Hmmm. I was thinking this was somewhat serious, as the payment is demanded in BitCoin denominations (0.6 BitCoins), which are not cheap. People appear to be paying it, however.
Its serious, no question about it. In the earlier versions of the virus there put the file.
Here’s an article on it. - http://www.pcworld.com/article/2084002/how-to-rescue-your-pc-from-ransomware.html