alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Psyb0t joining an IRC Channel"; flow:established,to_server; flowbits:isset,is_proto_irc; content:"JOIN #mipsel"; reference:url,www.adam.com.au/bogaurd/PSYB0T.pdf; classtype:trojan-activity; sid:2009172; rev:2; metadata:created_at 2010_07_30, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)