alert udp $EXTERNAL_NET any -> $HOME_NET 161 (msg:"ET SNMP missing community string attempt 3"; content:"|30|"; depth:1; byte_test:1,&,0x80,0,relative,big; byte_jump:1,0,relative; content:"|02|"; distance:-129; within:1; byte_test:1,!&,0x80,0,relative,big; byte_jump:1,0,relative; content:"|04 00|"; within:2; reference:bugtraq,2112; reference:cve,1999-0517; classtype:misc-attack; sid:2016180; rev:3; metadata:created_at 2013_01_09, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)