North Korea’s Lazarus Group is the most prolific crypto thief in history, estimated to have stolen over $3 billion from crypto protocols and exchanges since 2017. The group — a unit of North Korea’s military intelligence agency — has been linked to the Ronin bridge hack ($625M), the Harmony Horizon bridge hack ($100M), numerous smaller DeFi exploits, and sophisticated social engineering campaigns targeting crypto developers and employees.
The attack methods are sophisticated and evolving. Lazarus operatives have posed as recruiters offering job opportunities to crypto developers, sending malicious code disguised as coding tests. They’ve compromised supply chain dependencies used by crypto projects. They’ve deployed fake trading bots and DeFi tools containing backdoors. In some cases, North Korean IT workers have been hired directly by crypto companies under false identities, gaining access to internal systems from the inside.
Laundering the stolen funds is a challenge that Lazarus has partially solved. The group uses chain-hopping (moving funds across multiple blockchains), mixing services (Tornado Cash, Sinbad), peer-to-peer exchanges, and over-the-counter brokers in jurisdictions with weak AML enforcement. Despite aggressive tracking by firms like Chainalysis and Elliptic, North Korea has successfully laundered billions — funds that the US government believes finance the country’s nuclear weapons and ballistic missile programs.
The implications for the crypto industry are sobering. State-sponsored actors with unlimited resources and no legal constraints are actively targeting every significant crypto protocol. The Lazarus Group alone may be responsible for more crypto losses than all other hackers combined. Defending against nation-state attackers requires security practices far beyond what most crypto teams implement — and the gap between required security and actual security is a systemic risk that the entire industry shares.
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