alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET EXPLOIT VNC Server VNC Auth Offer"; flowbits:isset,BSis.vnc.setup; flow:established; dsize:20; content:"|00 00 00 02|"; depth:4; flowbits:noalert; flowbits:set,BSvnc.auth.offered; reference:url,www.realvnc.com/docs/rfbproto.pdf; classtype:misc-activity; sid:2002914; rev:6; metadata:created_at 2010_07_30, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)