In a recent "sticky" thread on Battle.net forums a new threat targetting WOW players has been reported. The Trojan "Disker" is able to compromise even the accounts using Authenticator Protection. It steals both the account credentials and Authenticator password. To verify if the machine has been compromised with the trojan it is advised to create a MSinfo file and check in it for following entries in the Startup programs section:
Disker rundll32.exe c:\users\name\appdata\local\temp\w_win.dll,dw Name-PC\Name Startup
Disker64 rundll32.exe c:\users\name\appdata\local\temp\w_64.dll,dw Name-PC\Name Startup
Trojan originates from a fake Curse website offering malicious Curse clients for downloads - the website itself was popping-up recently on major search engines while looking for "curse client" phrase.
Blizzard advises to report any compromised account directly alongside of information regarding installed addons or plugins...