ET MALWARE BPFDoor TCP Magic Packet (Inbound) M6

Query · suricata

flow:established,to_server;
dsize:24;
content:"|39 39 39 39|"; startswith; fast_pattern;
content:"|73|"; offset:10; depth:1;
pcre:"/^[a-z0-9_]{1,14}\x00*$/Ri";
Raw source ET MALWARE BPFDoor TCP Magic Packet (Inbound) M6 · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert tcp any any -> $HOME_NET any (
    msg:"ET MALWARE BPFDoor TCP Magic Packet (Inbound) M6";
    flow:established,to_server;
    dsize:24;
    content:"|39 39 39 39|"; startswith; fast_pattern;
    content:"|73|"; offset:10; depth:1;
    pcre:"/^[a-z0-9_]{1,14}\x00*$/Ri";
    reference:url,trendmicro.com/en_us/research/25/d/bpfdoor-hidden-controller.html?ref=haxrob.net;
    reference:url,haxrob.net/bpfdoor-past-and-present-part-2/;
    reference:url,trendmicro.com/en_us/research/23/g/detecting-bpfdoor-backdoor-variants-abusing-bpf-filters.html;
    classtype:command-and-control;
    sid:2065014; rev:2;
    metadata:affected_product Linux, affected_product MySQL, attack_target Client_and_Server, tls_state TLSDecrypt, created_at 2025_09_30, deployment Perimeter, performance_impact Low, confidence Medium, signature_severity Major, tag Backdoor, tag Description_Generated_By_Proofpoint_Nexus, tag BPF, updated_at 2025_10_02, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
)

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