alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET INFO BitNinja IO Security Check"; flow:established,to_client; http.stat_code; content:"403"; http.header; content:"BitNinja Captcha Server"; fast_pattern; file.data; content:"<title>Waiting for the redirectiron..."; classtype:misc-activity; sid:2030694; rev:2; metadata:affected_product Web_Browsers, attack_target Client_Endpoint, created_at 2020_08_17, deployment Perimeter, confidence High, signature_severity Informational, updated_at 2020_08_17;)