I used a security app and it was the only app at the time that came up as a malware threat. I read some of the reviews and they said the same thing.... Which is crazy because it is one of the most downloaded flashlight apps on the market.
I don't know how long it will take, for me it was shortly after I grabbed the app. I started getting weird notifications... Then I asked some questions, downloaded airpush detector and avast! mobile security, and found that to be the culprit... They may have changes it since then, it was a few months ago. But I thought I should give you the heads up anyway.