As the sanctions-evading scheme has grown, so too has the U.S. government’s response.

The State Department also announced financial rewards totaling up to $6 million for information leading to the arrest or conviction of Garantex’s leaders.

The Russian cybercrime group attacked more than 180 organizations before members abandoned the brand and dispersed to new ransomware groups earlier this year.

It’s the first formal attribution for the campaign that has swept up data from at least nine telecoms and the Treasury Department. 

The department’s Office of Foreign Assets Control said Guan Tianfeng used a zero-day exploit to deploy malware on 81,000 firewalls.

The mixer was sanctioned after a North Korea hacking group used the software to launder more than $455 million.

North Korea's use of malicious cyber activity to evade international sanctions has become a growing problem for U.S. national security.

A sharp increase in crypto-currency related sanctions resulted in far more crypto transactions being considered illicit.

The virtual currency exchange based in Washington state failed to catch more than 100,000 transactions from sanctioned regions.

The address received $600 million in Ethereum and other digital currency during the March attack, crypto-tracking company Chainalysis said.