alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET USER_AGENTS User-Agent (Internet Explorer)"; flow:established,to_server; http.user_agent; content:"Internet Explorer"; depth:17; endswith; nocase; http.host; content:!"pnrws.skype.com"; content:!"iecvlist.microsoft.com"; content:!".lenovo.com"; classtype:bad-unknown; sid:2008052; rev:20; metadata:created_at 2010_07_30, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_10_05;)