alert http $HOME_NET any -> $EXTERNAL_NET any (
msg:"ET POLICY Internal Host Retrieving External IP Address (monip.outils-rezo. info)";
flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:"/text";
http.host;
content:"monip.outils-rezo.info"; endswith; fast_pattern;
http.header_names;
content:!"Referer|0d 0a|";
classtype:external-ip-check;
sid:2024526; rev:3;
metadata:affected_product Any, attack_target Client_Endpoint, created_at 2017_08_08, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, updated_at 2020_08_11;
)