Binance and Huobi have once more suspended accounts associated with the June 24, 2022, $100 million Harmony Horizon bridge attack. The trading platforms blocked over $1.4 million worth of cryptocurrency from accounts associated with the infamous Lazarus Group operating in North Korea.

Elliptic, a blockchain analytics startup, conducted the investigation, according to a report the company released on Feb. 14. However, the company did not specify which coins or tokens had been frozen.

"The stolen funds remained dormant until recently, when our investigators began to see them funneled through complex chains of transactions, to exchanges," Elliptic wrote. "By promptly notifying these platforms about these illicit deposits, they were able to suspend these accounts and freeze funds."

Elliptic added that it shared the information with Binance and Houbi, which swiftly froze the Lazarus Group-affiliated accounts.

Since the Harmony breach, it has been publicly reported that Lazarus Group resorted to the now OFAC-sanctioned privacy mixer Tornado Cash in an attempt to obfuscate the transaction trace leading back to the initial heist.

In spite of the fact that this apparently makes it easier to cash out assets at an exchange, Elliptic investigators were able to trace all of the stolen monies routed through the mixer in this instance, according to the report.

Simone Maini, the chief executive officer of Elliptic, opined that the events demonstrated the industry's willingness to combat money laundering and prevent cryptocurrencies from becoming "sanctuaries" for illegal activities.

"Today, money laundering was detected and stolen funds linked to North Korea were frozen, in real-time," Maini said. "As an industry, we have the power and responsibility to prevent digital assets becoming a haven for money launderers and sanctions evaders, and ensure that they are a force for good."

The attack on the Harmony bridge was also attributed to the Lazarus Group on January 24 by the United States Federal Bureau of Investigation (FBI).

This is not the first time that Binance and Huobi have collaborated on this issue.

The two platforms were able to freeze and recover 121 Bitcoin (BTC), valued at $2.5 million at the time, associated with the January 16 Harmony attack.

According to crypto detective ZachXBT, only a part of the $63.5 million laundered over the weekend was recovered. According to ZachXBT, the funds were routed through the Ethereum-based anonymity protocol RAILGUN before being transmitted to three exchanges.