alert http $HOME_NET any -> any any (msg:"ET POLICY Windows Update in Progress"; flow:established,to_server; http.user_agent; content:"Windows-Update-Agent"; threshold:type limit, count 1, seconds 300, track by_src; reference:url,windowsupdate.microsoft.com; classtype:policy-violation; sid:2002949; rev:10; metadata:created_at 2010_07_30, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_02_06;)