alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO DYNAMIC_DNS HTTP Request to a *.dyndns-*.com domain"; flow:established,to_server; content:".dyndns-"; http_header; nocase; pcre:"/\.dyndns-(?=(at-home|at-work|blog|free|home|ip|mail|office|pics|remote|server|web|wiki|work))\.com\x0d\x0a/iH"; classtype:bad-unknown; sid:2012928; rev:11; metadata:attack_target Client_and_Server, created_at 2011_06_03, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, updated_at 2024_12_01, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1568, mitre_technique_name Dynamic_Resolution;)