alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET POLICY Norton Update User-Agent (Install Stub)"; flow:to_server,established; http.host; content:"stats.norton.com"; endswith; http.user_agent; content:"Install Stub"; depth:12; reference:url,threatexpert.com/reports.aspx?find=stats.norton.com; classtype:misc-activity; sid:2013882; rev:8; metadata:created_at 2011_11_08, deployment Perimeter, deployment alert_only, performance_impact Low, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_05_16;)