ET MALWARE ShadowLink IoT Botnet CnC Checkin Attempt M1 (Asus Variant)

Query · suricata

flow:established,to_server;
http.method;
content:"POST";
http.uri; bsize:5;
content:"/b/in";
http.header;
content:"X-B|3a 20|"; fast_pattern;
http.request_body;
content:"|22|h|22|";
content:"|22|u|22|";
content:"|22|root|22|"; within:10;
content:"|22|o|22|";
content:"|22|ASUSWRT"; within:15;
target:src_ip;
Raw source ET MALWARE ShadowLink IoT Botnet CnC Checkin Attempt M1 (Asus Variant) · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE ShadowLink IoT Botnet CnC Checkin Attempt M1 (Asus Variant)";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri; bsize:5;
    content:"/b/in";
    http.header;
    content:"X-B|3a 20|"; fast_pattern;
    http.request_body;
    content:"|22|h|22|";
    content:"|22|u|22|";
    content:"|22|root|22|"; within:10;
    content:"|22|o|22|";
    content:"|22|ASUSWRT"; within:15;
    reference:url,ctrlaltintel.com/research/ProxyPCP/;
    classtype:trojan-activity;
    sid:2068764; rev:1;
    metadata:affected_product IoT, attack_target Networking_Equipment, tls_state TLSDecrypt, created_at 2026_04_14, deployment Perimeter, deployment SSLDecrypt, malware_family ShadowLink, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2026_04_14, mitre_tactic_id TA0037, mitre_tactic_name Command_And_Control, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
    target:src_ip;
)

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