alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Hupigon User Agent Detected (RAV1.23)"; flow:established,to_server; http.user_agent; content:"RAV"; nocase; depth:3; pcre:"/^RAV\d\.\d\d/"; classtype:trojan-activity; sid:2007661; rev:8; metadata:created_at 2010_07_30, confidence High, signature_severity Major, updated_at 2020_09_04;)