The Justice Department and FBI announced court-authorized domain seizures today to deny malicious cyber actors access to two complementary hacking platforms known as “QScan” and “QTRouter,” used to target U.S. critical infrastructure and other sensitive networks. As described in court documents unsealed in the Southern District of California, a People’s Republic of China (PRC) state-sponsored group known as “QTFY,” employed by China-based Nanjing Xinjiuwei Network Technology Company (南京鑫玖维网络科技有限公司), created and operated QScan and QTRouter. Among the victims of QTFY computer intrusion activity are the National Aeronautics and Space Administration, Federal Reserve, Department of Energy, Department of Justice, Department of Health and Human Services, National Institutes of Health, and the U.S. Senate.
“State-sponsored malicious hackers preying on America’s critical infrastructure will be stopped and prosecuted. We are here to ensure security for the American people and will use every tool we have to keep that promise,” said Attorney General Todd Blanche. “Federal law enforcement investigated and disabled the PRC’s malicious software, the latest in a series of technical operations to dismantle indiscriminate hacking activities sponsored by the People’s Republic of China.”
“Today we announced the disruption of a global botnet and hacking platform used by Chinese state-sponsored hackers to target U.S. critical infrastructure,” said FBI Director Kash Patel. “These tools were used by PRC cyber actors to hide the origin of their attacks. Thanks to the work of FBI San Diego, FBI Cyber Division, and DOJ partners, we seized adversary infrastructure and shut these platforms down. Today’s action is just the latest technical operation against PRC-sponsored hacking - and in support of President Trump’s Cyber Strategy for America, the FBI is surging efforts to shape adversary behavior and defend the homeland in cyberspace.”
“Today’s announcement demonstrates the Justice Department’s steadfast commitment to going on the offensive against cyber threats to the national security,” said Assistant Attorney General for National Security John A. Eisenberg. “These court-authorized seizures deny PRC-linked hackers access to tools they use to mount online attacks against our Nation’s critical infrastructure.”
“We’re taking the fight to PRC sponsored cybercriminals to protect the critical services Americans rely on every day,” said U.S. Attorney Adam Gordon for the Southern District of California.
“The FBI remains relentless in our efforts to counter nation state cyber actors, taking decisive action against those threatening the United States and our critical infrastructure,” said Special Agent in Charge Mark Remily of the FBI San Diego Field Office. “Through complex investigations, aggressive technical operations, and strong partnerships, FBI San Diego will continue to identify, disrupt, and impose costs on our cyber adversaries. We are committed to dismantling the tools behind these state-sponsored crimes and protecting the American people from malicious cyber activity.”
According to court documents, QTFY offers computer hacking services to its paying customers, including the PRC’s Ministry of State Security and the People’s Liberation Army. These computer hacking services include QScan and QTRouter, which work in conjunction. QScan scans and automatically infects thousands of “internet-of-things” (IoT) devices worldwide, which are then added to the QTRouter network of QTFY-controlled devices. QTRouter consists of these compromised IoT devices, as well as commercial proxy service devices and leased virtual private servers. QTRouter then serves as an “obfuscation network” – meaning it allows QTFY and other malicious cyber actors to conceal the PRC-origin of their computer intrusion activities because the malicious communications appear to originate from computers (such as those compromised by QScan) that are outside of the PRC and may even be local to the targeted networks. Because the seized domains were hard-coded into both the QScan and QTRouter malware and used for essential tasks such as communication and authentication, the court-authorized seizures made QScan and QTRouter inoperable.
This disruption announced today is among a series of court-authorized technical operations against indiscriminate hacking activities by the PRC. In 2025, the FBI removed PlugX surveillance malware from over 4,000 U.S. computers after they had been infected by the PRC-sponsored hacker group Mustang Panda. In 2024, the FBI disabled a botnet consisting of hundreds of thousands of infected internet-of-things devices, which the PRC-sponsored hacking group Flax Typhoon was providing to customers in the Chinese government. In 2023, the FBI disrupted a different botnet used by the PRC-sponsored hacking group Volt Typhoon to conceal their exploitation of U.S. and foreign critical infrastructure. Also today, the FBI and National Security Agency published a cybersecurity advisory providing indicators-of-compromise by QTFY based on their analysis of QTFY malicious cyber activity dating back to at least 2018. In addition, Lumen Technologies’ threat intelligence group, Black Lotus Labs, published a description of QTFY’s tactics, techniques, and procedures: www.lumen.com/blog/en-us/the-infrastructure-quartermaster-inside-a-china-nexus-state-enablement-model.
The FBI’s San Diego Field Office and Cyber Division, the U.S. Attorney’s Office for the Southern District of California, and the National Security Cyber Section of the Justice Department’s National Security Division investigated this hacking activity and led this disruption effort.
