ET PHISHING Suspicious Generic Login - Possible Successful Phish 2019-01-02

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET PHISHING Suspicious Generic Login - Possible Successful Phish 2019-01-02";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.request_body;
    content:"myusername="; depth:11; nocase;
    content:"&mypassword="; nocase; distance:0; fast_pattern;
    classtype:credential-theft;
    sid:2026749; rev:2;
    metadata:affected_product Web_Browsers, attack_target Client_Endpoint, created_at 2019_01_02, deployment Perimeter, confidence Medium, signature_severity Critical, tag Phishing, updated_at 2020_08_27, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1566, mitre_technique_name Phishing;
)