ET MALWARE MirrorBlast KiXtart Downloader Server Response

alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET MALWARE MirrorBlast KiXtart Downloader Server Response";
    flow:established,to_client;
    http.stat_code;
    content:"200";
    http.header;
    content:"Content-Disposition|3a 20|attachment|3b 20|filename=";
    content:".rb|0d 0a|"; within:32;
    http.cookie;
    content:"XSRF-TOKEN=eyJpdiI6I";
    pcre:"/(?:I(?:iwidmFsdWUiO|sInZhbHVlIjo)i|iLCJ2YWx1ZSI6I)/R";
    content:"load_session=eyJpdiI6I"; fast_pattern;
    pcre:"/(?:I(?:iwidmFsdWUiO|sInZhbHVlIjo)i|iLCJ2YWx1ZSI6I)/R";
    classtype:command-and-control;
    sid:2034110; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_10_04, deployment Perimeter, performance_impact Moderate, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_10_04;
)