In a novel maneuver for a disruption operation against cyber attackers, industry and law enforcement teamed up to conduct a court takedown of two widely-used criminal tools at once rather than individually, Microsoft said Tuesday.

The takedown simultaneously went after Amadey, a botnet that can serve as a malware delivery system, and StealC, an infostealer. Cybercriminals often use them in conjunction and they rely on the same infrastructure, Microsoft said.

“When multiple parts of an operation are disrupted together, attacks are harder to launch, scale, and recover from,” said Steven Masada, assistant general counsel for Microsoft’s Digital Crimes Unit. “The result: fewer disrupted services, fewer opportunities for cybercriminals to profit, and more friction when they try to rebuild. It’s no longer enough to go after threats one by one. We need to interrupt how the attacks are put together.”

Microsoft had been tracking Amadey with ESET, BitSight, Lumen and Mitsui Bussan Secure Directions. Meanwhile, Europol had been investigating StealC alongside law enforcement partners including Germany’s Federal Criminal Police Office and the Dutch and Danish National Police as well as IBM X-Force and Proofpoint.

They then joined forces and turned to the Racketeer Influenced and Corrupt Organizations (RICO) Act, used to help authorities go after organized crime, to disrupt more than 200 command-and-control servers. Microsoft said it gained insights from its artificial intelligence product Copilot that “allowed the legal team to treat both malware families as part of a single criminal conspiracy.”

Microsoft regularly leads court-authorized disruption operations, but the industry and law enforcement partnerships combined with AI to expand data collection and identify connections beyond what one company could normally do, it said.

Amadey and StealC were linked to more than 140,000 infected computers around the globe in the first week of May alone, the company said. StealC has ranked among the top infostealers for years since its emergence in 2023 and sells in underground forums as a malware-as-a-service. It’s typically used by Russia-linked groups.

Amadey dates back to 2018, and is also commonly employed by Russian groups, including in attacks on Ukraine.

Their interaction shows the assembly line-like structure of modern cybercrime, Microsoft said. Even if the cybercriminals behind both tools never coordinate, their tools are designed to work together, it said.

“StealC is an infostealer that collects sensitive data from browsers, cryptocurrency wallets, messaging applications, email clients, and gaming platforms,” the company wrote in a separate blog post. “It is a malware-as-a-service (MaaS) offering that threat actors use to generate customized payloads and manage stolen data through a centralized web panel. Meanwhile, Amadey is a MaaS loader that threat actors use to deliver StealC and other malware. Modular, pay-as-you-go models like StealC and Amadey allow threat actors to use a single initial infection to quickly escalate into multiple other threats.”

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Meta said Monday that it caught a spearphishing campaign linked to spyware maker NSO Group despite a court injunction, prompting the tech giant to file a contempt-of-court complaint.

The company won a civil case last year against NSO Group barring it from targeting WhatsApp users and securing $168 million in damages, although NSO Group has been appealing the ruling.

But Meta says NSO Group, makers of the Pegasus spyware, isn’t honoring the permanent injunction.

“We successfully disrupted NSO-linked social engineering attempts, after investigating user reports,” it said in a blog post. “They tried to trick people into clicking on malicious links to drive them to external websites outside of WhatsApp, similar to previously reported 1-click phishing campaigns linked to NSO. We also caught them creating test accounts and groups on WhatsApp, which we took down.”

Meta said the campaign resembled spyware infections that hit journalists and activists in Jordan from 2019 to 2023.

NSO Group didn’t respond to requests for comment about Meta’s accusations.

One top researcher who tracks spyware said NSO Group’s actions are an argument for keeping them on the U.S. sanctions “entity” list that the company has fought to be removed from since its designation in 2021.

“NSO’s own actions make the strongest argument for why they should stay on the Entity list,” John Scott-Railton, senior researcher at the University of Toronto’s Citizen Lab, wrote on social media. “And reaffirm that the decision to put them there was the right one.”

Meta made the same argument.

“When a malicious company on the US government’s Entity List continues to defy US courts, existing restrictions must remain firmly in place,” it said in its blog post. “Easing them would undermine US national security and put American companies and billions of people worldwide who depend on secure communications at risk.”

Lawmakers have sought information on the federal government’s prospective use of NSO Group tech and other kinds of spyware, despite a blacklist, given close ties between the company’s new executive chairman and President Donald Trump.

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