The people who were compromising the majority of the accounts have:
a) A botnet with at least 270,000 IPs we've seen so far.
b) A list with over 5 million email addresses and passwords, almost all of which are not people who have ever heard of Path of Exile.
They try the passwords on our website and are IP banned pretty quickly, which is when they change IP.
This email and password list has not come from us. It contains users from many other web services and is probably a concatenation of stolen lists from dozens of sites and games. They are trying it against Path of Exile because it gives them free accounts if they do stumble in to any. This is why it's important to use a unique password. I'm not saying every compromised account came from their use of this list, but it's certainly the bulk of them.
Since we deployed the security patch in 0.10.1d, the rate of account compromise dropped off almost completely because they have no way to log into...
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