ET MALWARE Bamital Checkin

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Bamital Checkin";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    pcre:"/^\/[a-z0-9.&-]+(?:[a-z0-9]{4}-){3}[a-z0-9.&+-]+$/i";
    http.user_agent;
    content:"Mozilla/5.0 (compatible|3b 20|MSIE 9.0|3b 20|Windows NT 6.1|3b 20|WOW64|3b 20|Trident/5.0)"; fast_pattern;
    http.header_names;
    content:!"Referer";
    content:!"Accept-";
    classtype:command-and-control;
    sid:2019756; rev:5;
    metadata:created_at 2014_11_20, signature_severity Major, updated_at 2020_08_17;
)