U.S. markets closed

Crypto exchanges OKEx and Bitfinex hit by DDoS attacks

Yogita Khatri

Crypto exchange OKEx experienced a Distributed Denial-of-Service (DDoS) attack last night, but says no user is affected.

An OKEx spokesperson told The Block that the attack was a malicious attempt to disrupt normal traffic of the exchange's server with a flood of Internet traffic. OKEx CEO Jay Hao described the attack as "large-scale," on his Weibo account, saying that competitor(s) was behind it.

OKEx's technical support team spotted the attack and reacted "quickly" to resolve the issue, said the spokesperson. "With our 24/7 technical support and monitoring, it was properly handled within a short period of time, and no client is impacted."

"We will continue getting well-prepared in protecting users," the spokesperson added. 

Crypto exchange Bitfinex also appears to have been targeted by a DDoS attack today. The exchange said on Twitter that it is investigating the issue and will update users as it learns more.

Several exchanges in the past have been a target of DDoS attack, including Huobi and now-defunct platform BTC-e. US authorities seized BTC-e in 2017 on money laundering charges and also arrested the exchange's suspected operator Alexander Vinnik. Last month, French officials also charged Vinnik with multiple counts, including extortion and money laundering.

UPDATE (4:35 am EST): This story has been updated with information from Bitfinex.