Binance, one of the world's largest cryptocurrency exchanges, said hackers withdrew 7,000 bitcoin worth about $40 million via a single transaction in a "large scale security breach," the latest in a long line of thefts in the digital currency space.

The hackers used a "variety of techniques," including phishing and viruses, to obtain a large amount of user data, Binance said in a post on its website. There may be additional accounts that have been affected but not yet identified, Binance said.

The company will use its Secure Asset Fund for Users, an emergency insurance fund, to cover the incident in full and no user funds will be affected, it said.