alert tcp $EXTERNAL_NET 1024: -> $HOME_NET any (msg:"ET DELETED Unknown Keepalive in"; flow:established,to_client; dsize:5; content:"|17 24 1B 00 00|"; flowbits:isnotset,ET.teamviewerkeepaliveout; flowbits:isset,ET.unknownkeepaliveup; classtype:unknown; sid:2008780; rev:4; metadata:created_at 2010_07_30, signature_severity Unknown, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)