alert udp $EXTERNAL_NET any -> $HOME_NET $SNMP_PORT (msg: "[CISCO-IOS] SNMP Authentication Failure [0/5]"; content: "SNMP-3-AUTHFAIL"; classtype: attempted-recon; flowbits: set, recon, 86400; parse_src_ip: 1; threshold: type limit, track by_src, count 5, seconds 300; reference: url,wiki.quadrantsec.com/bin/view/Main/5000051; sid: 5000051; rev:7;)

-- Main.Sagan-Wiki-Add - 2015-10-21

New revisions of 5000051 will be below...

alert any $EXTERNAL_NET any -> $HOME_NET any (msg: "[CISCO-IOS] SNMP Authentication Failure [0/5]"; content: "SNMP-3-AUTHFAIL"; default_proto: udp; default_dst_port: $SNMP_PORT; classtype: attempted-recon; xbits: set,recon,track ip_src,expire 86400; xbits: set,brute_force,track ip_src,expire 86400; parse_src_ip: 1; threshold: type suppress, track by_src, count 5, seconds 300; reference: url,wiki.quadrantsec.com/bin/view/Main/5000051; sid: 5000051; rev:11;)

-- Main.Sagan-Wiki-Add - 2021-4-12