China-Linked Red Menshen Uses Stealthy BPFDoor Implants to Spy via Telecom Networks

A long-running China-linked espionage campaign attributed to Red Menshen (aka Earth Bluecrow) has implanted stealthy 'BPFDoor' access mechanisms inside telecommunications networks to conduct surveillance against government targets. The activity involves strategic positioning and persistent, hard-to-detect kernel/packet-filter level implants within critical telco infrastructure, enabling broad interception, lateral access into victim networks, and long-term covert access. This presents a high-impact national-security risk for telecom operators and government customers and requires urgent threat