alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO External IP Check (checkip .amazonaws .com)"; flow:established,to_server; urilen:1; http.host; content:"checkip.amazonaws.com"; fast_pattern; reference:md5,966301e88d8a43abe1215413bfd48b09; classtype:external-ip-check; sid:2052027; rev:6; metadata:attack_target Client_Endpoint, created_at 2015_11_06, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_15, reviewed_at 2024_04_15, former_sid 2814787; target:src_ip;)