alert http $EXTERNAL_NET any -> $HTTP_SERVERS any (msg:"ET SCAN Open-Proxy ScannerBot (webcollage-UA)"; flow:established,to_server; http.user_agent; content:"webcollage/"; depth:11; nocase; reference:url,stateofsecurity.com/?p=526; reference:url,www.botsvsbrowsers.com/details/214715/index.html; classtype:bad-unknown; sid:2010768; rev:8; metadata:created_at 2010_07_30, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_10_19;)