alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET EXPLOIT VNC Multiple Authentication Failures"; flowbits:isset,BSvnc.auth.agreed; flow:established; dsize:<50; content:"|00 00 00 02|"; depth:4; reference:url,www.realvnc.com/docs/rfbproto.pdf; classtype:attempted-admin; sid:2002921; rev:6; metadata:created_at 2010_07_30, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)