WASHINGTON — The Justice Department said on Monday that it had seized much of the ransom that a major U.S.

The Justice Department said it seized 63.7 Bitcoins, valued at about $2.3 million.

Monaco, the deputy attorney general, said at the news conference at the Justice Department.

Justice Department officials said that Colonial’s willingness to quickly loop in the F.B.I.

helped recoup the ransom portion, and they credited the company for its role in a first-of-its-kind effort by a new ransomware task force in the department to hijack a cybercrime group’s profits.

and the Justice Department to notify them of the attack, investigators helped Colonial understand the hackers and their tactics.

Russia typically does not arrest or extradite suspects in ransomware attacks.

Officials said they had identified a virtual currency account, often referred to as a wallet, that DarkSide used to collect payment from a ransomware victim — identified in court papers only as Victim X, but whose hacking details match Colonial’s.

Weeks after DarkSide attacked Colonial, REvil used ransomware to try to extort money from JBS, one of the world’s largest meat processors.

White House officials said last week that they were working to address issues with cryptocurrency, which has enabled ransomware attacks for years.

was investigating 100 software variants used in ransomware attacks, demonstrating the scale of the problem.

officials have been careful not to directly tie the ransomware attacks to Russia, Mr.

Wray and others have said that the country protects cybercriminals.

Wray said last week.

Anne Neuberger, the deputy national security adviser for cyber and emerging technologies, warned American businesses last week that ransomware had taken a dark turn, noting a recent shift “from stealing data to disrupting operations.”.