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Before two of its alleged members were arrested and charged in Australia last month, the hacker group known as TeamPCP carried out a hacking spree unlike any other in history.

Google’s threat intelligence group said it had a mole inside TeamPCP’s inner circle.

Now Google’s threat intelligence group has revealed that during a key moment of TeamPCP’s rampage, the company’s own undercover researcher had infiltrated the group—allowing Google to monitor the hacking spree from the inside, warn breach targets, and even help disrupt the group’s attempts to exploit those victims.

In a talk at security firm SentinelOne’s LABScon research conference today, Google Threat Intelligence Group researcher Austin Larsen will present details on the company’s investigation—and infiltration—of TeamPCP amidst the group’s unprecedented, chaotic supply-chain hacking campaign. According to Larsen, Google eventually followed a trail of operational security mistakes allegedly made by one of the two Australians now accused of being leading members of the hacker group and passed on key identifying details to law enforcement. The company also received intelligence from ShinyHunters, another infamous cybercriminal group that TeamPCP partnered with, but which later turned on the supply-chain hackers. And perhaps most surprisingly, Larsen says that Google’s security subsidiary Mandiant had an undercover analyst—not himself—within the group’s inner circle from almost the beginning of TeamPCP’s time in the spotlight.

“One of our personas had been working for many months to build trust with one of the actors that was invited to join TeamPCP, and so was added to the group,” Larsen told WIRED in an interview ahead of his LABScon talk. “So essentially, almost day one, Mandiant was watching everything behind the scenes.”

Late last month, Ruben Ian Thomson and Louis Michael Gaebler, both Australians in their early 20s, were arrested by Australian police in a joint investigation with assistance from the FBI, charged with hacking crimes, and described by the Australian Federal Police (AFP)—in a press release that, due to Australian privacy laws, did not name them—as “principal participants” in TeamPCP. The hacker group, which seems to have first appeared online in late 2025, had made headlines with a brazen string of cascading supply-chain attacks : It repeatedly compromised open-source software to hide its malware, which then allowed it to hijack the credentials of software developers and plant its malicious code in yet another widely used tool, in a repeating cycle.