ET MALWARE Matanbuchus Loader Server Response

alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET MALWARE Matanbuchus Loader Server Response";
    flow:established,to_client;
    http.stat_code;
    content:"200";
    http.content_len;
    byte_test:0,<,100,0,string,dec;
    http.response_body;
    content:"eyJoc3pBIjoi"; startswith; fast_pattern;
    pcre:"/(?:ifQ==|In0=|J9)$/";
    threshold:type limit, track by_src, count 1, seconds 120;
    reference:url,twitter.com/fr0s7_/status/1458823504925798408;
    classtype:command-and-control;
    sid:2034470; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2021_11_16, deployment Perimeter, malware_family Matanbuchus, confidence High, signature_severity Major, updated_at 2021_11_16, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
)