alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET POLICY Google Desktop User-Agent Detected"; flow:to_server,established; threshold:type limit, count 1, seconds 360, track by_src; http.user_agent; content:"(compatible|3b| Google Desktop)"; fast_pattern; nocase; reference:url,news.com.com/2100-1032_3-6038197.html; classtype:policy-violation; sid:2002801; rev:15; metadata:created_at 2010_07_30, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_04_27;)