ET MALWARE Observed AHK Downloader Request Structure

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Observed AHK Downloader Request Structure";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"/traff.php"; endswith; fast_pattern;
    http.user_agent;
    content:"AutoHotkey"; bsize:10;
    http.header_names;
    content:"|0d 0a|User-Agent|0d 0a|Connection|0d 0a|Cache-Control|0d 0a|Host|0d 0a 0d 0a|";
    classtype:trojan-activity;
    sid:2028956; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_11_08, deployment Perimeter, performance_impact Moderate, confidence High, signature_severity Minor, tag Downloader, updated_at 2019_11_08;
)