alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET SCAN Internet Scanning Project HTTP scan"; flow:established,to_server; http.user_agent; content:"research-scanner/"; startswith; http.host; content:"internetscanningproject.org"; reference:url,www.internetscanningproject.org; classtype:attempted-recon; sid:2018782; rev:3; metadata:created_at 2014_07_25, confidence Medium, signature_severity Informational, updated_at 2020_05_01;)