ET MALWARE Backdoor.Elise Style IP Check

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Backdoor.Elise Style IP Check";
    flow:to_server,established;
    urilen:16;
    http.uri;
    content:"/myip?format=txt";
    http.user_agent;
    content:"Mozilla/4.0 (compatible|3b 20|MSIE 8.0|3b 20|Windows NT 6.1|3b 20|Trident/4.0|3b 20|SLCC2|3b 20|.NET CLR 2.0.50727|3b 20|.NET CLR 3.5.30729|3b 20|.NET CLR 3.0.30729|3b 20|Media Center PC 6.0|3b 20|.NET4.0C|3b 20|.NET4.0E)";
    http.host;
    content:"api.ipaddress.com"; fast_pattern;
    http.header_names;
    content:"|0d 0a|Connection|0d 0a|User-Agent|0d 0a|Host|0d 0a 0d 0a|";
    reference:md5,f12fc711529b48bcef52c5ca0a52335a;
    reference:url,community.rsa.com/community/products/netwitness/blog/2018/01/30/apt32-continues-asean-targeting;
    classtype:trojan-activity;
    sid:2025289; rev:3;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2018_02_01, deployment Perimeter, malware_family elise, performance_impact Moderate, confidence High, signature_severity Major, updated_at 2020_08_24;
)