alert dns $HOME_NET any -> any any (msg:"ET INFO DYNAMIC_DNS Query to a *.land-4-sale .us Domain"; dns.query; content:".land-4-sale.us"; fast_pattern; nocase; endswith; reference:url,help.dyn.com/list-of-dyn-dns-pro-remote-access-domain-names/; classtype:bad-unknown; sid:2042124; rev:2; metadata:attack_target Client_and_Server, created_at 2022_12_07, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, updated_at 2023_03_02, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1568, mitre_technique_name Dynamic_Resolution;)