents a severe threat due to its targeted, continuous, and stealthy nature. Attackers using APTs aim to steal data, monitor internal communications, or disrupt critical operations, rather than causing immediate damage or alarm. They typically employ a full spectrum of intrusion techniques, including social engineering, zero-day vulnerabilities, and advanced malware, to maintain persistent access to the victim's infrastructure while avoiding detection by security defenses.
Combatting APTs requires a multilayered security approach that includes endpoint protection, network security measures, continuous monitoring, and user education to recognize and respond to incidents effectively. Information security teams must also engage in proactive threat hunting to identify and remediate potential threats before they can fulfill their objectives.