ET MALWARE Win32/Milum CnC

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Win32/Milum CnC";
    flow:established,to_server;
    content:"|0d 0a 0d 0a|md="; fast_pattern;
    http.method;
    content:"POST";
    http.uri;
    content:".php"; endswith;
    http.content_type;
    content:"application/x-www-form-urlencoded"; bsize:33;
    http.request_body;
    content:"md="; startswith;
    content:"&nk="; distance:0;
    content:"&val="; distance:0;
    pcre:"/^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/R";
    reference:md5,17b1a05fc367e52aada7bde07714666b;
    reference:url,securelist.com/wildpressure-targets-industrial-in-the-middle-east/96360/;
    classtype:command-and-control;
    sid:2029739; rev:2;
    metadata:attack_target Client_Endpoint, created_at 2020_03_24, deployment Perimeter, malware_family Win32_Milum, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_03_25;
)