ET MALWARE Andromeda Checkin

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Andromeda Checkin";
    flow:established,to_server;
    http.method;
    content:"POST"; nocase;
    http.content_type;
    content:"application/x-www-form-urlencoded"; bsize:33;
    http.header;
    content:"User-Agent|3a 20|Mozilla/4.0|0d 0a|";
    http.content_len;
    byte_test:0,>,60,0,string,dec;
    byte_test:0,<,150,0,string,dec;
    http.connection;
    content:"close"; bsize:5;
    http.request_body;
    pcre:"/^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})([\r\n](?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4}))?$/i";
    http.header_names;
    content:!"|0d 0a|Referer|0d 0a|";
    content:!"|0d 0a|Accept";
    reference:md5,41c33fdb9a95353a3b109393543f90dd;
    classtype:command-and-control;
    sid:2016223; rev:13;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2012_03_30, deployment Perimeter, performance_impact Moderate, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_11_10, reviewed_at 2024_03_19;
)