Two men from Western Australia were arrested and charged Wednesday for their alleged roles in TeamPCP, a notorious cybercrime group responsible for inserting malicious code into widely used open-source software in a campaign that compromised more than 1,000 organizations worldwide.

Australian authorities did not formally name the men, but Australian media identified them as Ruben Ian Thomson, 21, and Louis Michael Gaebler, 23. Police arrested both after searching properties, seizing electronic devices for forensic testing in the process. 

Thomson faces eight charges, including four counts of unauthorized data modification, dealing in criminal proceeds worth $100,000 or more, and refusal to comply with an order to hand over device passwords. Gaebler faces six related counts. 

The Australian Federal Police, which worked with the Western Australia Police Force (WAPF) and the Federal Bureau of Investigation, allege both men were part of a syndicate engaged in “data intrusion, identity crime and cryptocurrency-based money laundering.” Investigators said further arrests have not been ruled out.

“These men are allegedly members of the cybercriminal group TeamPCP, whose malicious code potentially compromised more than a thousand organizations worldwide,” said Brett Leatherman, assistant director of the FBI’s Cyber Division. “We are proud to work with the Australian Federal Police and the Western Australia Police Force to impose cost on criminal actors and combat the growing threat of software supply-chain attacks.”

Months of havoc

TeamPCP has been one of the most active cybercriminal groups in 2026. In late February, TeamPCP exploited a misconfigured workflow in Trivy, Aqua Security’s widely used vulnerability scanner, and stole a service-account token. Aqua replaced its credentials but missed some.

On March 19, the group pushed a malicious Trivy release through every distribution channel at once, placing malware inside thousands of automated build pipelines. Downstream victims included the European Commission and GitHub.

Investigators estimate the campaign exposed more than 500,000 credentials, removed at least 300 gigabytes of data and produced global cleanup costs in the hundreds of millions of dollars.

In May, a piece of self-replicating malware known as “mini Shai-Hulud” targeted prominent software libraries, including TanStack, UiPath, and MistralAI, embedding credential-stealing code into development tools downloaded millions of times a week.

Earlier this month, Oligo Security shared exclusive research with CyberScoop that dated the group’s attacks as far back as 2020. 

Cat photos and GitHub accounts

Alongside the arrests, researchers at the Canadian threat intelligence firm Flare published research that traced Ruben Thomson’s online presence. 

Working from a GitHub alias, DeadCatx3, the researchers found a bug-bounty account under the name Ruben Thomson and a profile listing masscan[.]cloud, a domain that served as command server for mini Shai-Hulud. From there, a password tied to a school email address led researchers to databases of stolen credentials and a trove of accounts: a personal Google account, a TikTok profile under Thomson’s name, and a Steam gaming page showing a cat seated before several monitors. The cat image appeared on a TeamPCP Telegram identity. Flare assessed with high confidence that Thomson ran the group and said it confirmed the findings with law enforcement.

Charlie Eriksen, lead malware researcher at Aikido Security, called the arrests a “relief,” but warned that the actions won’t mean the threat toward open-source software suddenly vanishes.

“The conditions that produced them haven’t gone away, so there will be another TeamPCP,” he told CyberScoop in an email. “We just don’t know their name yet.”

The two men will appear in Australian court Thursday. 

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In less than four hours early Tuesday, an attacker compromised a GitHub maintainer account and unleashed a self-replicating piece of malware which injected malicious code into more than 440 distinct npm packages, according to multiple security firms. 

The worm, built on the open-source Mini Shai-Hulud repository that TeamPCP published in May, was initially let loose in keyv, a data management interface software package with more than 600 million monthly downloads. The attacker spent the next 30 minutes compromising additional packages controlled by the same maintainer, including cacheable, flat-cache, file-entry-cache.

The attack spread to other maintainers, eventually compromising more than 860 packages with a “combined total of over 2 billion monthly installs,” Ilyas Makari, malware researcher at Aikido Security, wrote in a blog post. 

Wiz researchers told CyberScoop it hasn’t observed any new malicious packages since the initial wave moved through a massive footpoint of cloud and code environments in those first four hours. 

“This is the most critical initial compromise, with over 155 million weekly downloads on the root packages,” Wiz Research said in an email. 

Some of the compromised packages, including keyv, flat-cache and file-entry-cache, are present in more than 46% of all cloud environments, according to Wiz. “By comparison, back in the Shai-Hulud 2.0 campaign the most prevalent packages were only in about 28% of environments,” the company said. 

“Time will tell whether the eventual cost and impact outpaces past attacks, or whether adoption of hardening mechanisms such as package aging, and the usage of the relatively less aggressive Mini Shai-Hulud code as basis, will defray the final toll here,” Wiz Research added. 

Researchers from multiple firms sprung into action to monitor the widening attack spree and published indicators of compromise to help potential victims hunt for malicious activity in their systems. 

The Mini Shai-Hulud variant used in these attacks scoops up a trove of sensitive data, including npm, GitHub, AWS and continuous integration credentials. It also steals AI-related configuration files and cryptocurrency wallets, researchers said. 

Microsoft, Aikido, Socket and Wiz all said the same payload and pattern was observed across all affected packages, indicating a single attacker or threat cluster was behind the supply-chain attack and using multiple stolen tokens. 

The malware showcased a few pieces of new functionality, but retained the same core mechanisms that are hallmarks of Mini Shai-Hulud. 

“The evolution is consistent with what we’ve seen from them in past waves, however we don’t yet have the hard links” to confidently attribute the attacks to TeamPCP, Wiz Research said.

The notorious threat actor, which Google previously told CyberScoop it attributes to one core operator that was located in South Africa during at least some of the attacks, compromised and injected malicious code into more than 1,000 software packages in less than four months earlier this year.

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