DNS Poinsoning attack:

• DNS (Domain Name Service) translates IP adresses to domains (like myetherwallet.com)
• When an attacker is able to change the entry in this service your URL seems okay but it is linked to the "malicous" IP.
• The attacker sets up a phishing Site, which looks like the original one. With this the Keys can get harvested

How to avoid getting scamed

• Always check the Certificate ! (Left side of your URL bar )

Please be aware to phishing attacks and stay safe !