An Advanced Persistent Threat (APT) is a long-term, well-resourced — often state-backed — attacker group that maintains covert access over extended periods.
In detail
APTs prioritize stealth and persistence over quick gains.
They often use custom, non-public infrastructure, which means signature-based detection alone misses them — behavioral analysis on the network is needed to spot the anomalies they create.
Last updated: 5 June 2026 · 4 min read