Suspected Chinese hackers with a proven knack for exploiting zero-days in security products are at it again, targeting BeyondTrust customers in attacks that researchers have traced back to late August. 

Mandiant researchers said a likely Chinese government-backed espionage group it previously tracked as UNC5221, and now calls Armory Castle, exploited the critical defect — CVE-2026-102764 — then showcased multiple tactics to escalate privileges, hop around the compromised network and evade detection. 

The same threat group has repeatedly exploited a series of defects in Ivanti products since 2023, a Citrix NetScaler zero-day widely known as CitrixBleed, and last year’s Brickstorm campaign that had an average dwell time of 400 days — all resulting in sweeping attack sprees.

“We are aware of only a small number of impacted organizations at this time, but given the stealth of the activity, and the use of a zero-day, it is possible that additional organizations were also compromised prior to the disclosure,” Kelli Vanderlee, senior analyst at Google Threat Intelligence Group, said in an email.

Mandiant warned organizations to “prepare for potential widespread exploitation,” adding that Armory Castle and other threat groups previously conducted broad, opportunistic exploitation following public vulnerability disclosures.

Mandiant and GTIG released their analysis of Armory Castle and its latest campaign as BeyondTrust publicly disclosed the vulnerability in its Remote Support product Thursday. The company’s security said it released a patch for the exploited defect for self-hosted customers Oct. 8 and automatically applied the update to cloud-based versions of the product that same day.

BeyondTrust, which conducted its own investigation and coordinated with Mandiant on an investigation involving a self-hosted customer that was compromised, noted Armory Castle’s prowess.

“This threat actor rotates its infrastructure and tooling for every victim, so attribution here rests on behavior. The indicators from one intrusion rarely survive to the next,” the company’s security team wrote in a blog post. “The threat actor has historically demonstrated a high degree of operational security awareness, professional practices, and tradecraft.”

A BeyondTrust spokesperson declined to answer questions about how many customers are already compromised or why it didn’t publicly disclose the actively exploited zero-day sooner, and instead referred back to its security advisory. 

The company said the first known instance of zero-day exploitation occurred Aug. 29, which it detected and contained Sept. 28. 

BeyondTrust also said it detected the malicious activity after zero-days were confirmed to be exploited in another security vendor’s product Sept. 27. That timing matches a round of zero-days Citrix NetScaler disclosed, following nearly two days of rampant worry and unconfirmed rumors. 

BeyondTrust did not say if there is any link or overlap between the attacks targeting Citrix NetScaler, which went undetected for more than three weeks, and its remote access product. 

GTIG researchers said there isn’t enough evidence to assess an overall targeting trend, but encouraged all potentially vulnerable organizations to apply the patch and hunt for pre-disclosure activity. 

The threat group’s previous targets include business-process outsourcers, government, legal services, technology companies and software-as-a-service providers.

“Armory Castle remains one of the most prominent China-nexus threat actors due to its persistent targeting of various edge device technologies, use of zero-day vulnerabilities for widespread exploitation across multiple industries and regions, and its continuously expanding and evolving arsenal of tools,” said Dan Perez, technical lead at GTIG.

“This is a well-established pattern for Armory Castle,” Vanderlee said. “Targeting edge devices, which typically do not support endpoint detection and response (EDR), allows the threat actor to minimize opportunities for detection and maintain stealthy, persistent access to targeted networks.”

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Federal authorities Wednesday revealed a multi-layered Chinese state-sponsored espionage operation that’s targeted and compromised U.S. critical infrastructure, including multiple federal agencies, since 2018. 

Officials seized domains and unsealed an affidavit detailing how a Chinese government-funded front company assembled a botnet and complementary systems that allowed attackers to intrude highly sensitive networks.

The FBI and Justice Department said the state-sponsored group, known as “QTFY,” has targeted and intruded the networks of the Departments of Energy, Justice, Health and Human Services, the Federal Reserve, NASA, National Institutes of Health, and, unsuccessfully in March, the Senate. 

Financial institutions, defense contractors, utility companies, telecom providers and hospitals have also been targeted by the threat group, which includes former members of China’s military, according to court records. 

Officials said QTFY also attempted, but was unsuccessful, in gaining access to a U.S. election system in June. 

The long-running operation, which officials obstructed by seizing malicious infrastructure, provided an expansive set of services. QTFY’s full hacking suite allowed attackers to scan and exploit vulnerabilities, infect IoT devices for a botnet, and conceal or reroute traffic.

QTFY’s operation was comprehensive with features that provided continuous reconnaissance capabilities and flexibilities designed for specific targets or objectives, said Ryan English, information security engineer at Lumen Technologies’ Black Lotus Labs, which aided the disruption efforts. 

Officials said they seized three domains, which cut off access to QScan and QTRouter, the group’s primary platforms. 

“Today’s announcement demonstrates the Justice Department’s steadfast commitment to going on the offensive against cyber threats to national security,” John A. Eisenberg, assistant attorney general for national security, said in a statement. “These court-authorized seizures deny People’s Republic of China-linked hackers access to tools they use to mount online attacks against our nation’s critical infrastructure.”

The FBI, National Security Agency and Cyber National Mission Force released a joint cybersecurity advisory with QTFY’s known indicators of compromise Wednesday. Officials also detailed the China-linked hacking group’s affiliations and collaborations with other state-sponsored groups.

QTFY targeted sensitive networks in the U.S. and globally by exploiting vulnerabilities in multiple vendors’ products, including Pulse Secure, Fortinet, Citrix, Microsoft, F5, Kentico CMS, Atlassian Confluence, Ivanti, Check Point, CrushFTP and BeyondTrust, officials said.

QScan, the reconnaissance and vulnerability scanning tool, included more than 200 proof-of-concept exploits, according to court records. 

“It was designed for large-scale deployment. On a single day in 2024 for example, QScan processed over two million scanning and exploit tasks,” a special agent for the FBI said in the affidavit.

The Chinese hacking collective exploited multiple Ivanti zero-day vulnerabilities in September 2024 to intrude the networks of three DOE national laboratories, NIH, an HHS agency and a U.S.-based security device manufacturer. Officials said the seized domains were all used in those attacks. 

The FBI has been investigating QTFY, which operated out of a private China-based front company, Nanjing Xinjiuwei Network Technology Company, since at least 2019. The group has been consistently active for more than eight years. 

“Discovery of these private companies building networks for China is becoming more frequent,” English said. “We’re starting to see that when they’re getting exposed, some of these have been in business a few years before they’re found.”

The takedown follows a series of technical operations aimed at dismantling China state-sponsored attackers’ infrastructure, including an operation in early 2025 that allowed officials to remove PlugX malware from thousands of U.S.-based computers.

“State-sponsored malicious hackers preying on America’s critical infrastructure will be stopped and prosecuted,” Attorney General Todd Blanche said in a statement. “We are here to ensure security for the American people and will use every tool we have to keep that promise.”

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A Russian state-sponsored threat group has been stealing sensitive data from governments and commercial organizations since July 2025 via a novel exploit in popular Linux-based enterprise software, U.S. authorities and cyber officials from more than a dozen other countries warned in a joint cybersecurity advisory Thursday.

Laundry Bear’s most recent espionage campaign involves the exploitation of a zero-day vulnerability in Zimbra Collaboration Suite that wasn’t patched until November 2025, five months after attacks were well underway, officials said. 

The exploit just requires a view — no clicks — and allows attackers to steal the previous 90 days’ worth of email, the account’s password, search history, the victim organization’s email directory, two-factor authentication tokens and other newly created passwords.

“The covert and persistent nature of this activity, along with the absence of any known financial extortion, almost certainly indicates this group’s involvement in espionage activities with Russian government backing,” officials wrote in the advisory. 

“Additionally, extensive Ukrainian targeting, prior to use against U.S. and other NATO allies, outlines an increasing trend within Russian cyber threat groups to target Ukrainian users first—both as a priority target and as a testbench for malicious cyber techniques before broader global deployment.”

The state-sponsored espionage group, also known as Void Blizzard, has compromised governments and organizations in the defense, education, energy, law enforcement, media, finance, transportation and technology sectors. 

Laundry Bear’s year-long campaign involving the exploitation of CVE-2025-66376 showcases more technical capabilities, including a custom JavaScript payload it delivers to targeted victims via phishing emails. The threat group could also likely adapt the novel data exfiltration and aggregation capability, dubbed “beehive,” to exploit other vulnerabilities, officials warned.

The defect’s medium-severity rating of 6.1 underscores the challenge defenders regularly confront in prioritizing patching schedules based on measure of severity alone.

The Russian state-supported group, which has been active since at least 2024, is still actively exploiting Zimbra Collaboration Suite instances that remain unpatched, officials said.

Authorities shared Thursday indicators of compromise, mitigation steps and urged organizations to update their vulnerable software.

“This campaign’s targeted victimology and limited exploitation capabilities likely indicate this group manually identifies and targets the victim organizations” by identifying organizations with public-facing infrastructure, officials wrote in the advisory.

Once a target is identified, Laundry Bear also likely compiles email addresses for users to target with the exploit via phishing emails. Officials did not identify specific victims or describe the volume of organizations already compromised.

The joint cybersecurity advisory was issued by the United States, Australia, Canada, New Zealand, the United Kingdom, Czech Republic, Denmark, Estonia, Finland, France, Italy, Moldova, the Netherlands, Poland, Spain and Sweden.

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