ET MALWARE BPFDoor Direct Connection Client Response (Outbound)

Query · suricata

flow:established,to_client;
dsize:4;
flags:PA;
window:510;
content:"|33 34 35 38|";
Raw source ET MALWARE BPFDoor Direct Connection Client Response (Outbound) · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert tcp $HOME_NET any -> any any (
    msg:"ET MALWARE BPFDoor Direct Connection Client Response (Outbound)";
    flow:established,to_client;
    dsize:4;
    flags:PA;
    window:510;
    content:"|33 34 35 38|";
    reference:url,www.trendmicro.com/en_us/research/25/d/bpfdoor-hidden-controller.html;
    classtype:command-and-control;
    sid:2065015; rev:1;
    metadata:affected_product Linux, affected_product MySQL, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2025_09_30, deployment Perimeter, confidence Medium, signature_severity Major, tag Backdoor, tag BPF, updated_at 2025_10_01, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
)

Detection rules belong to the projects that publish them and remain under their own licenses. This site indexes and links to them; it claims no rights in them.