The DPRK have been very busy in 2017, mining or stealing an estimated 11,000 bitcoins worth an estimated $200 million USD. There have been numerous reports of South Korean based BitCoin exchanges being hacked or compromised through social engineering attacks, aimed at infiltrating the seemingly secure network perimeters.
North Korea has been attempting to take advantage of the relatively weak security surrounding BitCoin exchanges, whilst also using the digital currency as a go-around for financial sanctions imposed on them by the international community. Their interest in cryptocurrencies appear to be supported by confirmed reports of Pyonyang University offering courses to teach students about cryptocurrencies. This same university is also rumoured to be the training establishment for North Korean hackers.