alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Bifrose Connect to Controller"; flow:established,to_server; dsize:<20; content:"|09 00 00 9a|"; depth:4; content:"|cc|"; distance:3; within:4; content:"|74|"; distance:3; within:4; classtype:trojan-activity; sid:2008273; rev:4; metadata:created_at 2010_07_30, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)