alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE IMDDOS Botnet User-Agent i am ddos"; flow:established,to_server; content:"User-Agent|3A| i am ddos"; nocase; depth:300; reference:url,www.damballa.com/downloads/r_pubs/Damballa_Report_IMDDOS.pdf; classtype:trojan-activity; sid:2011484; rev:5; metadata:created_at 2010_09_29, confidence High, signature_severity Major, updated_at 2019_07_26;)