alert dns $HOME_NET any -> any any (msg:"ET INFO DYNAMIC_DNS Query to a Suspicious *.dnsalias.ru Domain"; dns.query; content:".dnsalias.ru"; fast_pattern; nocase; endswith; classtype:bad-unknown; sid:2022381; rev:9; metadata:attack_target Client_and_Server, created_at 2016_01_20, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, updated_at 2024_12_01, reviewed_at 2024_04_16, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1568, mitre_technique_name Dynamic_Resolution;)