Myetherwallet or MEW is a secure wallet for storing ETH and altcoins. But no matter how secure MEW is, it all depends on you being extra cautious. We have what we called PHISHING in which according to Wikipedia is an attempt to obtain information from a user of his username, password, email (anything that pertains to an asset) through disguising as a trustworthy entity. For example, phishing (email)[Click to view]

So to avoid getting phished, check always on the URL of MEW it should have MyEtherWallet Inc [US]