alert http1 $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO StumbleUpon Submission Detected"; flow:established,to_server; http.header_names; content:"|0d 0a|X-SU-Version|0d 0a|"; threshold:type both, count 2, seconds 300, track by_src; classtype:policy-violation; sid:2013013; rev:6; metadata:created_at 2011_06_10, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_05_06;)