That is why, you always need to double check your address before you confirm the transaction, no matter how strong or genuine your OS or security it, it is still breachable because in the world of IT, there's no system that is safe. Meaning, you should be personally responsible and be observant. But you can reduce the risk of it happening again, install a genuine anti virus and prevent yourself from downloading from sites that aren't trusted. Make sure that you don't have any plugins even in your browser that causes this issue.