Here is a quick post on how to check you don't have any malicious services running on your machine.
$ netstat -antup | grep LISTEN
It will list all sockets listening for connections on your machine, and the associated process. Check if there is no suspect telnet running...
Also, check your crontab:
$ crontab -l
$ crontab -e
List and edit weird jobs. Don't forget to do that for all users that can log in.
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