alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET HUNTING curl UA Querying External IP (geoplugin .net)"; flow:established,to_server; urilen:10; http.method; content:"GET"; http.uri; content:"/php.gp?ip"; fast_pattern; http.user_agent; content:"curl/"; startswith; nocase; http.host; content:"geoplugin.net"; endswith; reference:md5,d70405777ea19bb1e778ddffea8f8577; classtype:external-ip-check; sid:2049166; rev:1; metadata:attack_target Client_Endpoint, created_at 2023_11_13, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_11_13; target:src_ip;)