Failed SSHD Login Attempts (15,000 per day) - Is that a lot compared to your server?

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# 1  
Old 09-26-2019
Failed SSHD Login Attempts (15,000 per day) - Is that a lot compared to your server?

The purpose of this thread is for everyone to follow the same methodology so we can create a future table, for the benefit of all, that shows how many failed login attempts (hacking) per day per server (and per minute) are happening.

This is not a thread on writing scripts or creating different methods to get the same data; nor it this a thread on how to prevent brute force logins; This thread has a a very simple (not elegant, not interesting) method that everyone can follow and by using the same very simple method, the results will be easy to compare, apples to apples, as follows:

lastb | wc -l

lastb | head -1
root     ssh:notty   Thu Sep 26 00:50 - 00:50  (00:00)

lastb | tail -1
btmp begins Wed Sep  4 06:52:54 2019

Days Total (approx): 22

330466 / 22 = 15K ssh login attempts which failed each day, or about 10.4 per minute.

Is that a lot compared to your server?

Please post back your results using the same method:


lastb | head -1

lastb | tail -1

Then take the totals days by comparing the dates in the head and tail, and divide that (the days) into the total number from the lastb | wc -l command and post back (just like I did above)


PS: If all replies use the same method, it will be easy to compare the results in a table or chart later. Please do not use any other method than the very simple one above.


If we get enough replies, I will do a video on the results later.
# 2  
Old 09-26-2019
Here is another ubuntu server on the net:

ubuntu2:~# lastb | wc -l; lastb | head -1 ; lastb | tail -1
tomcat   ssh:notty   Thu Sep 26 05:13 - 05:13  (00:00)
btmp begins Sun Sep  1 06:25:30 2019


364528 / 25 = 14,581 per day or 10.1 failed login attempts per minute.

# 3  
Old 09-26-2019
Ubuntu 3:

root@localhost:~# lastb | wc -l; lastb | head -1 ; lastb | tail -1
root     ssh:notty   Thu Sep 26 10:17 - 10:17  (00:00)
btmp begins Sun Sep  1 06:25:10 2019

351459 / 25 = 14,038 per day or 9.7 failed login attempts per minute.

# 4  
Old 09-26-2019
So, far this is pretty interesting.

Three different public servers on the Internet (in the US) with the following "failed login attempts per minute" (FLA/m) or maybe (FLAPM):
  • 10.4
  • 10.1
  • 9.7

That's fairly interesting how three distinct public servers on the net are converging close to 10 FLA/m or 10 FLAPM.

Anyone else care to follow the same methodology so we can compare for the benefit of all readers?
# 5  
Old 09-26-2019
Difficult to follow precisely without lastb, but grepping 'authentication failure' in log files, one of my servers has 66,000 failed logins since Sep 22, which is awfully close to your 15,000 a day. Another's log files are too short to be useful for this...
This User Gave Thanks to Corona688 For This Post:
# 6  
Old 09-26-2019
Thanks Corona688,

Yes, I find it interesting that when we check for different servers with public Internet access, the number of failed ssh login attempts per minute (FLAPM) converges toward ten per minute.

This is why I think it would be useful to document this using, at least on Linux at the beginning, the same method, which is the simple lastb method I posted, since all major Linux systems use lastb to parse and display the auth log for failed login attempts.

If we use the same methodology, the numbers have more meaning, and if it turns out that there is some convergence to, for example, 10 FLAPM, then it would be interesting to try to understand why.
# 7  
Old 09-27-2019
@Neo: Thanks for rephrasing and clarifying your request!

Here's a script which calculates the FLAPM value:


exit_with_message() { echo "$*" ; exit 1 ;}

type lastb >/dev/null 2>&1  || exit_with_message "error: no lastb"
type awk   >/dev/null 2>&1  || exit_with_message "error: no awk"

evaluate() {
   awk '

        function epoch(date,d) { "date -d \""date"\" +%s" | getline d; return d; }

        $10 != ""       { mydate=$4" "$5" "$6" "$7;count++; }
        NR==1           { last=epoch(mydate); }

        END { printf "%9.4f FLAPM\n",count/((last-epoch(mydate))/60)}

lastb | evaluate

Here are some results for servers I manage, which provide services within the internet, partly with fail2ban and changed ssh ports in place:

  0.07 FLAPM
  0.07 FLAPM
  0.10 FLAPM
  0.10 FLAPM
  0.10 FLAPM
  0.11 FLAPM
  0.11 FLAPM
  0.11 FLAPM
  0.12 FLAPM
  0.20 FLAPM
  0.88 FLAPM
  1.12 FLAPM
  1.27 FLAPM
  1.36 FLAPM
  1.61 FLAPM
  1.74 FLAPM
  1.79 FLAPM
  1.92 FLAPM
  1.94 FLAPM
  2.88 FLAPM
  2.95 FLAPM
  3.20 FLAPM
  3.22 FLAPM
  3.35 FLAPM
  3.51 FLAPM
  3.53 FLAPM
  3.62 FLAPM
  3.63 FLAPM
  4.12 FLAPM
  4.75 FLAPM
  4.78 FLAPM
  4.82 FLAPM
  4.92 FLAPM
  4.96 FLAPM
  4.99 FLAPM
  5.07 FLAPM
  5.29 FLAPM
  5.29 FLAPM
  5.35 FLAPM
  5.44 FLAPM
  5.46 FLAPM
  5.54 FLAPM
  5.56 FLAPM
  5.62 FLAPM
  5.79 FLAPM
  5.80 FLAPM
  5.82 FLAPM
  5.85 FLAPM
  5.86 FLAPM
  5.86 FLAPM
  5.91 FLAPM
  6.01 FLAPM
  6.04 FLAPM
  6.25 FLAPM
  6.34 FLAPM
  6.92 FLAPM
  7.54 FLAPM
  8.72 FLAPM
  9.20 FLAPM
 11.01 FLAPM
 11.93 FLAPM
 12.57 FLAPM
 12.90 FLAPM
 13.08 FLAPM
 13.09 FLAPM
 13.35 FLAPM
 13.52 FLAPM
 14.09 FLAPM
 14.58 FLAPM
 14.76 FLAPM
 14.78 FLAPM
 14.80 FLAPM
 15.18 FLAPM
 16.97 FLAPM
 17.18 FLAPM
 17.22 FLAPM
 20.70 FLAPM
 23.57 FLAPM
 40.46 FLAPM

Last edited by stomp; 09-27-2019 at 11:51 AM..
These 2 Users Gave Thanks to stomp For This Post:
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