ET MALWARE Zeus.Downloader Campaign Unknown Initial CnC Beacon

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Zeus.Downloader Campaign Unknown Initial CnC Beacon";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:"/ppp/ta.php"; fast_pattern;
    http.header;
    pcre:"/Host\x3A\x20\d{1,3}\x2E\d{1,3}\x2E\d{1,3}\x2E\d{1,3}/";
    reference:md5,ca15e5e96aee8b18ca6f3c185a690cea;
    classtype:command-and-control;
    sid:2018183; rev:6;
    metadata:attack_target Client_Endpoint, created_at 2014_02_27, deployment Perimeter, confidence Medium, signature_severity Major, tag c2, updated_at 2020_09_25, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
)