What Is an Advanced Persistent Threat

This report explains advanced persistent threats (APTs), outlines the typical attack stages (reconnaissance, spear-phishing initial access, persistence and lateral movement, command-and-control), cites real-world examples and campaigns (Lazarus, APT35, Famous Chollima, supply-chain compromises), and recommends layered defenses including SIEM/EDR, supply-chain risk management, security awareness, and incident response planning.