alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Likely Bot Nick in IRC (USA +..)"; flow:established,to_server; content:"NICK "; depth:5; content:"USA"; within:10; classtype:trojan-activity; sid:2008124; rev:5; metadata:created_at 2010_07_30, confidence Medium, signature_severity Major, updated_at 2019_07_26;)