alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO External IP Address Lookup - myip.ch"; flow:established,to_server; urilen:1; http.method; content:"GET"; http.host; content:"myip.ch"; endswith; fast_pattern; classtype:external-ip-check; sid:2044453; rev:4; metadata:affected_product Any, attack_target Client_Endpoint, created_at 2016_11_22, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, updated_at 2023_03_07, former_sid 2823420;)