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(From the article)
The infection can travel both from computer to USB and vice versa. Any time a USB stick is plugged into a computer, its firmware could be reprogrammed by malware on that PC, with no easy way for the USB device’s owner to detect it.
he malware they created, called BadUSB, can be installed on a USB device to completely take over a PC, invisibly alter files installed from the memory stick, or even redirect the user’s internet traffic. Because BadUSB resides not in the flash memory storage of USB devices, but in the firmware that controls their basic functions, the attack code can remain hidden long after the contents of the device’s memory would appear to the average user to be deleted. And the two researchers say there’s no easy fix: The kind of compromise they’re demonstrating is nearly impossible to counter without banning the sharing of USB devices or filling your port with superglue.
“These problems can’t be patched,” says Nohl,
‘IN THIS NEW WAY OF THINKING, YOU HAVE TO CONSIDER A USB INFECTED AND THROW IT AWAY AS SOON AS IT TOUCHES A NON-TRUSTED COMPUTER.’
It can even impersonate a USB keyboard to suddenly start typing commands. “It can do whatever you can do with a keyboard, which is basically everything a computer does,” says Nohl.
The malware can silently hijack internet traffic too, changing a computer’s DNS settings to siphon traffic to any servers it pleases. Or if the code is planted on a phone or another device with an internet connection, it can act as a man-in-the-middle, secretly spying on communications as it relays them from the victim’s machine.
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