alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET USER_AGENTS Observed Suspicious UA (Client)"; flow:established,to_server; http.user_agent; bsize:6; content:"Client"; http.header; header_lowercase; content:"user-agent|3a 20|Client|0d 0a|"; fast_pattern; classtype:bad-unknown; sid:2028912; rev:4; metadata:affected_product Any, attack_target Client_Endpoint, created_at 2019_10_28, deployment Perimeter, confidence High, signature_severity Informational, updated_at 2024_04_29;)