The malware often hides behind fake CAPTCHAs and has been used to commit financial fraud. Microsoft took down 2,300 domains that ran it and updated Defender to identify it.

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

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.