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Rev: 5 • Jul 30, 2010, 12:00 PMET POLICY Unusual number of DNS No Such Name Responses
alert udp any 53 -> ![$DNS_SERVERS,$SMTP_SERVERS] any (msg:"ET POLICY Unusual number of DNS No Such Name Responses"; content:"|83|"; offset:3; depth:1; threshold:type both , track by_dst, count 50, seconds 300; classtype:bad-unknown; sid:2003195; rev:5; metadata:created_at 2010_07_30, confidence High, signature_severity Informational, updated_at 2019_07_26;)
Jul 30, 2010, 12:00 PM
Jul 26, 2019, 12:00 PM
Sep 21, 2024, 3:00 AM
May 30, 2025, 12:04 AM
rules/emerging-policy.rules