ZDNET - Zdnet

A criminal gang has launched DDoS attacks against some of the world's biggest financial service providers and demanded Bitcoin payments as extortion fees to stop their attacks. The group has attacked money transfer service MoneyGram, YesBank India, Worldpay, PayPal, Braintree, and Venmo, a source involved in the DDoS mitigation field. The New Zealand stock exchange (NZX), which halted trading for the third day in a row today, is also one of the group's victims.