alert syslog $EXTERNAL_NET any -> $HOME_NET any (msg: "[WINDOWS-AUTH] Windows DC Logon Failure - Brute force 0x6 - Client not found in Kerberos database [25/1]"; pcre: "/ 675: | 676: | 681: | 4771: | 4768: /"; content: " 0x6 Client "; classtype: unsuccessful-user; program: Security*; flowbits: set,brute_force,86400; after: track by_src, count 25, seconds 300; threshold: type limit, track by_src, count 1, seconds 86400; parse_src_ip: 1; reference: url,wiki.quadrantsec.com/bin/view/Main/5001745; sid: 5001745; rev:5;)

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

New revisions of 5001745 will be below...

alert syslog $EXTERNAL_NET any -> $HOME_NET any (msg: "[WINDOWS-AUTH] Windows DC Logon Failure - Brute force 0x6 - Client not found in Kerberos database [25/1]"; pcre: "/ 675: | 676: | 681: | 4771: | 4768: /"; content: " 0x6 Client "; classtype: unsuccessful-user; program: Security; flowbits: set,brute_force,21600; after: track by_src, count 25, seconds 300; threshold: type limit, track by_src, count 1, seconds 86400; parse_src_ip: 1; reference: url,wiki.quadrantsec.com/bin/view/Main/5001745; sid: 5001745; rev:7;)

-- Main.Sagan-Wiki-Add - 2016-8-30

alert any $EXTERNAL_NET any -> $HOME_NET any (msg: "[WINDOWS-AUTH] Windows DC Logon Failure - Brute force 0x6 - Client not found in Kerberos database [25/1]"; event_id: 4768,4771,681,676,675; content: " 0x6 Client "; classtype: brute-force; program: Security; xbits: set,brute_force,track ip_src, expire 21600; after: track by_src, count 25, seconds 300; threshold: type suppress, track by_src, count 1, seconds 86400; parse_src_ip: 1; reference: url,wiki.quadrantsec.com/bin/view/Main/5001745; sid: 5001745; rev:12;)

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