So, the Starcraft II: Wings of Liberty, is officially available, however, if you've obtained a copy of the game from torrents or darksites, note; Microsoft reports aout "samples that pretend to be Starcraft-related files but are actually malware."
"For instance, "Starcraft_II.exe" (Sha1: ae648158b87d1513d2777ddb2233d3e83e2741c9) contains a file named "WinUpdate.exe", which's actually malicious and is detected as VirTool:Win32/VBInject.gen!DM. This's a generic detection for Visual Basic-compiled files that attempt to load other malware by injecting code into different processes.
Another file "StarCraft.2.Wings.Of.Liberty.CLONEDVD-WW TRAINER.exe" (Sha1: fdaa5abd53256a3fb0ddca5d3dead622768b3ab2). detect as Worm:Win32/Rebhip.A. is a worm capable of stealing sensitive information from your computer by logging keystrokes and gathering passwords.
Enjoy playing!, but be "vigilant".