alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET POLICY go-external-ip library User-Agent"; flow:established,to_server; http.user_agent; content:"go-external-ip (github.com/glendc/go-external-ip)"; threshold:type limit, track by_src, count 1, seconds 5; reference:md5,f33271282bc9aadadf2eff4bc0bad8a4; classtype:external-ip-check; sid:2030468; rev:1; metadata:attack_target Client_Endpoint, created_at 2020_07_03, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, updated_at 2020_07_03;)