These sites have you enter your username/password and 2FA code, the hacker then logs into your account.  One of these sites also makes you wait 2 minutes since there is a 2 minute withdrawal freeze after a login. The sites then tell you your login was incorrect even though the hackers have now logged in.  You then enter another 6 digit code as asked by the phishing site and they use this code to withdrawal your funds.

Please make sure to bookmark https://www.bittrex.com and never search for the site. 

Unfortunately, these advertisements cannot be prevented and take some time to take down with official requests.