alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO Observed Dynamic DNS Domain ( .afshin .ir) in TLS SNI"; flow:established,to_server; tls.sni; dotprefix; content:"..afshin.ir"; endswith; fast_pattern; reference:url,freedns.afraid.org/domain/registry/page-10.html; classtype:misc-activity; sid:2053714; rev:1; metadata:affected_product Any, affected_product IoT, attack_target Client_Endpoint, created_at 2024_06_18, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, updated_at 2024_06_18;)