alert tcp $EXTERNAL_NET any -> $HOME_NET $HTTP_PORTS (msg:"ET WEB_SPECIFIC_APPS phpBB3 registration (Step1 GET)"; flow:to_server,established; content:"GET "; depth:4; nocase; content:"/ucp.php"; http_uri; nocase; content:"mode=register"; http_uri; flowbits:set,ET.phpBB3_test; flowbits:set,ET.phpBB3_register_stage1; flowbits:noalert; classtype:attempted-user; sid:2010890; rev:3; metadata:created_at 2010_07_30, signature_severity Major, updated_at 2019_08_22;)