ET RETIRED TA453 BellaCiao ASPX Backdoor User-Agent in HTTP Request

alert http any any -> $HOME_NET any (
    msg:"ET RETIRED TA453 BellaCiao ASPX Backdoor User-Agent in HTTP Request";
    flow:established,to_server;
    flowbits:set,ET.BellaCiao.UA;
    http.uri;
    content:".aspx"; endswith;
    http.user_agent;
    content:"ruby|40|123|21|"; startswith; fast_pattern;
    threshold:type limit, track by_src, count 1, seconds 180;
    reference:url,www.bitdefender.com/blog/businessinsights/unpacking-bellaciao-a-closer-look-at-irans-latest-malware/;
    classtype:trojan-activity;
    sid:2045224; rev:3;
    metadata:affected_product Microsoft_IIS, attack_target Web_Server, created_at 2023_04_27, deployment Perimeter, deployment Internal, deployment SSLDecrypt, former_category MALWARE, malware_family TA453, malware_family BellaCiao, performance_impact Low, confidence High, signature_severity Major, updated_at 2025_04_17, reviewed_at 2025_04_17;
    target:dest_ip;
)