ET PHISHING Generic Credential Phish Fingerprinting Activity (Base64 Vars Detected &rand=, &sv=, &uid=)

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET PHISHING Generic Credential Phish Fingerprinting Activity (Base64 Vars Detected &rand=, &sv=, &uid=)";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:"cmFuZDE9"; startswith; fast_pattern;
    content:"SZzdj1";
    content:"0mdWlkPV";
    reference:url,any.run/cybersecurity-blog/analysis-of-the-phishing-campaign/;
    classtype:credential-theft;
    sid:2056317; rev:1;
    metadata:attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2024_09_27, deployment Perimeter, deployment SSLDecrypt, confidence Medium, signature_severity Major, tag Phishing, updated_at 2024_09_27, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1566, mitre_technique_name Phishing;
)