alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"GPL POLICY VNC server response"; flow:established; content:"RFB 0"; depth:5; content:".0"; depth:2; offset:7; classtype:misc-activity; sid:2100560; rev:7; metadata:created_at 2010_09_23, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)