alert tcp $EXTERNAL_NET any -> $HOME_NET $HTTP_PORTS (msg:"ET POLICY Msnbot Crawl"; flow:established,to_server; http.user_agent; content:"msnbot"; nocase; threshold:type both, track by_src, count 10, seconds 60; reference:url,search.msn.com/msnbot.htm; classtype:attempted-recon; sid:2002831; rev:10; metadata:created_at 2010_07_30, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_02_19;)