The easiest way for a Cyber Criminal to break in to your network is to crack the Administrator or Root user password. That is because the Administrator account or Root user will not be locked out, after multiple failed logins. Therefore they can brute force the password to break in to your network.
Below is a list of the typical User accounts that are under attack every day. Check out also, compromised IP numbers, if your IP number is on this list you are sending out SPAM, and are therefore compromised, and a SPAM network is using your machine to SPAM the world.