ET MALWARE JS Sniffer Framework Sending to CnC

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE JS Sniffer Framework Sending to CnC";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:".php?image_id="; fast_pattern;
    pcre:"/^(?:[A-Z0-9+/]{4})*(?:[A-Z0-9+/]{2}==|[A-Z0-9+/]{3}=|[A-Z0-9+/]{4})$/Ri";
    http.header_names;
    content:"Accept";
    content:"Accept-";
    content:!"Referer";
    reference:url,www.volexity.com/blog/2018/07/19/js-sniffer-e-commerce-data-theft-made-easy/;
    classtype:command-and-control;
    sid:2025881; rev:2;
    metadata:affected_product Web_Browsers, attack_target Client_Endpoint, created_at 2018_07_23, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Stealer, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_08_25;
)