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Microsoft Says Nearly 400,000 Windows Computers Infected By Lumma Malware
- On May 21, 2025, Microsoft revealed that Lumma Stealer had compromised more than 394,000 Windows devices worldwide during the period from mid-March to mid-May.
- This outbreak followed Lumma's rise as a Russian malware-as-a-service tool sold on underground forums to steal data via phishing and impersonation campaigns.
- Authorities including Microsoft, the DOJ, Europol, and tech firms seized about 2,300 domains and disrupted Lumma's infrastructure, cutting off communication between operators and victims.
- FBI Deputy Assistant Director Brett Leatherman described Lumma as the most widespread information-stealing malware, responsible for approximately 10 million infections and resulting in credit card fraud losses amounting to $36.5 million in 2023 alone.
- Despite the disruption, experts warn Lumma operators might regroup, so coordinated efforts will continue to limit the malware’s reach and protect affected sectors worldwide.
77 Articles
77 Articles
Nearly 400,000 Infected Computers: Microsoft Dismantles a Massive Cyberattack with Russian Malware
Microsoft's Digital Crimes Unit (DCU), in coordination with the U.S. Department of Justice (DOJ) and Europol, has broken up the infrastructure of "world's most prolific" information theft malware called Lumma Stealer. Lumma Stealer is a malware that allows cybercriminals to steal passwords, bank data, credit cards, and cryptocurrency wallets. Thus, used as a 'Malware-as-a-Service', it has been responsible for global attacks, affecting "hundreds …
Global crackdown led by Microsoft shuts down Lumma Stealer malware infecting 394,000 PCs
Microsoft says its Digital Crimes Unit (DCU) successfully disrupted the server infrastructure behind Lumma Stealer, a malware-as-a-service (MaaS) operation that infected hundreds of thousands of Windows PCs. Cybercriminals worldwide used LummaC2 to steal passwords and credit cards, drain crypto wallets, disrupt critical services, and more.Read Entire Article
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