Today, the internet world is not as safe as some may think. Increasingly, we are witnesses of  “Cyber attacks”, that are part of not only hackers themselves but also hacker groups created by government or other organizations.

In May, WannaCry ransomware affected over 200,000 computers in some 150 countries. When WannaCry infects a computer, it encrypts all of files, locks and disables them for the victim of the attack. The ransom for file access is required in Bitcoin. The price for unlocking data and hardware increases with time – if the ransom is not paid on time, the files will remain permanently inaccessible. This attack is generally attributed to North Korea, and another similar incident is probably again a part of Kim Jong Un’s hackers.

South Korea’s National Intelligence Service (NIS) claimed that cyber-attacks on cryptocurrency exchange services are worth North Korea. The NIS has evidence that Pyongyang attacked and stole personal in June from around 30,000 users of Bithumb, the biggest  South Korea´s cryptocurrency exchange, and robbed virtual money from another cryptocurrency exchange, Coins, in September.South Korea’s National Intelligence Service (NIS) suspects Pyongyang of hacking into cryptocurrency exchange services, Yonhap News Agency reported Saturday.

It indicates that the attack was reportedly launched with the help of the same code which has been used by the Lazarus accused of attacking the Sony Pictures company in the film The Interview, about a plot to assassinate North Korean leader Kim Jong Un.

South Korea’s spy agency said North Korean hackers were behind attacks on cryptocurrency exchanges this year in which some 7.6 billion won ($6.99 million) worth of cryptocurrencies was stolen.

Kim In Ryong, North Korea’s Deputy Permanent Representative in the United Nations, said that attempts to link North Korea 181with the cyber attacks were “ridiculous.”