Microsoft Threat Intelligence observed the persistent growth and operational sophistication of Lumma Stealer, an info-stealing malware used by multiple financially motivated threat actors to target various industries.

Lumma Stealer operation hit 400,000 computers worldwide before coordinated takedown shut down Russian cybercrime kingpin.

Earlier this month, a coordinated disruption action targeting the Lumma malware-as-a-service (MaaS) information stealer operation seized thousands of domains, part of its infrastructure backbone worldwide.

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

US, European, and Japanese authorities, along with tech companies including Microsoft and Cloudflare, say they’ve disrupted Lumma, an infostealer popular with criminal gangs.

Microsoft Corporation (NASDAQ:MSFT) revealed Wednesday that it has dismantled the Lumma Stealer malware operation, which infected more than 394,000 Windows devices worldwide from March 16 to May 16. The malware,

The messages seemed innocuous, mundane even. Someone posing as a prospective guest emailed a hotel questions about a purported comment left on Booking.com. Another message was supposedly from that third-party booking site to review negative guest feedback.