It looks like popular exchange for trading ERC20 Tokens - Ether Delta - has been hacked. It looks to be a DNS hack where the hacker is redirecting traffic to a phishing website, then stealing wallets.
According to Ether Delta's twitter, stay off the website and you'll be safe. I hope they're right.
1/2 *IMPORTANT* we have reason to believe that there had been malicious attacks that temporarily gained access to @etherdelta DNS server. We are investigating this issue right now - in the meantime please *DONOT* use the current site.
— EtherDelta (@etherdelta) December 20, 2017