BPFDoor - S1161 (8d1f89fd-4dde-40ab-80e0-a7b80249162e)
BPFDoor is a Linux based passive long-term backdoor used by China-based threat actors. First seen in 2021, BPFDoor is named after its usage of Berkley Packet Filter (BPF) to execute single task instructions. BPFDoor supports multiple protocols for communicating with a C2 including TCP, UDP, and ICMP and can start local or reverse shells that bypass firewalls using iptables.(Citation: Sandfly BPFDoor 2022)(Citation: Deep Instinct BPFDoor 2023)