Citizen Lab says governments are abusing online ads to hack people with ‘zero-click’ spyware

The digital rights unit found evidence that dozens of devices at media organization Al Jazeera were hacked after being shown malicious online ads. Security researchers at digital rights unit The Citizen Lab say government spyware makers are abusing global advertising networks to target and hack devices by serving malicious online adverts. A new report published Thursday by the University of Toronto lab, which investigates surveillance and digital rights abuses, said an Israeli company called Discover-Tech allows spyware makers to use its advertising platform to target specific people or devices almost anywhere in the world with spyware capable of invisibly stealing their data. The researchers say Discover-Tech presents itself as a legitimate advertising firm, but instead serves as a “bridge between ad vendors and the mercenary spyware ecosystem.” Citizen Lab said at least two makers of zero-click spyware, Candiru and Bindecy, used Discover-Tech’s platform to target people.

Both of these spyware makers provide surveillance products that can infect devices without the victim having to open a message or click on a link. The researchers found that one attack affected at least 45 Windows computers at media organization Al Jazeera. The devices were apparently hacked in 2024 and 2025 via Candiru’s spyware after being exposed to online ads packed with malicious code. Citizen Lab said it wasn’t clear which governments were behind