On December 19, 2017, South Korean exchange Youbit suffered its second breach of the year, losing 17% of total assets (~3,831 BTC equivalent from the first hack in April). Attackers compromised the hot wallet; cold storage remained secure. Korean authorities attributed the attack to BlueNoroff, a Lazarus subgroup. The exchange permanently closed after this incident.

In the wee hours of December 19, Youbit was dealt a death blow in the form of another hack. The exchange, which was also hit in April, is closing down in the fallout of the most recent attack. As revealed on its website, they had been forced to terminate its services after suffering another hack. The hackers ran off with 17% of Youbit’s funds, enough to drive the exchange into bankruptcy.