ET PHISHING Generic AiTM Fingerprint Exfil

Query · suricata

flow:established,to_server;
http.method;
content:"POST";
http.content_type;
content:"application/x-www-form-urlencoded|3b|charset=UTF-8";
http.content_len;
byte_test:0,<=,160000,0,string,dec;
http.request_body;
content:"analytics=%7B%22screen%22%3A%7B%22availWidth%22%3A"; startswith; fast_pattern;
content:"RTCRtpScriptTransform";
Raw source ET PHISHING Generic AiTM Fingerprint Exfil · 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 PHISHING Generic AiTM Fingerprint Exfil";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.content_type;
    content:"application/x-www-form-urlencoded|3b|charset=UTF-8";
    http.content_len;
    byte_test:0,<=,160000,0,string,dec;
    http.request_body;
    content:"analytics=%7B%22screen%22%3A%7B%22availWidth%22%3A"; startswith; fast_pattern;
    content:"RTCRtpScriptTransform";
    classtype:social-engineering;
    sid:2071419; rev:1;
    metadata:attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2026_08_07, deployment Perimeter, deployment SSLDecrypt, confidence Low, signature_severity Major, tag Phishing, tag AiTM, updated_at 2026_08_07, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1566, mitre_technique_name Phishing;
)

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