Rule History

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET DOS User-Agent used in known DDoS Attacks Detected outbound 2"; flow:established,to_server; http.user_agent; content:"Opera/9.02 (Windows NT 5.1|3b 20|U|3b 20|ru)"; reference:url,www.linuxquestions.org/questions/linux-security-4/massive-ddos-need-advice-help-795298/; classtype:denial-of-service; sid:2011823; rev:4; metadata:created_at 2010_10_18, confidence High, signature_severity Major, updated_at 2020_05_06;)