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HP is selling more than two dozen models of laptops and tablets that covertly monitor every keystroke a user makes, security researchers warned Thursday. The devices then store the key presses in an unencrypted file on the hard drive.
The keylogger is included in a device driver developed by Conexant, a manufacturer of audio chips that are included in the vulnerable HP devices. That's according to an advisory published by modzero, a Switzerland-based security consulting firm. One of the device driver components is MicTray64.exe, an executable file that allows the driver to respond when a user presses special keys. It turns out that the file sends all keystrokes to a debugging interface or writes them to a log file available on the computer's C drive.
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The log file—located at C:\Users\Public\MicTray.log—is overwritten after each computer reboot, but there are several ways that the contents could survive for weeks, or even indefinitely.
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Affected HP models included HP EliteBooks, HP ProBooks, HP ZBooks, and HP Elites. People can check to see if their HP computer is at risk by searching for the files C:\Windows\System32\MicTray.exe or C:\Windows\System32\MicTray64.exe. Modzero said PCs sold by other manufacturers that contain Conexant drivers may be similarly at risk. Neither HP nor Conexant responded to requests to comment for this post.
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Modzero said that people who own an affected computer can delete or rename the C:\Windows\System32\MicTray.exe or C:\Windows\System32\MicTray64.exe files (and the log file according to another article at pcgamer), although that move may cause special function keys for audio to stop working. There is no indication that either HP or Conexant has released an update.