ET MALWARE Kronos Checkin

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Kronos Checkin";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:".php";
    http.header;
    content:"Content-Length|3a 20|74|0d 0a|"; fast_pattern;
    http.request_body;
    pcre:"/^(?P<v1>.).{33}(?P=v1).{9}(?P<v2>.)(?:.{4}(?P=v2)){3}/s";
    http.header_names;
    content:!"Referer|0d 0a|";
    content:!"Accept";
    content:!"Content-Type";
    classtype:command-and-control;
    sid:2020080; rev:4;
    metadata:created_at 2014_12_29, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_09_29;
)