alert tcp $HOME_NET any -> $EXTERNAL_NET 1024: (msg:"ET DELETED Unknown Keepalive out"; flow:established,to_server; dsize:5; content:"|17 24 1B 00 00|"; flowbits:isnotset,ET.teamviewerkeepaliveout; flowbits:set,ET.unknownkeepaliveup; flowbits:noalert; classtype:unknown; sid:2008779; rev:4; metadata:created_at 2010_07_30, signature_severity Unknown, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)