In a major crackdown on cybercrime, the U.S. Department of Justice (DOJ), in coordination with the FBI and Microsoft, has dismantled a global malware operation known as LummaC2 by seizing five internet domains used to deploy the infostealer malware. LummaC2, notorious for stealing personal and financial data such as browser history, login credentials, and cryptocurrency wallet information, had compromised at least 1.7 million systems worldwide.
The takedown occurred over three days in May 2025, with two domains seized on May 19, followed by the rapid seizure of three additional domains after the malware operators attempted to restore access. These domains acted as user panels for cybercriminals leasing or buying access to the malware, allowing them to deploy it across networks and extract stolen data.
FBI Assistant Director Bryan Vorndran said, “We took action against the most popular infostealer service available in online criminal markets. Thanks to partnerships with the private sector, we were able to disrupt the LummaC2 infrastructure and seize user panels.”
DOJ Criminal Division head Matthew R. Galeotti added, “This type of malware is used to steal personal data from millions, facilitating crimes such as fraudulent bank transfers and cryptocurrency theft.”
In a parallel move, Microsoft launched a civil legal action to take down 2,300 more domains believed to be linked to LummaC2 actors or their proxies.
Emphasising the value of collaboration, Sue J. Bai, chief of the DOJ’s National Security Division, said, “Today’s disruption is another instance where our prosecutors, agents, and private sector partners came together to protect us from the persistent cybersecurity threats targeting our country.”
The operation, led by the FBI’s Dallas Field Office and supported by several DOJ divisions, forms part of a broader U.S. strategy to counter cyber threats, including a State Department programme offering up to $10 million for information on individuals targeting U.S. critical infrastructure.
