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Lumma Stealer Malware Compromises 400,000 Computers

First seen 30 Dec 2025, 18:25 UTC • •

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ThreatCluster AI
ThreatCluster •March 12, 2026 at 13:27 UTC

Lumma Stealer, an infostealer malware, was found on nearly 400,000 computers, stealing personal credentials such as passwords, credit card numbers, and cryptocurrency wallet logins. A joint effort by Microsoft and law enforcement led to its shutdown, although the damage caused by Lumma has likely already occurred. The malware has been prevalent among cybercriminals for years.

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