Detection Logic
alert any $EXTERNAL_NET any -> $HOME_NET any (msg: "[BIND] Zone transfer error"; pcre: "/^zone \S+: expired/"; default_proto: udp; default_dst_port: $DNS_PORT; classtype: configuration-error; program: named; parse_port; parse_src_ip: 1; sid:5000110; rev: 6;)Field Validations
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