Targeted ads delivered 0-click exploits to install mercenary malware - Ars Technica

Researchers say that mercenary hackers laced ads with zero-click exploits that installed sophisticated malware on the devices of targeted individuals when they did nothing other than load a website or open an installed app.

The finding, published Thursday by the University of Toronto’s Citizen Lab, said the incident is likely to be the first confirmation of zero-click mercenary spyware delivered through targeted ads. The attacks, which worked on iOS and Android devices, are particularly pernicious because they work without requiring any interaction from the target and are invisible unless users run special forensic hardware or software. Citizen Lab said it confirmed that AdFection, as it named the campaign, infected 45 devices at international media organization Al Jazeera in 2024 and 2025.

“This investigation should… serve as a clear warning signal to news organizations around the world that they may be being actively targeted via this new threat,” Citizen Lab researchers wrote. “This targeting may happen both in newsrooms and to individual journalists, editors, and other staff members.” Their report went on to say: “The distribution of spyware via targeted ads represents a security risk not only for potential victims but also for states and civil society at large.”

Google and IAB Europe have since removed Discover-Tech from their ad vendor registries, and Google further terminated Discover-Tech’s access to its ad exchange platforms. Beeswax has removed Discover-Tech from its ad buying platform. Fellow ad platform Vungle (Liftoff) paused Discover-Tech’s access while conducting a review, and Eskimi blocked Discover-Tech’s accounts and domains.

Thursday’s report said that Discover-Tech ad impressions have appeared on government and national-security-linked networks throughout the world: NATO, United Nations networks, European lawmaking bodies, critical infrastructure providers in Australia, and armed forces and government agencies in Norway and Sweden.

The research lab said that the mercenary malware installed through AdFection was developed and distributed by Candiru (rebranded as “Integrity Labs”). Under the arrangement with Discover-Tech, targets with specific profiles of interest to the Candiru customers received ads that carried JavaScript or other code that connected to Candiru’s control servers. In response, those servers delivered an exploit that served the zero-click payload when the ad appeared on an individual’s device.

The research doesn’t describe the vulnerabilities exploited in the zero-click attacks or the final malware that was installed in them. It’s likely they were zero-days that have been fixed after Citizen Lab discovered the campaign. Citizen Lab didn’t immediately respond to questions.

Messages sent to Discover-Tech and Candiru went unanswered.

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5. Targeted ads delivered 0-click exploits to install mercenary malware