Blockchain surveillance firm Elliptic published a report Friday detailing the exploits of notorious North Korean hacking group Lazarus, which has been “ramping up” activity in recent months.<p>The organization has been linked to five major crypto hacks over the past three months. The latest, according to blockchain data, was the global cryptocurrency exchange CoinEx, which was hacked earlier this week for a now estimated $54 million. All in all, Elliptic estimates that North Korea's Lazarus is responsible for the theft of almost $240 million in crypto in just the past 104 days alone.