alert udp $EXTERNAL_NET any -> $HOME_NET any (msg:"GPL RPC ypserv maplist request UDP"; content:"|00 01 86 A4|"; depth:4; offset:12; content:"|00 00 00 0B|"; within:4; distance:4; content:"|00 00 00 00|"; depth:4; offset:4; reference:bugtraq,5914; reference:bugtraq,6016; reference:cve,2002-1232; classtype:rpc-portmap-decode; sid:2102033; rev:9; metadata:created_at 2010_09_23, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)