alert tcp $EXTERNAL_NET 1024: -> $HOME_NET 1023: (msg:"ET MALWARE Turkojan C&C nxt Command (nxt)"; flow:established,from_server; dsize:3; content:"nxt"; depth:3; classtype:command-and-control; sid:2008029; rev:4; metadata:created_at 2010_07_30, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)