Virtual assistants like Siri, Google Assistant, Alexa etc. are said to be vulnerable to a new attack through which hackers could easily hack your device.
Dolphins inspire scientists
The method, dubbed DolphinAttack, takes advantage of the fact that human ears are useless when confronted with sounds well above 20 kHz. So the team added an amplifier, ultrasonic transducer and battery to an ordinary smartphone (total cost in pieces was around $3) and used it to send ultrasonic commands to voice-activated systems.
Source: Siri, Google Assistant, Alexa Said To Be Vulnerable To This New Attack