alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET POLICY Yandexbot Request Inbound"; flow:established,to_server; http.user_agent; content:"YandexBot"; startswith; classtype:policy-violation; sid:2013253; rev:5; metadata:attack_target Web_Server, created_at 2011_07_12, deployment Perimeter, confidence High, signature_severity Informational, tag WebCrawler, updated_at 2024_02_08, mitre_tactic_id TA0043, mitre_tactic_name Reconnaissance, mitre_technique_id T1593, mitre_technique_name Search_Open_Websites;)