ET MALWARE Win64/Agent.NL Variant CnC Activity

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Win64/Agent.NL Variant CnC Activity";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:"/getconfig.php?r="; fast_pattern;
    pcre:"/^[0-9]+$/R";
    http.content_type;
    content:"application/json"; bsize:16;
    http.header_names;
    content:!"|0d 0a|Referer|0d 0a|";
    content:!"|0d 0a|User-Agent|0d 0a|";
    http.request_body;
    content:"|7b 22|data|22 3a 22|"; startswith;
    content:!"|3a|"; distance:0;
    reference:md5,d37bb6fc88cd71f86a3d4211a064d80b;
    classtype:command-and-control;
    sid:2034580; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_12_03, deployment Perimeter, malware_family Win64_Agent_NL, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_12_03;
)