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

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.

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.

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.

Microsoft has teamed up with law enforcement agencies across the globe to disrupt the infrastructure behind one of the world’s most notorious infostealer operations. Microsoft said that, between March 16 and May 16, it identified over 394,000 Windows computers globally that were infected with Lumma Stealer malware.

Microsoft announced a coordinated effort to hobble Lumma Stealer, a widely used piece of malware known for stealing personal information and enabling ransomware attacks. The company on Wednesday said it… Read More

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