ET MALWARE APT28 Uploader Variant Fake Request to Google

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE APT28 Uploader Variant Fake Request to Google";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:".";
    content:"/?"; distance:0;
    content:"="; distance:1; within:3;
    pcre:"/\/\?[a-zA-Z0-9]{1,3}=(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/";
    http.header;
    content:"Content-Length|3a 20|0|0d 0a|"; fast_pattern;
    http.host;
    content:"google.com"; bsize:10;
    http.header_names;
    content:!"Content-Type|0d 0a|";
    content:!"Referer|0d 0a|";
    content:!"Accept";
    classtype:targeted-activity;
    sid:2023917; rev:6;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2016_12_07, deployment Perimeter, malware_family APT28_Uploader, performance_impact Significant, signature_severity Major, updated_at 2024_04_30;
)