alert dns $HOME_NET any -> any any (msg:"ET POLICY External IP Address Lookup (bei .kr)"; dns.query; content:"bei.kr"; nocase; bsize:6; reference:md5,4be96f71944c22990a686e280107dc06; classtype:external-ip-check; sid:2037875; rev:1; metadata:attack_target Client_and_Server, created_at 2022_08_01, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, updated_at 2022_08_01, reviewed_at 2025_07_14;)