I rarely run a security audit on my servers. here's one:
root@hetzner2 ~ # grep -v cron /var/log/auth.log | grep Failed | awk '{print $11}' | sort | uniq -c473 116.255.183.148 1 122.141.251.42 153 122.225.109.118 166 122.225.109.195 247 122.225.109.211 197 122.225.109.216 287 122.225.109.219 279 122.225.109.220 78 122.225.109.98 4 193.104.41.10 1 209.239.114.179 208 211.72.184.100 6546 219.138.135.62 278 219.138.135.66 2 221.131.71.123 2391 222.186.34.119 12 27.254.33.142 8 61.152.108.18 113 61.174.51.194 240 61.174.51.199 449 61.174.51.207 230 61.174.51.219 271 61.174.51.222 5 61.234.104.167 2 a 8 abc123 381 admin 12 adrian 32 aion 29 alex 14 angel 16 anna 27 apache 9 asp 23 asterisk 9 asteriskpbx 14 ben 1 bwadmin 2 cmsftp 2 cpter1 13 cyrus 18 daniel 2 dasusr1 16 david 2 db2admin 2 db2fenc1 4 db2inst 19 db2inst1 12 debian 24 deploy 28 deployer 17 dev 2 devdata 34 developer 23 ec2-user 6 eric 26 ftp 14 ftp1 28 ftpuser 2 ftpuser1 1 george 6 getmail 2 gfep 59 git 1 gitlab 4 gitolite 1 gitorious 4 gitosis 3 gituser 1 gouveia1 1 gpadmin 3 guest 23 hadoop 2 haibis 14 hannes 1 hbistc 1 hduser 10 henny 3 hexiao 2 hmsftp 1 homes 16 hostmaster 2 hqq 2 hsm 17 hudson 3 icinga 1 ims 21 info 2 informix 15 ispconfig 2 jannik 22 jason 2 jbc 24 jboss 49 jenkins 35 jira 18 joomla 15 juan 11 kartel 14 kevin 1 kubota 1 laci 1 liangxiao 1 linux 1 lisendong 2 lshapps 2 lshora 1 machenglong 20 mailer 1 mantis 15 martin 1 mas 1 mc 50 minecraft 1 minidlna 1 mircte 1 mlog 1 mobilenetgames 1 mongodb 1 moni 9 moodle 1 mpos 1 mumble 1 muraki 2 mxque 5 mysql 4 mythtv 2 nag1os 40 nagios 1 nagios1 1 nagios2 1 nagios3 1 nagios5 1 nani 1 nexus 2 nginx 1 nicole 1 nitin 2 niuchao 17 noreply 16 no-reply 1 notice 1 openbraov 31 openbravo 1 openvpn 6 oprofile 31 oracle 1 oracle1 1 oracle11g 1 oracle2 1 orsap 1 orsapinf 23 otrs 3 patrol 13 pedro 1 pervuhina 3 pgsql 6 pi 2 portal 7 posp 28 postgres 1 praveen 1 public 1 qma 12 qtss 3 rashed 1 ravikanth 6 recruit 4 redis 35 redmine 1 report 1 resim 1 righa 11 rsync 2 rts 21 share 6 support 18 svn 62 teamspeak 41 teamspeak3 10 test 7 test1 2 test123 1 test1234 5 test2 6 test3 5 test4 6 testuser 14 tom 26 tomcat 11 tomcat5 13 tomcat6 11 tomcat7 2 trade 44 ts 38 ts3 2 ubnt 19 upload 25 usuario 5 usuario1 6 usuario2 2 web 25 webadmin 2 weblogic 2 webuser 24 wordpress 9 wp 20 www 12 wwwrun 8 xyz 39 zabbix
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