alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET USER_AGENTS Suspicious User-Agent (Windows 8)"; flow:to_server,established; http.user_agent; content:"Windows 8"; depth:9; threshold:type limit, count 1, seconds 600, track by_src; classtype:bad-unknown; sid:2026520; rev:3; metadata:affected_product Web_Browsers, attack_target Client_Endpoint, created_at 2018_10_18, deployment Perimeter, confidence High, signature_severity Minor, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_10_10;)