alert http $EXTERNAL_NET any -> $HOME_NET $HTTP_PORTS (msg:"ET SCAN Exabot Webcrawler User Agent"; flow:established,to_server; content:"Exabot"; nocase; http_user_agent; classtype:not-suspicious; sid:2033165; rev:2; metadata:attack_target Web_Server, created_at 2021_06_23, deployment Perimeter, confidence High, signature_severity Informational, tag WebCrawler, updated_at 2021_06_23, mitre_tactic_id TA0043, mitre_tactic_name Reconnaissance, mitre_technique_id T1593, mitre_technique_name Search_Open_Websites;)