alert http1 $HOME_NET any -> $EXTERNAL_NET any (msg:"ET ADWARE_PUP ZenoSearch Spyware User-Agent"; flow:established,to_server; http.header; content:"User-Agent|3a 20|["; fast_pattern; http.user_agent; pcre:"/^\[.*\][A-F0-9]{2}-[A-F0-9]{2}-[A-F0-9]{2}/i"; classtype:pup-activity; sid:2008279; rev:16; metadata:attack_target Client_Endpoint, created_at 2010_07_30, deployment Perimeter, confidence High, signature_severity Minor, tag Spyware_User_Agent, updated_at 2024_05_07;)