ET MALWARE ShadowLink IoT Botnet Socks Proxy Registration Attempt

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:"/reg|3f|ip|3d|"; startswith; fast_pattern;
pcre:"/^(?:\d{1,3}\x2e){3}\d{1,3}/R";
content:"|26|port|3d|";
pcre:"/^\d{1,5}$/R";
target:src_ip;
Raw source ET MALWARE ShadowLink IoT Botnet Socks Proxy Registration Attempt · 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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE ShadowLink IoT Botnet Socks Proxy Registration Attempt";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"/reg|3f|ip|3d|"; startswith; fast_pattern;
    pcre:"/^(?:\d{1,3}\x2e){3}\d{1,3}/R";
    content:"|26|port|3d|";
    pcre:"/^\d{1,5}$/R";
    reference:url,ctrlaltintel.com/research/ProxyPCP/;
    classtype:trojan-activity;
    sid:2068765; rev:1;
    metadata:affected_product IoT, attack_target Networking_Equipment, tls_state plaintext, created_at 2026_04_14, deployment Perimeter, malware_family ShadowLink, performance_impact Low, 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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