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.

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.