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Microsoft files legal action against information-stealing malware Lumma Stealer

Published by Global Banking & Finance Review

Posted on May 21, 2025

1 min read

· Last updated: January 23, 2026

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Microsoft files legal action against information-stealing malware Lumma Stealer
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(Reuters) -Microsoft said on Wednesday its Digital Crimes Unit (DCU) filed a legal action against Lumma Stealer last week, after it found nearly 400,000 Windows computers globally infected by the

Microsoft files legal action against information-stealing malware Lumma Stealer

(Reuters) -Microsoft said on Wednesday its Digital Crimes Unit (DCU) filed a legal action against Lumma Stealer last week, after it found nearly 400,000 Windows computers globally infected by the information-stealing malware in the past two months.

Lumma is capable of stealing data from various browsers and applications, such as cryptocurrency wallets, and installing other malware, the company said in a blog.

Microsoft's DCU helped in the "takedown, suspension, and blocking of malicious domains that formed the backbone of Lumma's infrastructure," via a court order from the U.S. District Court of the Northern District of Georgia, the blog said.

The U.S. Department of Justice seized the central command structure for Lumma and disrupted marketplaces where the tool was sold to cybercriminals.

"The growth and resilience of Lumma Stealer highlight the broader evolution of cybercrime and underscores the need for layered defenses and industry collaboration to counter threats," Microsoft said in a separate blog post on the malware.

(Reporting by Juby Babu in Mexico City; Editing by Alan Barona)

Key Takeaways

  • Microsoft filed legal action against Lumma Stealer malware.
  • Nearly 400,000 Windows computers were infected globally.
  • Lumma Stealer can steal data from browsers and apps.
  • The U.S. Department of Justice disrupted Lumma's operations.
  • Microsoft emphasizes the need for industry collaboration.

Frequently Asked Questions

What legal action did Microsoft take against Lumma Stealer?
Microsoft's Digital Crimes Unit filed a legal action against Lumma Stealer after discovering nearly 400,000 infected Windows computers worldwide.
What capabilities does Lumma Stealer have?
Lumma Stealer can steal data from various browsers and applications, including cryptocurrency wallets, and can also install additional malware.
What actions did the U.S. Department of Justice take regarding Lumma?
The U.S. Department of Justice seized Lumma's central command structure and disrupted marketplaces where the malware was sold to cybercriminals.
What does Microsoft say about the evolution of cybercrime?
Microsoft stated that the growth and resilience of Lumma Stealer highlight the broader evolution of cybercrime and emphasize the need for layered defenses and industry collaboration.
How did Microsoft's DCU contribute to the takedown of Lumma?
Microsoft's Digital Crimes Unit assisted in the takedown, suspension, and blocking of malicious domains that were integral to Lumma's infrastructure through a court order.

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