ET MALWARE Win32/Backdoor.Randrew.A CnC Checkin

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Win32/Backdoor.Randrew.A CnC Checkin";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:".aspx?A="; fast_pattern;
    pcre:"/^[A-Z0-9\-]{30,42}$/R";
    http.header;
    content:"Accept-Language|3a 20|zh-TW";
    http.header_names;
    content:"Referer|0d 0a|";
    content:!"Cache";
    reference:md5,344c04216840312cad17b6610b723825;
    classtype:command-and-control;
    sid:2025145; rev:3;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_12_11, deployment Perimeter, malware_family Randrew_A, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_12_18;
)