Sorry to hear this. =I

A situation similar to yours lately took place with Opalcoin; some developer not related to the project had created a trojaned version of the Opal wallet that stole people's coins. A great portion was returned through negotiating with the thief, but a lot still went missing. This lead into the discussion of whether or not it would be able to somehow earmark the stolen coins, preventing them from being sold.

As of now, no solution exists to do this. It's a two-edged sword since doing it would be to significantly eat away the P2P nature of cryptos. Still, it is something that needs to and will be looked into much more deeply.

Yours,

Jyri
--
Altcoin.Center

P.S. Should I have any GB myself I'd be glad to cover at least part of your losses. The thing is however, that I have zero, and I intend to keep it that way at least for now. While some may find this weird, I feel it's a good way to show that I'm not in this for the typical quick profit & runaway scam. I have big plans for GB that I believe will be of much use for the whole crypto scene.