alert tcp $EXTERNAL_NET 1024:65535 -> $HOME_NET any (msg:"ET MALWARE Delfsnif/Buzus.fte Remote Response"; flow:established,from_server; dsize:9; content:"|05 00 00 00|"; depth:4; content:"|cd|"; distance:4; within:1; reference:url,www.threatexpert.com/threats/virtool-win32-delfsnif-gen.html; classtype:trojan-activity; sid:2009079; rev:3; metadata:created_at 2010_07_30, signature_severity Major, updated_at 2019_07_26;)