ET MOBILE_MALWARE Android Vultr Checkin

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MOBILE_MALWARE Android Vultr Checkin";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:"/grpc.Rpc/Registration"; fast_pattern;
    isdataat:!1,relative;
    http.user_agent;
    content:"grpc-java-okhttp/";
    http.header_names;
    content:!"|0d 0a|Referer|0d 0a|";
    reference:url,www.threatfabric.com/blogs/vultur-v-for-vnc.html;
    classtype:command-and-control;
    sid:2033730; rev:3;
    metadata:attack_target Mobile_Client, created_at 2021_08_13, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_21, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
)