Red Menshen, a Chinese state-sponsored threat group, has deployed an upgraded variant of BPFdoor, a kernel-level Linux backdoor, against telecommunications providers globally. The implant operates below the application layer, bypasses firewalls and port scanners without binding to any listening port, and activates only on receipt of a covert trigger packet, making it invisible to most conventional security controls. Organizations transiting sensitive communications data through telecom infrastructure face a high risk of long-term, undetected espionage.