ET MALWARE Common RAT Connectivity Check Observed

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Common RAT Connectivity Check Observed";
    flow:to_server,established;
    urilen:6;
    http.user_agent;
    content:"Mozilla/5.0 (Windows NT 6.3|3b 20|rv|3a|48.0) Gecko/20100101 Firefox/48.0"; depth:65;
    http.host;
    content:"ip-api.com"; depth:10; endswith;
    http.request_line;
    content:"GET /json/"; depth:10; fast_pattern;
    http.connection;
    content:"Keep-Alive"; depth:10; endswith;
    http.header_names;
    content:"|0d 0a|User-Agent|0d 0a|Host|0d 0a|Connection|0d 0a 0d 0a|"; depth:34; endswith;
    reference:md5,69aeb53d5d8792e5479966aeed917bc4;
    classtype:trojan-activity;
    sid:2036383; rev:5;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2016_12_07, deployment Perimeter, malware_family Qasar_Rat, malware_family AZORult, malware_family VoidRat, confidence High, signature_severity Major, updated_at 2020_11_11;
)