From just one of our server logs. This Documentation inspired me to turn off SSH access to all our servers. A snap shot of what we saw:
11/19/11 3:09:24 AM sshd[91041] error: PAM: authentication error for illegal user barry from 188.134.13.44 via 192.168.80.4
11/19/11 3:09:54 AM sshd[91076] error: PAM: authentication error for illegal user bart from 62.183.105.164 via 192.168.80.4
11/19/11 3:10:28 AM sshd[91184] error: PAM: authentication error for illegal user bartek from 211.144.82.8 via 192.168.80.4
11/19/11 3:14:34 AM sshd[91288] error: PAM: authentication error for illegal user bash from mx.cashcredito.com.br via 192.168.80.4
11/19/11 3:14:59 AM sshd[91331] error: PAM: authentication error for illegal user bash from 61-221-28-243.hinet-ip.hinet.net via 192.168.80.4
11/19/11 3:16:00 AM sshd[91583] error: PAM: authentication error for illegal user bash from 211.147.221.42 via 192.168.80.4
11/19/11 3:16:24 AM sshd[91652] error: PAM: authentication error for illegal user bashir from plahpoy1.plahpoy.com via 192.168.80.4
11/19/11 3:17:43 AM sshd[91742] error: PAM: authentication error for illegal user basil from 60-240-231-246.static.tpgi.com.au via 192.168.80.4
11/19/11 3:19:03 AM sshd[91797] error: PAM: authentication error for illegal user basket from 90.182.52.58 via 192.168.80.4
11/19/11 3:21:23 AM sshd[91951] error: PAM: authentication error for illegal user basura from 122.70.141.250 via 192.168.80.4
11/19/11 3:21:54 AM sshd[91983] error: PAM: authentication error for illegal user bat from 1901424851.ip33.static.mediacommerce.com.co via 192.168.80.4
11/19/11 3:42:52 AM sshd[92817] error: PAM: authentication error for illegal user bedelia from 118.97.50.11 via 192.168.80.4
11/19/11 3:44:24 AM sshd[92854] error: PAM: authentication error for illegal user beep from intranet.compraspublicas.gov.ec via 192.168.80.4
11/19/11 3:46:59 AM sshd[92938] error: PAM: authentication error for illegal user bego from jblc2.utm.my via 192.168.80.4
11/19/11 3:48:07 AM sshd[92990] error: PAM: authentication error for illegal user bei from 124.193.142.249 via 192.168.80.4
11/19/11 3:48:11 AM sshd[92982] error: PAM: authentication error for illegal user behroozin from 61.59.101.16 via 192.168.80.4
11/19/11 3:52:15 AM sshd[93194] error: PAM: authentication error for illegal user bella from 122.227.129.113 via 192.168.80.4
11/19/11 4:00:35 AM sshd[93482] error: PAM: authentication error for illegal user benites from 60.28.199.166 via 192.168.80.4
11/19/11 4:01:55 AM sshd[93531] error: PAM: authentication error for illegal user benjamin from 194.2.25.13 via 192.168.80.4
11/19/11 4:04:52 AM sshd[93616] error: PAM: authentication error for illegal user benson from 202.109.129.166 via 192.168.80.4
11/19/11 4:07:47 AM sshd[93692] error: PAM: authentication error for illegal user beothy from sop06-1-82-228-250-163.fbx.proxad.net via 192.168.80.4
11/19/11 5:51:28 AM sshd[97879] error: PAM: authentication error for illegal user body from 124.193.142.249 via 192.168.80.4
11/19/11 5:52:53 AM sshd[97929] error: PAM: authentication error for illegal user bogart from 209.88.156.132 via 192.168.80.4
11/19/11 5:54:00 AM sshd[97973] error: PAM: authentication error for illegal user bogdan from 61.78.62.43 via 192.168.80.4
11/19/11 5:57:06 AM sshd[98058] error: PAM: authentication error for illegal user bom from 190.254.11.218 via 192.168.80.4
11/19/11 5:58:48 AM sshd[98109] error: PAM: authentication error for illegal user boni from 61.164.36.4 via 192.168.80.4
11/19/11 6:01:21 AM sshd[98261] error: PAM: authentication error for illegal user boo from 69.162.119.162 via 192.168.80.4
11/19/11 6:04:27 AM sshd[98347] error: PAM: authentication error for illegal user boot from 211.144.82.8 via 192.168.80.4
11/19/11 6:04:54 AM sshd[98377] error: PAM: authentication error for illegal user bootcamp from 85.132.139.26 via 192.168.80.4
11/19/11 6:06:14 AM sshd[98423] error: PAM: authentication error for illegal user borey from host152-167-static.4-79-b.business.telecomitalia.it via 192.168.80.4
11/19/11 6:07:29 AM sshd[98461] error: PAM: authentication error for illegal user boris from mailserver.trascopier.com.ar via 192.168.80.4
11/19/11 6:09:58 AM sshd[98541] error: PAM: authentication error for illegal user boru from host-87-255-2-22.kurkino.net.ru via 192.168.80.4
11/19/11 6:22:04 AM sshd[99083] error: PAM: authentication error for illegal user brad from 122.255.96.164 via 192.168.80.4
11/19/11 6:24:05 AM sshd[99148] error: PAM: authentication error for illegal user bradley from 122.255.96.164 via 192.168.80.4
11/19/11 6:26:07 AM sshd[99202] error: PAM: authentication error for illegal user bradyn from balticom-1-115.balticom.lv via 192.168.80.4
11/19/11 6:26:37 AM sshd[99221] error: PAM: authentication error for illegal user braedon from 85.132.139.26 via 192.168.80.4
11/19/11 6:29:32 AM sshd[99309] error: PAM: authentication error for illegal user bram from 61-221-28-243.hinet-ip.hinet.net via 192.168.80.4
11/19/11 6:35:01 AM sshd[99588] error: PAM: authentication error for illegal user brandie from gtm146.internetdsl.tpnet.pl via 192.168.80.4
11/19/11 6:35:48 AM sshd[99629] error: PAM: authentication error for illegal user brands from 219.240.36.110 via 192.168.80.4
11/19/11 6:38:01 AM sshd[99687] error: PAM: authentication error for illegal user brayden from esd701.easyserver.net via 192.168.80.4
11/19/11 6:42:24 AM sshd[99886] error: PAM: authentication error for illegal user breandan from host-87-255-2-22.kurkino.net.ru via 192.168.80.4
11/19/11 6:43:14 AM sshd[99924] error: PAM: authentication error for illegal user breanna from 62.225.155.90 via 192.168.80.4
11/19/11 6:44:00 AM sshd[99962] error: PAM: authentication error for illegal user breck from 58.254.143.204 via 192.168.80.4
11/19/11 6:44:25 AM sshd[99979] error: PAM: authentication error for illegal user breck from www.iitkgp.ac.in via 192.168.80.4
11/19/11 6:48:30 AM sshd[226] error: PAM: authentication error for illegal user brend from 85-10-204-194.clients.your-server.de via 192.168.80.4
11/19/11 7:29:35 AM sshd[1949] error: PAM: authentication error for illegal user bronson from host-87-255-2-22.kurkino.net.ru via 192.168.80.4
11/19/11 7:30:36 AM sshd[2082] error: PAM: authentication error for illegal user bronwyn from 219.139.45.120 via 192.168.80.4
11/19/11 7:32:36 AM sshd[2138] error: PAM: authentication error for illegal user brooks from 69.162.70.2 via 192.168.80.4
11/19/11 7:36:10 AM sshd[2249] error: PAM: authentication error for illegal user bruce from 211.167.110.2 via 192.168.80.4
11/19/11 7:38:18 AM sshd[2306] error: PAM: authentication error for illegal user bruna from mailserver.trascopier.com.ar via 192.168.80.4
11/19/11 7:38:49 AM sshd[2343] error: PAM: authentication error for illegal user brunhilda from 219.240.36.108 via 192.168.80.4
11/19/11 7:40:52 AM sshd[2489] error: PAM: authentication error for illegal user bruno2 from mail.aegislab.com via 192.168.80.4
11/19/11 7:41:50 AM sshd[2536] error: PAM: authentication error for illegal user brunos from 209.88.156.132 via 192.168.80.4
11/19/11 7:54:05 AM sshd[2953] error: PAM: authentication error for illegal user bueno from 209.88.156.132 via 192.168.80.4
11/19/11 7:55:50 AM sshd[3009] error: PAM: authentication error for illegal user buffi from vegawlan.pl via 192.168.80.4
11/19/11 7:56:09 AM sshd[3026] error: PAM: authentication error for illegal user buffy from 201.134.39.146 via 192.168.80.4
11/19/11 7:56:41 AM sshd[3045] error: PAM: authentication error for illegal user bufor from 190.254.11.218 via 192.168.80.4
11/19/11 7:58:14 AM sshd[3110] error: PAM: authentication error for illegal user bugs from 124.193.142.249 via 192.168.80.4
11/19/11 7:59:34 AM sshd[3148] error: PAM: authentication error for illegal user buia from 219.139.45.120 via 192.168.80.4
11/19/11 8:04:06 AM sshd[3369] error: PAM: authentication error for illegal user bunic from vegawlan.pl via 192.168.80.4
11/19/11 8:10:49 AM sshd[3625] error: PAM: authentication error for illegal user buttermilk from moscovita.curimbaba.com.br via
11/19/11 8:12:19 AM sshd[3676] error: PAM: authentication error for illegal user buy from 222.73.41.52 via 192.168.80.4
11/19/11 8:12:54 AM sshd[3706] error: PAM: authentication error for illegal user buz from 209.88.156.132 via 192.168.80.4
11/19/11 8:13:41 AM sshd[3740] error: PAM: authentication error for illegal user buze from vegawlan.pl via 192.168.80.4
11/19/11 8:14:23 AM sshd[3767] error: PAM: authentication error for illegal user buzonas from mail.aegislab.com via 192.168.80.4
11/19/11 8:15:22 AM sshd[3814] error: PAM: authentication error for illegal user buzyn from plahpoy1.plahpoy.com via 192.168.80.4
11/19/11 8:20:35 AM sshd[4028] error: PAM: authentication error for illegal user bvworks from ejf01.ejf.hu via 192.168.80.4
11/19/11 8:21:08 AM sshd[4069] error: PAM: authentication error for illegal user byard from 62.161.44.45 via 192.168.80.4
11/19/11 8:22:34 AM sshd[4105] error: PAM: authentication error for illegal user byce from 59.108.108.100 via 192.168.80.4
11/19/11 8:23:33 AM sshd[4143] error: PAM: authentication error for illegal user byczek from 221.224.13.25 via 192.168.80.4
11/19/11 8:28:51 AM sshd[4289] error: PAM: authentication error for illegal user byfield from ns2.inetsouth.com via 192.168.80.4
11/19/11 8:29:51 AM sshd[4330] error: PAM: authentication error for illegal user byfuglien from 201.134.39.146 via 192.168.80.4
11/19/11 8:36:12 AM sshd[4576] error: PAM: authentication error for illegal user bylina from 189.14.99.226 via 192.168.80.4
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