ET MALWARE Win32/Upgilf CnC Beacon

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Win32/Upgilf CnC Beacon";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"2E";
    content:"2E"; distance:0;
    content:"2E"; distance:0;
    content:"00000000000000000000"; fast_pattern;
    pcre:"/^\/[A-F0-9]+$/";
    http.user_agent;
    content:"Windows NT"; distance:0;
    http.header_names;
    content:!"Accept";
    content:!"Referer|0d 0a|";
    content:"|0d 0a|User-Agent|0d 0a|"; startswith;
    reference:md5,c049f2884bf2dfca9496f075216af431;
    classtype:command-and-control;
    sid:2036993; rev:4;
    metadata:attack_target Client_Endpoint, created_at 2016_05_05, deployment Perimeter, malware_family Win32_Upgilf, signature_severity Major, tag c2, updated_at 2020_10_06, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
)