alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET USER_AGENTS Microsoft Dr Watson User-Agent (MSDW)"; flow:established,to_server; http.user_agent; content:"MSDW"; depth:4; isdataat:!1,relative; fast_pattern; threshold:type limit, track by_src, count 1, seconds 300; classtype:unknown; sid:2027389; rev:4; metadata:affected_product Web_Browsers, attack_target Client_Endpoint, created_at 2019_05_28, deployment Perimeter, performance_impact Low, confidence High, signature_severity Minor, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_10_16;)