Microsoft and law enforcement have announced a court-authorized takedown of Lumma, a prolific info-stealer malware operation found on more than 394,000 Windows PCs globally, mostly in Brazil, Europe, and the United States.

Microsoft said Wednesday that it broke down the Lumma Stealer malware project with the help of law enforcement officials across the globe.

Microsoft has led a global takedown of Lumma Stealer, a long-running malware-as-a-service network. Microsoft worked with law enforcement agencies in the US, Europe and Japan to block around 2,300 malicious domains that formed the backbone of the group’s criminal infrastructure.