You know a question this begs, though, then is this a matter of the Lord allowing very limited, trollish power to demons? It they can, inherently, so manipulate the material realm, why are they not using weapons to murder for Satan? Why does all the visible, material evil need man's hand in it? Why aren't they going around even blowing out the pilots of gas stoves and turning the gas on, for instance? If not this, why and how this purported power over somebody's hard drive?
Prove they do not. demons interaction with our dimensions is difficult and restricted but not impossible it is easier to interact and posses humans as we also exist in the spiritual, ie our Spirits, it is not at all difficult to oppress people, give them negativity and bad thoughts, even bringing them to do evil things like mass killing.
Problem is if someone claims that an airplane fell out of the sky due to demonic activity then you will be laughed at and even Christians will be sceptical, but things like that proberbly happen more than we think they do or prepared to admit. I know a prominent Christian who has the ear of the Prime Minister and other high ups, had a seminar with him a few year back and he claimed there was more than enough proof that plane crash at, oh forget off hand, one of the main UK airports, was brought down by demonic activity summoned by a covern that met in the woods at end of runway.