alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"ET EXPLOIT VNC Client response"; flowbits:isset,BSposs.vuln.vnc.svr; flow:established; dsize:12; content:"RFB 003.0"; depth:9; flowbits:noalert; flowbits:set,BSis.vnc.setup; reference:url,www.realvnc.com/docs/rfbproto.pdf; classtype:misc-activity; sid:2002913; rev:7; metadata:created_at 2010_07_30, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)