Awesome
telnetlogger
This is a simple program to log login attempts on Telnet (port 23).
It's designed to track the Mirai botnet. Right now (Oct 23, 2016) infected Mirai machines from around the world are trying to connect to Telnet on every IP address about once per minute. This program logs both which IP addresses are doing the attempts, and which passwords they are using.
I wrote it primarily because installing telnetd on a Raspberry Pi wasn't sufficient.
For some reason, the Mirai botnet doesn't like the output from Telnet, and won't try
to login. So I needed something that produced the type of Telnet is was expecting. While
I was at it, I also wrote some code to parse things and extract the usernames/passwords.
Usage
Just run the program in order to see passwords and IP addresses appear on stdout.
telnetlogger
To log the information to files, use the -p and -i options.
telnetlogger -p passwds.txt -i ips.txt
To listen on another port (for testing and whatnot), use -l.
telnetlogger -l 2323
Note that on many systems, you'll get an "access denied" error message, because programs
that open ports below 1024 need extra priveleges. So you may need to sudo the program.
Compiling
Type make or:
gcc telnetlogger.c -o telnetlogger -lpthread
It'll also compile/run on Windows.
Output
There are two sample output files, passwords.txt and ips.txt that
I generated by running this for the last day.
The program prints the username/password combination one line at a time.
admin 7ujMko0admin
root root
root 54321
root xmhdipc
root root
guest 12345
root 888888
root 123456
admin smcadmin
It doesn't filter duplicates. The easiest way to get rid of duplicates is
just to sort/uniq the output.
sort passwords.txt | uniq
The IP addresses work the same way as the passwords, with one per line.
153.99.123.134
114.35.226.25
114.35.226.25
1.52.107.87
2001:db8:a0b:12f0::1
114.35.226.25
1.52.107.87
1.52.107.87
153.99.123.134
Note that IPv6 is supported. Also note that you'll get lots of duplicates,
so you'll be doing sort/uniq a lot in order to reduce the list size. The
duplicates will make it easier to count how often individual IP address's attempt
to connection. Thus, you can run the following:
sort ips.txt | uniq -c | sort -n
This produces results like:
69 187.136.91.145
75 79.115.23.228
90 178.220.226.25
94 153.99.123.134
120 171.83.163.1
168 111.73.37.102
169 122.96.31.201
414 119.121.165.137
Geolocation
This project can help you geo-locate the IPs, to see which country they are coming from.
https://github.com/danielmiessler/HoneyCredIPTracker