Microsoft Corp., in collaboration with international law enforcement agencies including the U.S. Department of Justice, Europol, and Japan's Cybercrime Control Center, has successfully disrupted the operations of Lumma Stealer, a notorious information-stealing malware known as LummaC2. The malware, controlled by a Russian developer named Shamel, has infected over 394,000 Windows computers globally between March 16 and May 16, 2025, and was linked to 1.7 million theft attempts, primarily targeting seed phrases of cryptocurrency wallets. The takedown involved legal actions initiated by Microsoft's Digital Crimes Unit on May 13, resulting in the seizure of over 2,300 domains that supported Lumma's infrastructure. This operation effectively dismantled the malware's ability to steal data from various browsers and applications, including cryptocurrency wallets. The effort underscores the need for continued vigilance and collaboration across the tech industry and law enforcement to combat cybercrime.