alert tcp $EXTERNAL_NET any -> $HOME_NET [22,80,443] (msg:"ET MALWARE BPFDoor V2 TCP Magic Packet Inbound"; flow:established,to_server; content:"|44 30 cd 9f 5e 14 27 66|"; reference:url,www.deepinstinct.com/blog/bpfdoor-malware-evolves-stealthy-sniffing-backdoor-ups-its-game; classtype:trojan-activity; sid:2045672; rev:1; metadata:attack_target Client_Endpoint, created_at 2023_05_11, deployment Perimeter, malware_family BPFDoor, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_05_11; target:dest_ip;)