alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET ADWARE_PUP W32/OpenTrio User-Agent (Open3)"; flow:established,to_server; http.user_agent; content:"Open3"; startswith; classtype:pup-activity; sid:2014190; rev:4; metadata:created_at 2012_02_06, confidence High, signature_severity Minor, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_08_31;)