North Korean Hackers Launder Staggering $27 Million in Ethereum from Recent Harmony Bridge Attack: Here's What You Need to Know

North Korea's capital Pyongyang. Source: Adobe/Oleg Znamenskiy

In the aftermath of last year’s attack against the cross-chain bridge provider Harmony, North Korean hackers, who are widely blamed for the incident, are believed to have just finished laundering some ETH 17,278, worth more than $27 million, according to industry observers. 

Crypto hack investigator ZachXBT compiled data from a number of exchanges to come up with the figure, directing a shoutout "to the exchanges who responded quickly on a weekend so funds could be frozen". The researcher also linked to a report containing more than 350 associated crypto addresses.

Later on Jan. 29, ZachXBT disclosed in a tweet that, to date, the researcher has "been able to map out 895 BTC in withdrawals to 14 addresses from the exchanges."

Earlier this month, ZachXBT said that "North Korea’s Lazarus Group had a very busy weekend moving $63.5m (~41000 ETH) from the Harmony bridge hack through Railgun before consolidating funds and depositing on three different exchanges”. 

Railgun is an anonymizing tool which assigns certain levels of privacy protection to transactions.

The United States Federal Bureau of Investigation (FBI) has accused North Korean hackers of perpetrating the attack on Harmony. The Harmony Horizon bridge was compromised last June. The breach is attribute to two Pyongyang-backed groups of hackers, namely the Lazarus Group and APT38. 

In an announcement, the FBI said that, as it "continues to combat malicious cyber activity, including the threat posed by the Democratic People's Republic of Korea (DPRK) to the U.S. and our private sector partners," the investigation enabled the bureau "to confirm that the Lazarus Group (also known as APT38), cyber actors associated with the DPRK, are responsible for the theft of $100 million of virtual currency from Harmony’s Horizon bridge reported on June 24, 2022."

In response to the discovered illicit activities of the hackers, Changpeng 'CZ' Zhao, the CEO of major crypto exchange Binance, tweeted that his company was able to retrieve some of the stolen crypto assets. 

"We detected Harmony One hacker fund movement. They previously tried to launder through Binance and we froze his accounts. This time he used Huobi. We assisted Huobi team to freeze his accounts. Together, 124 BTC have been recovered,” the exchange’s CEO said on Jan. 16. 

In addition to Binance and Huobi, the cyber criminals also attempted to use crypto exchange OKX to launder the stolen crypto assets, according to data obtained by ZachXBT. 

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