alert udp $EXTERNAL_NET any -> $HOME_NET 177 (msg:"GPL RPC xdmcp info query"; content:"|00 01 00 02 00 01 00|"; reference:nessus,10891; classtype:attempted-recon; sid:2101867; rev:2; metadata:created_at 2010_09_23, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)