alert http $EXTERNAL_NET any -> $HTTP_SERVERS any (msg:"ET WEB_SERVER PHP Crawler"; flow:established,to_server; threshold:type limit, track by_src, count 1, seconds 300; http.user_agent; content:"PHPCrawl"; depth:8; reference:url,phpcrawl.cuab.de/; classtype:attempted-user; sid:2018607; rev:3; metadata:created_at 2014_06_26, signature_severity Minor, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_04_30;)