In the process, it has been estimated that close to 2 million usernames and passwords have been stolen. According their report, this hack took place on the 10th of July. “Dota2 official forums was hacked on July 10th, 2016 (http://dev.dota2.com). This data set contains 1,923,972 records. Each record contains an email address, ip address, username, user identifier, and one password.”
The report also lists the providers of the email addresses that have been stolen, with Google taking the number one spot and accounting for a little over a million. Coming in second place is Hotmail, followed by Yahoo in third. It’s actually a little alarming that this took place about a month ago and no one noticed.
Valve has yet to respond to these claims, but in the meantime if you’d like to check to see if your username and password was stolen, head on over to Leaked Source’s website to check for yourself.