First of all what is btc
Buy on an Exchange. Several marketplaces called “bitcoin exchanges” allow people to buy or sell bitcoins using different currencies. Mt. Gox is the largest bitcoin exchange. Transfers. People can send bitcoins to each other using mobile apps or their computers.
According to South Korea’s Cyber Warfare Research Center, at least one Bitcoin exchange was targeted by a hacking attempt that possibly originated from North Korea.
It is not yet clear why North Korea would have carried out such an attack if it is, indeed, the perpetrator of the crime. There are, however, several reasons behind it, including the possible theft of Bitcoin in order to raise money for the already cash-strapped government.
According to North Korea University Professor Lim Jong-in, the decision by China to slowly turn away from North Korea’s coal exports added to the financial woes of the latter, so it needs to look for other sources of revenue.
Source is from cointelegraph and google