ET HUNTING Javascript Mobile Device Check

Query · suricata

flow:established,to_client;
http.response_body;
content:"function|20|ismobile"; nocase; fast_pattern;
content:"navigator.userAgent";
content:"|7c|iPhone|7c|";
threshold:type limit,count 1,seconds 300,track by_src;
target:dest_ip;
Raw source ET HUNTING Javascript Mobile Device Check · Suricata
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Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET HUNTING Javascript Mobile Device Check";
    flow:established,to_client;
    http.response_body;
    content:"function|20|ismobile"; nocase; fast_pattern;
    content:"navigator.userAgent";
    content:"|7c|iPhone|7c|";
    threshold:type limit,count 1,seconds 300,track by_src;
    classtype:misc-activity;
    sid:2070079; rev:1;
    metadata:affected_product Web_Browsers, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2026_06_26, deployment Perimeter, deployment SSLDecrypt, performance_impact Significant, confidence High, signature_severity Informational, updated_at 2026_06_26, mitre_tactic_id TA0005, mitre_tactic_name Defense_Evasion, mitre_technique_id T1205, mitre_technique_name Traffic_Signaling;
    target:dest_ip;
)

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