Someone tried to log into my server

Someone from IP 88.191.116.104 (Evicom.Net) tried to log into my server using ssh brute force or dictionary attack technique this morning.

This ip has been blacklisted as published in http://danger.rulez.sk/projects/bruteforceblocker/blist.php

Here’s the display of my realtime log when attacker worked:

Dec 17 09:02:39 mail sshd[14018]: Invalid user web from 88.191.116.104
Dec 17 09:02:42 mail sshd[14020]: Invalid user web from 88.191.116.104
Dec 17 09:02:45 mail sshd[14025]: Invalid user web from 88.191.116.104
Dec 17 09:02:48 mail sshd[14027]: Invalid user web from 88.191.116.104
Dec 17 09:02:51 mail sshd[14034]: Invalid user web from 88.191.116.104
Dec 17 09:02:53 mail sshd[14037]: Invalid user web from 88.191.116.104
Dec 17 09:02:57 mail sshd[14039]: Invalid user web from 88.191.116.104
Dec 17 09:03:00 mail sshd[14041]: Invalid user web from 88.191.116.104
Dec 17 09:03:02 mail sshd[14043]: Invalid user web from 88.191.116.104
Dec 17 09:03:05 mail sshd[14049]: Invalid user web from 88.191.116.104
Dec 17 09:03:08 mail sshd[14051]: Invalid user web from 88.191.116.104
Dec 17 09:03:11 mail sshd[14053]: Invalid user web from 88.191.116.104
Dec 17 09:03:14 mail sshd[14059]: Invalid user web from 88.191.116.104
Dec 17 09:03:17 mail sshd[14179]: Invalid user web from 88.191.116.104
Dec 17 09:03:20 mail sshd[14254]: Invalid user web from 88.191.116.104
Dec 17 09:03:23 mail sshd[14256]: Invalid user web from 88.191.116.104
Dec 17 09:03:25 mail sshd[14258]: Invalid user web from 88.191.116.104
Dec 17 09:03:28 mail sshd[14260]: Invalid user web from 88.191.116.104
Dec 17 09:03:31 mail sshd[14262]: Invalid user web from 88.191.116.104
Dec 17 09:03:34 mail sshd[14268]: Invalid user web from 88.191.116.104
Dec 17 09:03:37 mail sshd[14270]: Invalid user web from 88.191.116.104
Dec 17 09:03:40 mail sshd[14272]: Invalid user web from 88.191.116.104
Dec 17 09:03:43 mail sshd[14274]: Invalid user web from 88.191.116.104
Dec 17 09:03:46 mail sshd[14279]: Invalid user user from 88.191.116.104
Dec 17 09:03:49 mail sshd[14282]: Invalid user user from 88.191.116.104
Dec 17 09:03:52 mail sshd[14284]: Invalid user user from 88.191.116.104
Dec 17 09:03:54 mail sshd[14291]: Invalid user user from 88.191.116.104
Dec 17 09:03:57 mail sshd[14293]: Invalid user user from 88.191.116.104
Dec 17 09:04:00 mail sshd[14296]: Invalid user user from 88.191.116.104
Dec 17 09:04:03 mail sshd[14311]: Invalid user user from 88.191.116.104
Dec 17 09:04:06 mail sshd[14435]: Invalid user user from 88.191.116.104
Dec 17 09:04:09 mail sshd[14483]: Invalid user user from 88.191.116.104
Dec 17 09:04:12 mail sshd[14626]: Invalid user user from 88.191.116.104
Dec 17 09:04:15 mail sshd[14632]: Invalid user user from 88.191.116.104
Dec 17 09:04:18 mail sshd[14644]: Invalid user user from 88.191.116.104
Dec 17 09:04:21 mail sshd[14827]: Invalid user user from 88.191.116.104
Dec 17 09:04:24 mail sshd[14829]: Invalid user user from 88.191.116.104
Dec 17 09:04:27 mail sshd[14831]: Invalid user user from 88.191.116.104
Dec 17 09:04:30 mail sshd[14833]: Invalid user user from 88.191.116.104
Dec 17 09:04:33 mail sshd[14839]: Invalid user user from 88.191.116.104
Dec 17 09:04:36 mail sshd[14841]: Invalid user user from 88.191.116.104
Dec 17 09:04:38 mail sshd[14843]: Invalid user user from 88.191.116.104
Dec 17 09:04:41 mail sshd[14845]: Invalid user user from 88.191.116.104
Dec 17 09:04:44 mail sshd[14850]: Invalid user user from 88.191.116.104
Dec 17 09:04:47 mail sshd[14852]: Invalid user user from 88.191.116.104
Dec 17 09:04:50 mail sshd[14854]: Invalid user user from 88.191.116.104
Dec 17 09:04:53 mail sshd[14856]: Invalid user amanda from 88.191.116.104
Dec 17 09:04:56 mail sshd[14858]: Invalid user amanda from 88.191.116.104
Dec 17 09:04:59 mail sshd[14865]: Invalid user amanda from 88.191.116.104
Dec 17 09:05:02 mail sshd[14869]: Invalid user amanda from 88.191.116.104
Dec 17 09:05:05 mail sshd[14877]: Invalid user amanda from 88.191.116.104
Dec 17 09:05:08 mail sshd[14879]: Invalid user amanda from 88.191.116.104
Dec 17 09:05:11 mail sshd[14881]: Invalid user amanda from 88.191.116.104
Dec 17 09:05:14 mail sshd[14886]: Invalid user amanda from 88.191.116.104
Dec 17 09:05:17 mail sshd[14888]: Invalid user amanda from 88.191.116.104
Dec 17 09:05:20 mail sshd[14890]: Invalid user amanda from 88.191.116.104
Dec 17 09:05:23 mail sshd[15085]: Invalid user amanda from 88.191.116.104
Dec 17 09:05:26 mail sshd[15089]: Invalid user amanda from 88.191.116.104
Dec 17 09:05:29 mail sshd[15091]: Invalid user amanda from 88.191.116.104
Dec 17 09:05:32 mail sshd[15097]: Invalid user amanda from 88.191.116.104
Dec 17 09:05:34 mail sshd[15103]: Invalid user amanda from 88.191.116.104
Dec 17 09:05:37 mail sshd[15105]: Invalid user amanda from 88.191.116.104
Dec 17 09:05:40 mail sshd[15108]: Invalid user amanda from 88.191.116.104
Dec 17 09:05:43 mail sshd[15110]: Invalid user amanda from 88.191.116.104
Dec 17 09:05:46 mail sshd[15115]: Invalid user amanda from 88.191.116.104
Dec 17 09:05:49 mail sshd[15117]: Invalid user amanda from 88.191.116.104
Dec 17 09:05:52 mail sshd[15120]: Invalid user amanda from 88.191.116.104
Dec 17 09:05:55 mail sshd[15122]: Invalid user amanda from 88.191.116.104
Dec 17 09:05:58 mail sshd[15124]: Invalid user amanda from 88.191.116.104
Dec 17 09:06:01 mail sshd[15126]: Invalid user amanda from 88.191.116.104
Dec 17 09:06:04 mail sshd[15206]: Invalid user amanda from 88.191.116.104
Dec 17 09:06:07 mail sshd[15274]: Invalid user amanda from 88.191.116.104
Dec 17 09:06:10 mail sshd[15407]: Invalid user amanda from 88.191.116.104
Dec 17 09:06:13 mail sshd[15466]: Invalid user amanda from 88.191.116.104
Dec 17 09:06:16 mail sshd[15472]: Invalid user amanda from 88.191.116.104
Dec 17 09:06:19 mail sshd[15474]: Invalid user amanda from 88.191.116.104
Dec 17 09:06:21 mail sshd[15476]: Invalid user amanda from 88.191.116.104
Dec 17 09:06:24 mail sshd[15672]: Invalid user amanda from 88.191.116.104
Dec 17 09:06:27 mail sshd[15676]: Invalid user amanda from 88.191.116.104
Dec 17 09:06:30 mail sshd[15679]: Invalid user amanda from 88.191.116.104
Dec 17 09:06:33 mail sshd[15685]: Invalid user amanda from 88.191.116.104
Dec 17 09:06:36 mail sshd[15687]: Invalid user amanda from 88.191.116.104
Dec 17 09:06:39 mail sshd[15689]: Invalid user amanda from 88.191.116.104
Dec 17 09:06:42 mail sshd[15691]: Invalid user amanda from 88.191.116.104
Dec 17 09:06:45 mail sshd[15696]: Invalid user amanda from 88.191.116.104
Dec 17 09:06:48 mail sshd[15698]: Invalid user amanda from 88.191.116.104
Dec 17 09:06:52 mail sshd[15700]: Invalid user amanda from 88.191.116.104
Dec 17 09:06:55 mail sshd[15702]: Invalid user amanda1 from 88.191.116.104
Dec 17 09:06:58 mail sshd[15704]: Invalid user amanda2 from 88.191.116.104
Dec 17 09:07:01 mail sshd[15706]: Invalid user cyrus from 88.191.116.104
Dec 17 09:07:04 mail sshd[15712]: Invalid user cyrus from 88.191.116.104
Dec 17 09:07:06 mail sshd[15714]: Invalid user cyrus from 88.191.116.104
Dec 17 09:07:09 mail sshd[15723]: Invalid user cyrus from 88.191.116.104
Dec 17 09:07:12 mail sshd[15728]: Invalid user cyrus from 88.191.116.104
Dec 17 09:07:15 mail sshd[15735]: Invalid user cyrus from 88.191.116.104
Dec 17 09:07:18 mail sshd[15739]: Invalid user cyrus from 88.191.116.104
Dec 17 09:07:21 mail sshd[15741]: Invalid user cyrus from 88.191.116.104
Dec 17 09:07:24 mail sshd[15743]: Invalid user cyrus from 88.191.116.104
Dec 17 09:07:27 mail sshd[15937]: Invalid user cyrus from 88.191.116.104
Dec 17 09:07:30 mail sshd[15939]: Invalid user cyrus from 88.191.116.104
Dec 17 09:07:33 mail sshd[15945]: Invalid user cyrus from 88.191.116.104
Dec 17 09:07:36 mail sshd[15947]: Invalid user cyrus from 88.191.116.104
Dec 17 09:07:39 mail sshd[15949]: Invalid user cyrus from 88.191.116.104
Dec 17 09:07:42 mail sshd[15954]: Invalid user cyrus from 88.191.116.104
Dec 17 09:07:44 mail sshd[15959]: Invalid user cyrus from 88.191.116.104
Dec 17 09:07:47 mail sshd[15966]: Invalid user cyrus from 88.191.116.104
Dec 17 09:07:50 mail sshd[15971]: Invalid user cyrus from 88.191.116.104
Dec 17 09:07:53 mail sshd[16008]: Invalid user cyrus from 88.191.116.104
Dec 17 09:07:56 mail sshd[16010]: Invalid user cyrus from 88.191.116.104
Dec 17 09:07:59 mail sshd[16012]: Invalid user cyrus from 88.191.116.104
Dec 17 09:08:02 mail sshd[16017]: Invalid user cyrus from 88.191.116.104
Dec 17 09:08:05 mail sshd[16098]: Invalid user cyrus from 88.191.116.104
Dec 17 09:08:08 mail sshd[16158]: Invalid user eric from 88.191.116.104
Dec 17 09:08:10 mail sshd[16286]: Invalid user eric from 88.191.116.104
Dec 17 09:08:13 mail sshd[16353]: Invalid user eric from 88.191.116.104
Dec 17 09:08:16 mail sshd[16359]: Invalid user eric from 88.191.116.104
Dec 17 09:08:19 mail sshd[16362]: Invalid user eric from 88.191.116.104
Dec 17 09:08:22 mail sshd[16364]: Invalid user eric from 88.191.116.104
Dec 17 09:08:25 mail sshd[16368]: Invalid user eric from 88.191.116.104
Dec 17 09:08:28 mail sshd[16527]: Invalid user eric from 88.191.116.104
Dec 17 09:08:31 mail sshd[16563]: Invalid user eric from 88.191.116.104
Dec 17 09:08:34 mail sshd[16570]: Invalid user eric from 88.191.116.104
Dec 17 09:08:37 mail sshd[16572]: Invalid user eric from 88.191.116.104
Dec 17 09:08:40 mail sshd[16574]: Invalid user eric from 88.191.116.104
Dec 17 09:08:43 mail sshd[16576]: Invalid user eric from 88.191.116.104
Dec 17 09:08:46 mail sshd[16581]: Invalid user eric from 88.191.116.104
Dec 17 09:08:49 mail sshd[16583]: Invalid user eric from 88.191.116.104
Dec 17 09:08:51 mail sshd[16585]: Invalid user eric from 88.191.116.104
Dec 17 09:08:54 mail sshd[16587]: Invalid user eric from 88.191.116.104
Dec 17 09:08:57 mail sshd[16589]: Invalid user eric from 88.191.116.104
Dec 17 09:09:00 mail sshd[16591]: Invalid user eric from 88.191.116.104
Dec 17 09:09:03 mail sshd[16597]: Invalid user eric from 88.191.116.104
Dec 17 09:09:06 mail sshd[16599]: Invalid user eric from 88.191.116.104
Dec 17 09:09:09 mail sshd[16601]: Invalid user eric from 88.191.116.104
Dec 17 09:09:12 mail sshd[16603]: Invalid user eric from 88.191.116.104
Dec 17 09:09:15 mail sshd[16609]: Invalid user eric from 88.191.116.104
Dec 17 09:09:18 mail sshd[16612]: Invalid user eric from 88.191.116.104
Dec 17 09:09:21 mail sshd[16619]: Invalid user eric from 88.191.116.104
Dec 17 09:09:24 mail sshd[16622]: Invalid user eric from 88.191.116.104
Dec 17 09:09:27 mail sshd[16624]: Invalid user eric from 88.191.116.104
Dec 17 09:09:30 mail sshd[16744]: Invalid user eric from 88.191.116.104
Dec 17 09:09:32 mail sshd[16823]: Invalid user eric from 88.191.116.104
Dec 17 09:09:35 mail sshd[16826]: Invalid user eric from 88.191.116.104
Dec 17 09:09:38 mail sshd[16828]: Invalid user eric from 88.191.116.104
Dec 17 09:09:41 mail sshd[16830]: Invalid user eric from 88.191.116.104
Dec 17 09:09:44 mail sshd[16835]: Invalid user eric from 88.191.116.104
Dec 17 09:09:47 mail sshd[16837]: Invalid user eric1 from 88.191.116.104
Dec 17 09:09:50 mail sshd[16839]: Invalid user eric2 from 88.191.116.104
Dec 17 09:09:53 mail sshd[16841]: Invalid user patrick from 88.191.116.104
Dec 17 09:09:56 mail sshd[16844]: Invalid user patrick from 88.191.116.104
Dec 17 09:09:59 mail sshd[16846]: Invalid user patrick from 88.191.116.104
Dec 17 09:10:02 mail sshd[16848]: Invalid user patrick from 88.191.116.104
Dec 17 09:10:05 mail sshd[16943]: Invalid user patrick from 88.191.116.104
Dec 17 09:10:08 mail sshd[17109]: Invalid user patrick from 88.191.116.104
Dec 17 09:10:11 mail sshd[17119]: Invalid user patrick from 88.191.116.104
Dec 17 09:10:14 mail sshd[17125]: Invalid user patrick from 88.191.116.104
Dec 17 09:10:17 mail sshd[17318]: Invalid user patrick from 88.191.116.104
Dec 17 09:10:20 mail sshd[17320]: Invalid user patrick from 88.191.116.104
Dec 17 09:10:23 mail sshd[17322]: Invalid user patrick from 88.191.116.104
Dec 17 09:10:26 mail sshd[17329]: Invalid user patrick from 88.191.116.104
Dec 17 09:10:29 mail sshd[17332]: Invalid user patrick from 88.191.116.104
Dec 17 09:10:31 mail sshd[17438]: Invalid user patrick from 88.191.116.104
Dec 17 09:10:34 mail sshd[17534]: Invalid user patrick from 88.191.116.104
Dec 17 09:10:37 mail sshd[17536]: Invalid user patrick from 88.191.116.104
Dec 17 09:10:40 mail sshd[17538]: Invalid user patrick from 88.191.116.104
Dec 17 09:10:43 mail sshd[17540]: Invalid user patrick from 88.191.116.104
Dec 17 09:10:46 mail sshd[17545]: Invalid user patrick from 88.191.116.104
Dec 17 09:10:49 mail sshd[17547]: Invalid user patrick from 88.191.116.104
Dec 17 09:10:52 mail sshd[17549]: Invalid user patrick from 88.191.116.104
Dec 17 09:10:55 mail sshd[17551]: Invalid user patrick from 88.191.116.104
Dec 17 09:10:58 mail sshd[17553]: Invalid user patrick from 88.191.116.104
Dec 17 09:11:01 mail sshd[17555]: Invalid user patrick from 88.191.116.104
Dec 17 09:11:04 mail sshd[17562]: Invalid user patrick from 88.191.116.104
Dec 17 09:11:06 mail sshd[17564]: Invalid user patrick from 88.191.116.104
Dec 17 09:11:09 mail sshd[17566]: Invalid user patrick from 88.191.116.104
Dec 17 09:11:12 mail sshd[17568]: Invalid user patrick from 88.191.116.104
Dec 17 09:11:15 mail sshd[17574]: Invalid user patrick from 88.191.116.104
Dec 17 09:11:18 mail sshd[17576]: Invalid user patrick from 88.191.116.104
Dec 17 09:11:21 mail sshd[17578]: Invalid user patrick from 88.191.116.104
Dec 17 09:11:24 mail sshd[17580]: Invalid user patrick from 88.191.116.104
Dec 17 09:11:27 mail sshd[17582]: Invalid user patrick1 from 88.191.116.104
Dec 17 09:11:30 mail sshd[17589]: Invalid user patrick2 from 88.191.116.104
Dec 17 09:11:33 mail sshd[17595]: Invalid user sarah from 88.191.116.104
Dec 17 09:11:36 mail sshd[17789]: Invalid user sarah from 88.191.116.104
Dec 17 09:11:38 mail sshd[17791]: Invalid user sarah from 88.191.116.104
Dec 17 09:11:41 mail sshd[17794]: Invalid user sarah from 88.191.116.104
Dec 17 09:11:44 mail sshd[17800]: Invalid user sarah from 88.191.116.104
Dec 17 09:11:47 mail sshd[17802]: Invalid user sarah from 88.191.116.104
Dec 17 09:11:50 mail sshd[17804]: Invalid user sarah from 88.191.116.104
Dec 17 09:11:53 mail sshd[17806]: Invalid user sarah from 88.191.116.104
Dec 17 09:11:56 mail sshd[17808]: Invalid user sarah from 88.191.116.104
Dec 17 09:11:59 mail sshd[17810]: Invalid user sarah from 88.191.116.104
Dec 17 09:12:02 mail sshd[17812]: Invalid user sarah from 88.191.116.104
Dec 17 09:12:05 mail sshd[17890]: Invalid user sarah from 88.191.116.104
Dec 17 09:12:08 mail sshd[17959]: Invalid user sarah from 88.191.116.104
Dec 17 09:12:11 mail sshd[18122]: Invalid user sarah from 88.191.116.104
Dec 17 09:12:14 mail sshd[18155]: Invalid user sarah from 88.191.116.104
Dec 17 09:12:16 mail sshd[18161]: Invalid user sarah from 88.191.116.104
Dec 17 09:12:19 mail sshd[18163]: Invalid user sarah from 88.191.116.104
Dec 17 09:12:22 mail sshd[18165]: Invalid user sarah from 88.191.116.104
Dec 17 09:12:25 mail sshd[18167]: Invalid user sarah from 88.191.116.104
Dec 17 09:12:28 mail sshd[18171]: Invalid user sarah from 88.191.116.104
Dec 17 09:12:31 mail sshd[18174]: Invalid user sarah from 88.191.116.104
Dec 17 09:12:34 mail sshd[18185]: Invalid user sarah from 88.191.116.104
Dec 17 09:12:37 mail sshd[18375]: Invalid user sarah from 88.191.116.104
Dec 17 09:12:40 mail sshd[18383]: Invalid user sarah from 88.191.116.104
Dec 17 09:12:43 mail sshd[18385]: Invalid user sarah from 88.191.116.104
Dec 17 09:12:46 mail sshd[18390]: Invalid user sarah from 88.191.116.104
Dec 17 09:12:49 mail sshd[18392]: Invalid user sarah from 88.191.116.104
Dec 17 09:12:52 mail sshd[18394]: Invalid user sarah from 88.191.116.104

When I realized that someone was doing something nasty, I changed some /etc/sshd_config security parameters and restarted the sshd service and made the attacker went to /dev/null

Here are some suggestions for sshd config:

  1. Change the default sshd port (22) to something else (>1024)
  2. Disable root login
  3. Limit login attempts
  4. Block the source IP that violate this rule (you can use Fail2Ban)
  5. Use complex password (combination of alphs, number, and special chars, more than 8 chars, not available in english dictionary)

I hope this kind of attack doesn’t happen anymore🙂

2 responses to “Someone tried to log into my server

    • karfianto December 18, 2011 at 9:21 pm

      and 13 seconds.

      Mungkin boleh juga itu dijadikan KPI atau SLA bagi security engineer,
      Kalau di data centre ada Maximum Time To Fail (MTTF), Maximum Time To Recover (MTTR), dan Maximum Time Between Failure (MTBF),
      Ditambahkan Maximum Time Of Detection (MTOD) dan Maximum Time Under Attack (MTUA), dalam satuan detik..🙂

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