North Korean Hackers Responsible for Last Month’s Ronin Theft, FBI Confirms

Hacker collectives Lazarus Group and APT38 ar responsible for the theft, the FBI said

article-image

Blockworks Exclusive art by axel rangel

share

key takeaways

  • The Lazarus Group and APT38 have been named as those responsible for the theft
  • Exploiters used hacked private keys to forge withdrawals on March 23, Ronin said

The US Federal Bureau of Investigation has placed “cyber actors” from North Korea at the heart of last month’s $625 million hack on the Ethereum-linked sidechain Ronin Network.

Through an investigation, the agency said it was able to “confirm” hacker collectives Lazarus Group and APT38 are responsible for the theft of hundreds of millions of dollars in crypto, a Thursday statement reads.

Exploiters, according to Ronin, used hacked private keys to forge withdrawals on March 23. The breach wasn’t discovered until several days later, when a user was unable to withdraw 5,000 ETH.

State-sponsored Lazarus has been accused of multiple digital asset-based hacks, including a year-long endeavor beginning in 2017 in which the group reportedly managed to siphon off $571 million.

The Treasury Department last week sanctioned the hacking collective and the Ethereum address allegedly behind the theft.

As part of its efforts to combat blockchain-related crime, the FBI established a new unit last month led by Eun Young Choi, a former senior counsel to the deputy attorney general.

The group, along with APT38, operates at the behest of the Democratic People’s Republic of Korea (DPRK) under dictator Kim Jong Un. The isolated northern nation on the Korean Peninsula is strangled by economic sanctions and threatened by military encirclement from Western allies over its continued use of nuclear arms.

Cryptocurrency is viewed by some experts as a means to circumvent capital controls and economic sanctions, as well as to hide the wealth of North Korea’s political elite. It has also been speculated it is one of several mechanisms that fund Kim’s heavily sanctioned regime.

“The FBI…will continue to expose and combat the DPRK’s use of illicit activities – including cybercrime and cryptocurrency theft,” the statement said.


Get the news in your inbox. Explore Blockworks newsletters:

  • Blockworks Daily: The newsletter that helps thousands of investors understand crypto and the markets, by Byron Gilliam.
  • Empire: Start your morning with the top news and analysis to inform your day in crypto.
  • Forward Guidance: Reporting and analysis on the growing intersection of crypto and macroeconomics, policy and finance.
  • 0xResearch: Alpha directly in your inbox. Market highlights, data, degen trade ideas, governance updates, token performance and more.
  • Lightspeed: Built for Solana investors, developers and community members. The latest from one of crypto’s hottest networks.
  • The Drop: For crypto collectors and traders, covering apps, games, memes and more.
Tags

Upcoming Events

Industry City | Brooklyn, NY

TUES - THURS, JUNE 24 - 26, 2025

Permissionless IV serves as the definitive gathering for crypto’s technical founders, developers, and builders to come together and create the future.If you’re ready to shape the future of crypto, Permissionless IV is where it happens.

Old Billingsgate

Mon - Wed, October 13 - 15, 2025

Blockworks’ Digital Asset Summit (DAS) will feature conversations between the builders, allocators, and legislators who will shape the trajectory of the digital asset ecosystem in the US and abroad.

recent research

Research

article-image

Luke Barwikowski took to Twitter to raise awareness about the threats against him and his family

article-image

David Chaum’s ecash in the 90s offers insights into balancing priorities in DeFi today

article-image

The forthcoming stablecoin was praised by BitGo’s Mike Bleshe as an advancement in “institutional-ready digital assets”

article-image

Chronicle’s Niklas Kunkel talked to Blockworks about the raise and why he’s prioritizing research

article-image

Sponsored

DESK isn’t just another trading platform — it’s redefining what’s possible in on-chain trading

article-image

The real strength of tailored AMMs might lie in their capacity to cultivate deeper loyalty and engagement within niche communities