alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE IMDDOS Botnet User-Agent kav"; flow:established,to_server; http.user_agent; content:"kav"; startswith; reference:url,www.damballa.com/downloads/r_pubs/Damballa_Report_IMDDOS.pdf; classtype:trojan-activity; sid:2011482; rev:7; metadata:created_at 2010_09_29, confidence High, signature_severity Major, updated_at 2020_08_13;)