alert tcp $EXTERNAL_NET 5938 -> $HOME_NET any (msg:"ET POLICY TeamViewer Keep-alive inbound"; flow:established,to_client; dsize:5; content:"|17 24 1B 00 00|"; flowbits:isset,ET.teamviewerkeepaliveout; threshold:type limit, count 1, seconds 120, track by_src; reference:url,www.teamviewer.com; reference:url,en.wikipedia.org/wiki/TeamViewer; classtype:misc-activity; sid:2008795; rev:4; metadata:created_at 2010_07_30, signature_severity Unknown, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)