ET MALWARE Malicious Chrome Extension Requesting Websocket

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Malicious Chrome Extension Requesting Websocket";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.header;
    content:"Upgrade|3a 20|websocket|0d 0a|";
    content:"Origin|3a 20|chrome-extension|3a|//ppmibgfeefcglejjlpeihfdimbkfbbnm|0d 0a|"; fast_pattern;
    http.header_names;
    content:!"Referer";
    reference:url,icebrg.io/blog/malicious-chrome-extensions-enable-criminals-to-impact-over-half-a-million-users-and-global-businesses;
    classtype:trojan-activity;
    sid:2025220; rev:2;
    metadata:affected_product Any, attack_target Client_Endpoint, created_at 2018_01_18, deployment Perimeter, performance_impact Moderate, confidence High, signature_severity Major, updated_at 2020_08_24;
)