I use Meta Mask wallet. But I wonder, is it possibble to be attacted by hackers any way? My MEW wallet was stolen, that's why this question is problem for me.
Web based wallets could be attacked by hackers. Metamask is supposed to be an extra layer of security to access your MEW wallet. For some peace of mind, using a hardware wallet like Trezor, Ledger Nano S, etc is the best bet as they're more secured to store one's coins.