North Korea's state-backed hackers have an “aggressive, relentless” knack for finding and exploiting vulnerabilities, making them more dangerous than other groups, a former FBI agent told Benzinga. North Korean hackers pose an existential threat to cryptocurrency ecosystems, having stolen over $2 billion worth of assets in 2025 alone. Things have worsened in 2026, with April recording the highest number of cryptocurrency hacking incidents on record.