alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET USER_AGENTS Suspicious User-Agent (Windows XP)"; flow:established,to_server; http.user_agent; content:"Windows XP"; startswith; classtype:bad-unknown; sid:2026519; rev:4; 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 2024_04_13;)