Microsoft Corporation's Digital Crimes Unit (DCU) announced on Wednesday that it partnered with international authorities to dismantle an info-stealing malware tool used by hackers.

The company stated in an announcement that it filed a legal action against "Lumma Stealer" on May 13. Furthermore, per court order granted by the United States District Court of the Northern District of Georgia, Microsoft said it was able to disrupt and block "approximately 2,300 malicious domains" of Lumma's infrastructure.

"Between March 16, 2025, and May 16, 2025, Microsoft identified over 394,000 Windows computers globally infected by the Lumma malware. Working with law enforcement and industry partners, we have severed communications between the malicious tool and victims. Moreover, more than 1,300 domains seized by or transferred to Microsoft, including 300 domains actioned by law enforcement with the support of Europol, will be redirected to Microsoft sinkholes," the tech giant said in a post.