Did dolphins really need to be brought into cybersecurity debate?
Regardless of what technique hackers use (ultrasonic in this instance) to compromise user's handsets, private and public sector organisations need to stop focussing on the device and focus on the user's behaviour.
Monitoring for changes in behaviour might be a better strategy than simply assuming the device is being used by the rightful user.
Voice control is all the rage these days, but a team of Chinese researchers has come up with a way to subvert such systems by taking a trick from the natural world. Apps like Google Assistant and Siri are set to always be listening and ready for action, but shouting into someone else's phone is hardly subtle. So the team from Zhejiang University decided to take a standard voice command, convert it into the ultrasonic range so humans can't hear it, and see if the device could.