alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO Possible IP Check curlmyip.com"; flow:established,to_server; http.method; content:"GET"; http.host; content:"curlmyip.com"; reference:url,blogs.cisco.com/security/talos/cryptowall-2; classtype:external-ip-check; sid:2020106; rev:6; metadata:created_at 2015_01_07, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, confidence Medium, signature_severity Informational, updated_at 2023_05_23, reviewed_at 2024_03_26;)