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
  • 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:

Tags

Decoding crypto and the markets. Daily, with Byron Gilliam.

Upcoming Events

Javits Center North | 445 11th Ave

Tues - Thurs, March 24 - 26, 2026

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 Report Templates (3).png

Research

South Korea is emerging as one of the most important global hubs for regulated digital assets, and Upbit sits at the center of this shift. Naver’s proposed acquisition could create the country’s dominant super app for payments, trading, and digital finance. This report breaks down the numbers, the regulatory tailwinds, the economics of the deal, and why the merger may unlock one of the most attractive asymmetries in Korea’s public markets.

article-image

Lido unveils a new buyback plan while BTC treasury companies slip below mNAV — can either model can truly return value?

article-image

If financial nihilism has driven you into memecoins, zero-day options, and sports betting, consider financial optimism instead

article-image

A new Sui-based protocol promises to unlock Bitcoin’s idle liquidity and eliminate wrapped-token risk

article-image

Could blockchain rails finally realize Ted Nelson’s non-linear, pro-creator “docuverse”?

article-image

What does Uniswap’s proposal to activate protocol fees and unify incentives mean for UNI token holders?

article-image

A recent mistrial illustrates how juries need more background information when it comes to judging complex systems like Ethereum