ET MALWARE Win32/ASPC Bot CnC Checkin M3

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Win32/ASPC Bot CnC Checkin M3";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:".php?string="; fast_pattern;
    pcre:"/\.php\?string=[a-zA-Z0-9+=]+$/i";
    http.user_agent;
    content:"Mozilla/"; startswith;
    http.request_body;
    content:"string="; depth:7;
    http.header_names;
    content:!"Referer|0d 0a|";
    reference:md5,f392c55f636e93f4b72f1a2aa5022730;
    classtype:command-and-control;
    sid:2024625; rev:5;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_08_30, deployment Perimeter, malware_family Win32_ASPC, performance_impact Moderate, confidence High, signature_severity Major, updated_at 2020_08_12;
)