alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET ADWARE_PUP User-Agent (Explorer)"; flow:established,to_server; http.user_agent; content:"Explorer"; depth:8; endswith; classtype:pup-activity; sid:2007921; rev:12; metadata:created_at 2010_07_30, confidence High, signature_severity Minor, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_09_17;)