ET MALWARE Win32/ASPC Bot CnC Checkin M2

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Win32/ASPC Bot CnC Checkin M2";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:".php?key="; fast_pattern;
    content:"&string="; distance:0;
    pcre:"/\.php\?key=[^\r\n]+&string=[^\r\n]+?(?:\x3a\x3a[^\x3a]+?){5,}$/i";
    http.user_agent;
    content:"Mozilla/"; startswith;
    http.request_body;
    content:"key="; depth:4;
    content:"&string="; distance:0;
    http.header_names;
    content:!"Referer|0d 0a|";
    reference:md5,15167239effdfb68bb10467eeea2f24d;
    classtype:command-and-control;
    sid:2024321; rev:3;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_05_18, deployment Perimeter, malware_family ASPC_Bot, performance_impact Moderate, confidence High, signature_severity Major, updated_at 2020_08_06;
)