Disk led for android5/11/2023 ![]() In the past few years, researchers have come up with several ways of exfiltrating data from air-gapped systems, including via electromagnetic, acoustic, thermal and optical methods. The team at Ben-Gurion University of the Negev has published a video showing how such an attack can be carried out with the aid of a drone: As for reception and decoding, the attacker must find a way to observe the targeted device’s activity LED, either using a local hidden camera, a high-resolution camera that can capture images from outside the building, a camera mounted on a drone, a compromised security camera, a camera carried by a malicious insider, or optical sensors. The data can be encoded using several methods: LED on is “1” and LED off is “0” (OOK encoding), off and on is “0” and on and off is “1” (Manchester encoding, which is slower but more reliable), or on for a certain duration is “1” and on for a different duration is “0” (Binary Frequency Shift Keying).Ī piece of malware that is installed on the targeted air-gapped device can harvest data and exfiltrate it using one of these encoding systems. The state of the LED can be translated into “0” or “1” bits. Experts have determined that these LEDs can blink up to 6,000 times per second, which allows for high data transmission rates. More precisely, the size of the buffer being written or read is proportional to the amount of time the LED stays on, while sleeping causes the LED to be turned off. ![]() The blinking frequency and duration depend on the type and intensity of the operation being performed.Īccording to researchers, a piece of malware can indirectly control the LED using specific read/write operations. Many desktop and laptop computers have an HDD activity indicator, which blinks when data is being read from or written to the disk. However, all that is being reflected merely by a blinking LED.Researchers at Ben-Gurion University of the Negev in Israel have disclosed yet another method that can be used to exfiltrate data from air-gapped computers, and this time it involves the activity LED of hard disk drives (HDDs). Using any Windows performance counter as its data source, DiskLED can access pretty much every moving data in your system, starting with RAM usage or network traffic. Users that like to tweak things will enjoy this level of flexibility. ConclusionĭiskLED is a lightweight and straightforward app that offers lots of monitoring options just to support a blinking LED in your system tray. It can also be easily moved on USB sticks and ported on other computers, and it will run easily straight from the executable file. You may specify the number of milliseconds the utility needs to update its information about your system's performance. ![]() You can help DiskLED better calculate system activity by inputting the number you consider to be 100% of system utilization. ![]() This way, you'll get an accurate representation of how your computer module works with the accuracy of a blinking LED. Each module found on that list can have its counter and instance changed. The program isn't limited to only monitoring your HDD, but you can set it to survey any component found in your computer, that include RAM, CPU, and a whole list of other objects. In this regard, DiskLED places the little LED in your system tray instead of your computer case and offers some options to customize it as well. Although it's not really a critical feature to have, some users would like to have a little light showing them that their HDD is alive and kicking. Not all computer cases have HDD LEDs that flicker every time the main hard drive is working. All it does is effectively flicker an LED-type icon in the system tray. DiskLED is a small application that indicates when your hard disk is actively transferring data.
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