can it be applied to myetherwallet? I've lost some of my valuable tokens, and I don't know why myetherwallet can be hacked, whereas I've saved private keys in the form of JSON file / Keystore
If you still have some coins in your wallet after you were hacked then it is very likely that you were victim of a hacker that is using some kind of script and that is only looking for a particular coin, so if you can you need to try to make a fresh installation in a different computer and then move your coins from your old address to a new address that you generated in that new virus free computer.