Skip to main content

FBI finally warns private businesses about snooping KeySweeper devices

KeySweeper - covert Microsoft wireless keyboard sniffer using Arduino and nRF24L01+
The FBI’s Cyber Division is just now getting around to warning the private industry about a fake USB device charger that can log the keystrokes of certain wireless keyboards. The government is talking about KeySweeper, which was first revealed as a proof-of-concept attack platform by Samy Kamkar 15 months before the FBI’s current notification. Kamkar used a USB-based phone charger in his demonstration to show how this platform could reside anywhere and steal/decrypt keystrokes from any Microsoft-branded wireless keyboard in the vicinity.

“If placed strategically in an office or other location where individuals might use wireless devices, a malicious cyber actor could potentially harvest personally identifiable information, intellectual property, trade secrets, passwords, or other sensitive information,” the FBI warns. “Since the data is intercepted prior to reaching the CPU, security managers may not have insight into how sensitive information is being stolen.”

According to Kamkar, the fake wireless device charger can use an internal battery, allowing it to sniff and log Microsoft wireless keyboard transmissions even when its unplugged from the wall and seemingly shut off. Collected data can be stored locally on a flash-based chip too, or sent over a GSM-based cellular network like AT&T and T-Mobile. Two KeySweeper devices can even exchange information wirelessly, and there’s a web-based tool for live keystroke monitoring as well.

The sneaky KeySweeper device created by Kamkar featured a 3.3v Arduino Pro Mini microcontroller, a nRF24L01+ RF chip that communicated using GFSK over the 2.4GHz band, and an AC USB charger for converting AC power to 5v DC. Optional components include an SPI Serial Flash chip for storing keystrokes, the Adafruit FONA board for using a 2G SIM card, and a 3.7v LiPo or LiOn battery for power when disconnected from a wall outlet.

KeySweeper’s primary code resides on the microcontroller while live monitoring of wireless keyboards is enabled by way of a web-based backend. This backend provides a web interface and uses PHP and JQuery to log all keystrokes. He also modified the Adafruit FONA library that enables the FONA to detect a new text message, and created a JQuery Terminal plugin that makes keyboard monitoring easier.

Microsoft wireless keyboards use a proprietary 2.4GHz RF protocol. To figure out the actual wireless language, Kamkar ripped apart a Microsoft wireless keyboard and examined the chip responsible for its wireless connectivity. He bought the exact same chip off eBay, and later began to build the actual USB charger device, as shown in a step-by-step tutorial here. Essentially, just about anyone can build this device on the cheap.

In his proof-of-concept, Kamkar reveals that his invention will send SMS alerts when the target wireless keyboard broadcasts specific keystrokes, such as the URL to a bank. He also acknowledges that KeySweeper is actually an extension of work previously done by Travis Goodspeed, and work by Thorsten Schroder and Max Moser.

Why the FBI has waited until now to warn the private industry about KeySweeper is unknown. However, the agency points out that the Microsoft wireless keyboards subject to keystroke sniffing are manufactured before 2011, but are still currently on the market to purchase. Kamkar claims that his device can sniff out any Microsoft wireless keyboard transmission, so private companies should keep an eye out for suspicious wireless chargers lounging around no matter what year the Microsoft keyboard was made.

Kevin Parrish
Former Digital Trends Contributor
Kevin started taking PCs apart in the 90s when Quake was on the way and his PC lacked the required components. Since then…
Best Buy Prime Day laptop deals: laptops as cheap as $179
The new Surface Laptop 13 on a white table.

There are plenty of awesome Prime Day laptop deals going on right now as part of the Prime Day deals. So many deals that we’ve actually narrowed things down to one retailer here. All the Best Buy Prime Day laptop deals that are worth your time and money are listed below. Whether you’re looking for a super cheap laptop to take to class or a high-end powerhouse for gaming or content creation, you’ll find a great deal below. We’ve picked out all our favorites as well as taken a look at what you should think about before buying one.
Best Best Buy laptop Prime Day deal
Lenovo IdeaPad 1i -- $280, was $500

For an affordable laptop that will be able to keep up with all of your daily activities, you'll want to go for the Lenovo IdeaPad 1i. It's equipped with the 12th-generation Intel Core i3 processor, Intel UHD Graphics, and 8GB of RAM, which are enough for the usual tasks that you'll have to handle for work or school. The laptop also comes with a 15.6-inch Full HD screen that's big and bright enough to let you handle your projects, and a 256GB SSD that offers ample storage space for your files. With Windows 11 Home pre-loaded, you can start using the Lenovo IdeaPad 1i right after unboxing -- no need to worry about installing an operating system yourself.

Read more
Best Prime Day all-in-one PC deals: $300 off a powerful Dell
The Lenovo IdeaCentre AIO 5i on a white background.

With plenty of Prime Day deals going on, we’ve taken a look at all the best desktop computer deals with a focus on all-in-one PCs in particular. All-in-one PCs are great if you have limited space but want a desktop unit with a sizeable monitor. We’ve picked out all the best Prime all-in-one PC deals below as well as looked at what to consider before buying one. These include offers from HP, Lenovo and Dell Prime Day deals in particular.
The best Prime Day all-in-one PC deal
Inspiron 27 All-in-One -- $1,300, was $1,600

 

Read more