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The FBI on Wednesday said it disrupted a botnet and seized two platforms that Chinese-government cyberoperatives used to hack NASA, the US Senate, the Department of Energy, and several other government agencies and critical networks. The Federal Reserve, Department of Justice, Department of Health and Human Services, and the National Institutes of Health were also among those victimized by the two now-seized hacking tools: a vulnerability scanning and exploitation malware named QScan, and an obfuscation network named QTRouter. The FBI says a People’s Republic (PRC) of China-backed group called QTFY created and operated the two platforms, plus botnets of compromised IoT devices. The Bureau says QTFY’s hackers work for a private PRC company called Nanjing Xinjiuwei. “Payments from the PRC's Ministry of State Security (MSS) to Nanjing Xinjiuwei, for example, indicate that the company conducts malicious cyber activities on behalf of the PRC Government,” according to court documents. “QTFY actors include former members of the PRC's People's Liberation Army (PLA), and they use their PLA relationships to obtain contracts and subcontracts supporting offensive cyber operations,” the documents state. How to build a botnet QScan scans and automatically infects thousands of IoT devices worldwide, and then adds them to the QTRouter network of QTFY-controlled devices. The QTRouter botnet – consisting of these compromised IoT devices, plus commercial proxy service devices, and leased virtual private servers – then serves as an obfuscation network, allowing QTFY and other criminals who pay for the service to conceal the origin of their digital intrusion activities, making these communications appear to originate from local computers. On Monday, a US federal court granted seizure warrants for three domains linked to QTFY: qtproxy.xyz, qt-proxy.org, and qt-team.com. All three domains were hardcoded into both the QScan and QTRouter malware, and the court-authorized seizures made both hacking services inoperable, the Justice Department said. Hacking critical networks since 2018 (at least) The hacking services and malware have been in use since at least 2018, and as recently as this year when QTFY infrastructure compromised the US Senate, according to court documents. The FBI investigated an attempted computer intrusion at NASA in August 2019, during which the Chinese government snoops tried to exploit CVE-2019-11510, a critical vulnerability in Ivanti’s Pulse Secure VPN that allowed attackers to learn legitimate users' usernames and passwords, effectively granting them unauthorized access to protected networks. Ivanti patched the flaw in April 2019. As The Register previously reported, China also abused this bug as a zero-day to break into dozens of defense companies, government agencies, and financial organizations in America and abroad. QTFY later exploited this same CVE in 2020 during the COVID-19 pandemic to attack a medical center in Ohio, according to court documents. Other victims in 2019 and 2020 include unnamed financial groups in Michigan and South Korea, and a Missouri insurance agency. The insurance agency attack abused a different vulnerability: CVE-2019-19781, a critical flaw in Citrix VPN products that allowed arbitrary code execution with no account credentials. Years later, in 2024, QTFY hackers also broke into computers at three DOE National Laboratories, NIH, and a US security device manufacturer. “These entities were victims of a zero-day attack against Ivanti Cloud Services Appliance,” the court documents say. The FBI did not respond to The Register’s inquiries, including how many computers QTFY compromised, and whether the crew has ties to any of China’s "Typhoon" groups. PRC goon squad whac-a-mole This latest disruption follows a series of court-ordered seizures intended to hamstring China’s hacking activities over the last few years. In 2025, the FBI removed PlugX surveillance malware from more than 4,000 US computers that had been infected by the PRC-sponsored group Mustang Panda. A year earlier, in 2024, China’s Flax Typhoon burned down their own botnet consisting of hundreds of thousands of infected internet-of-things devices when confronted by the feds. And in late 2023, the FBI disrupted a botnet used by yet another Chinese government attack crew, Volt Typhoon, to attack US and foreign critical infrastructure. In June, however, Lumen’s Black Lotus Labs reported a “significant resurgence” of a botnet linked to Volt Typhoon, with this cluster of injected machines surging to 1,500 compromised routers and IoT devices.®