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The World of Warcraft support forum has been updated with a blue post that lays out some pretty serious information about a potential trojan that has even cracked through the authenticator security mesure. The trojan can access both a player's account information and authenticator password.
We've been receiving reports regarding a dangerous Trojan that is being used to compromise player's accounts even if they are using an authenticator for protection. The Trojan acts in real time to do this by stealing both your account information and the authenticator password at the time you enter them.
If your account has been compromised recently, I'd recommend looking for the Trojan. It can be identified by creating an MSInfo file and then looking in the Startup Program section of that file for either "Disker" or "Disker64". It will usually appear like this:
Disker rundll32.exe c:users
ameappdatalocal empw_win.dll,dw Name-PCName Startup
Disker64 rundll32.exe c:users
ameappdatalocal empw_64.dll,dw Name-PCName Startup
We are currently looking for more information on the Trojan. We have not been able to locate any anti-virus programs that will remove it besides just reformatting your system. If you have been recently compromised and find it on your system please reply with the following pieces of information.
A list of any addons you recently installed along with where you got them.
A list of any programs you recently installed along with where you got them.
Any security programs you have run and their results.
Join the ongoing discussion on the World of Warcraft forum.