ET MALWARE Win32/Backdoor.YesMaster CnC Checkin

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Win32/Backdoor.YesMaster CnC Checkin";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.header;
    content:"x-user-agent|3a 20|YesMaster|0d 0a|"; fast_pattern;
    http.header_names;
    content:"|0d 0a|x-user-agent|0d 0a|";
    content:"|0d 0a|x-whoami|0d 0a|";
    content:"|0d 0a|x-pwd|0d 0a|";
    content:"|0d 0a|x-hostname|0d 0a|";
    content:"|0d 0a|x-isadm|0d 0a|";
    content:"|0d 0a|x-is64Env|0d 0a|";
    content:!"User-Agent";
    reference:md5,4941501aca63cb8bdc86dadeffc9c29c;
    classtype:command-and-control;
    sid:2025157; rev:2;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_12_20, deployment Perimeter, malware_family YesMaster, performance_impact Moderate, confidence High, signature_severity Major, updated_at 2020_08_24;
)