Is it possible for a malicious program to use the computer's microphone to record sound in a background process, without showing any easily noticeable symptoms? I think that many laptops probably have an internal microphone. Could a malicious program install itself to a computer and record sound while the computer is turned on but idle? What is the likelihood that such a program would be installed by a PC manufacturer as bundleware? Is there any way to detect and remove such a program from the computer if it exists?