ET HUNTING HTTP POST to .php on Appspot Hosting - Possible Phishing

Query · suricata

flow:established,to_server;
http.method;
content:"POST";
http.uri;
content:".php";
isdataat:!1,relative;
http.host;
content:".appspot.com";
isdataat:!1,relative; fast_pattern;
Raw source ET HUNTING HTTP POST to .php on Appspot Hosting - Possible Phishing · 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 HUNTING HTTP POST to .php on Appspot Hosting - Possible Phishing";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:".php";
    isdataat:!1,relative;
    http.host;
    content:".appspot.com";
    isdataat:!1,relative; fast_pattern;
    classtype:misc-activity;
    sid:2030708; rev:2;
    metadata:affected_product Web_Browsers, attack_target Client_Endpoint, created_at 2020_08_21, deployment Perimeter, confidence Medium, signature_severity Critical, tag Phishing, updated_at 2020_08_21, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1566, mitre_technique_name Phishing;
)

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