ET HUNTING Byte-order mark UTF-32BE (big endian)

alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET HUNTING Byte-order mark UTF-32BE (big endian)";
    flow:established,to_client;
    flowbits:set,ET.BOM.utf32be;
    flowbits:noalert;
    http.response_body;
    content:"|00 00 fe ff|"; startswith;
    reference:url,learn.microsoft.com/en-us/windows/win32/intl/using-byte-order-marks;
    reference:url,isc.sans.edu/diary/31204;
    classtype:misc-activity;
    sid:2055648; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2024_08_30, deployment Perimeter, deployment SSLDecrypt, confidence High, signature_severity Informational, updated_at 2024_08_30;
    target:dest_ip;
)