The Cointelegraph has released an article confirming that some Kraken accounts have been compromised. With funds being withdrawn to an unknown address leaving some customers with empty balances.
Please everyone enable 2FA immediately. At the very least your Funding/Withdrawal settings and your Master key
If in doubt change your password.
https://cointelegraph.com/news/enable-2fa-kraken-accounts-compromised-funds-stolen