It may sound surprising, but yes-hackers can use sound waves to steal data in certain situations. This technique is not very common in everyday attacks, but researchers and advanced threat actors have shown that it is possible.
This type of attack is known as an acoustic or ultrasonic attack. It works by using sound waves, often beyond human hearing (ultrasound), to transmit or capture information between devices. Since these signals are silent to humans, users may not even realize anything unusual is happening.
One method involves using a device’s microphone to capture sound-based signals. Malware installed on a system can listen for specific frequencies and convert them into usable data. For example, two infected devices can communicate with each other using sound waves, even without an internet connection.
Another approach uses speakers to send hidden commands or data. In some cases, attackers have demonstrated that voice assistants can be triggered using ultrasonic frequencies, causing them to perform actions without the user’s knowledge.
Air-gapped systems (computers not connected to the internet) are also potential targets. Researchers have shown that data can be transmitted from such systems using sound waves generated by speakers or even internal components like hard drives.
However, these attacks require specific conditions. The attacker usually needs prior access to the device (such as installing malware), and the devices must have working microphones or speakers. This makes such attacks more complex compared to common methods like phishing or malware.
To stay safe, users should limit app permissions for microphone access, avoid installing unknown software, and keep devices updated. Disabling unused audio features can also reduce risk.
While sound wave attacks are not widespread, they highlight how creative and advanced cyber threats can become.
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