It seems a rather unpleasant person has gained access to a key email account, which in turn has allowed them to compromise the DayZ server network. Anyone who provided login credentials to the DayZ team should consider those credentials compromised. Likewise, a trojan was placed on the US mirror as dayz_auto_updater.exe, and this will have installed back-doors on systems that executed it.
Server admins, get someone to make coffee, because you’ve got a fair bit of work to do to see if you’re safe, or to fix things if you’re not. DayZ forum users, your forum passwords have been leaked. Change them.