Citizen Lab says it has documented the first publicly confirmed case of zero-click mercenary spyware being delivered through targeted online ads, a technique it calls "AdFection." "There has been a lot of buzz that online ads can be used to identify and automatically hack targets with pinpoint precision, but now for the first time, we have concrete technical evidence showing this process in action," said Bill Marczak, a researcher at Citizen Lab. The Guardian reports: Citizen Lab, a digital investigations research unit at the University of Toronto, said it believed dozens of devices at the Qatari broadcaster Al Jazeera had been compromised by spyware delivered through ads run by Discover-Tech, which describes itself as a specialised digital advertising agency. According to Citizen Lab, Discover-Tech operates a software platform called Controlium that allows its clients to "mass-profile and deanonymize" internet users then covertly hack targets with third-party spyware. Unlike infections that rely on people interacting with links or files, the spyware requires no interaction from the victim to be installed, making it a new delivery technique, Citizen Lab says. The infections happen without a user's knowledge, and in a matter of seconds, according to Citizen Lab.

"[The online advertising] ecosystem is being weaponized at a massive scale to profile millions of users, then silently infect targets with zero-click mercenary spyware," the report says. According to the report, Controlium is able to harvest a user's identity and IP address when the user is shown a seemingly benign custom-created ad -- for example, for a digital game or a telecoms service. If the user has been selected as a target for hacking, a mercenary spyware firm can then send a malicious code containing spyware to their device, the researchers say. They say that millions of users worldwide have been served ads by Discover-Tech since 2024, including in Yemen, Brazil, Mexico and Czechia. [...] The full extent of the targeting allegedly enabled by Discover-Tech is unknown. Citizen Lab's findings join mounting evidence that the opaque arrangements underpinning the world of online advertising can be leveraged for surveillance.

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