I do not believe software can directly force the PC to shutdown, it has to go through the power management API to request a shutdown and that would usually lead to a prompt to confirm the shutdown or at least a normal shutdown procedure, not an immediate power cut.
For the "gameloft" virus, never heard of such a thing. The only viral gameloft I know is about greedy micro transaction (if $50 for a practically inconsequential amount of in-game resources can still be considered micro) village builder games.