UNC3886 Tactics, Techniques, and Procedures: Full Technical Breakdown

UNC3886 is a China-linked APT active in 2025 that targets strategic and critical infrastructure (energy, telecom, healthcare, transportation) across Asia, Europe, and North America; the report details use of zero-day exploits in Fortinet/VMware/Juniper, kernel rootkits and malware families (TinyShell, Melofee, REPTILE) to achieve stealthy persistence, encrypted C2 on non-standard ports, credential theft, and exfiltration, and maps these behaviors to MITRE ATT&CK while demonstrating Picus Platform simulations to expose detection gaps and validate defenses.