alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET USER_AGENTS Observed Suspicious UA (\xa4)"; flow:established,to_server; http.header; content:"|0d 0a|User-Agent|3a 20 a4 0d 0a|"; fast_pattern; http.user_agent; content:"|a4|"; bsize:1; classtype:bad-unknown; sid:2029554; rev:2; metadata:affected_product Any, attack_target Client_Endpoint, created_at 2020_03_02, deployment Perimeter, confidence High, signature_severity Minor, updated_at 2024_03_08;)