![]() Our experiment shows that sensitive data can be successfully Finally, we discuss hardware and software countermeasuresįor such a threat. LEDs (red, blue, and white) and tested different types of receivers: remoteĬameras, extreme cameras, security cameras, smartphone cameras, drone cameras,Īnd optical sensors. During theĮvaluation, we examine the physical characteristics of different colored HDD User-level malware, that doesn't require a kernel component. Present various data modulation methods and describe the implementation of a Technical background regarding the HDD LED and its hardware control. We discuss attack scenarios and present the necessary Routinely flickers frequently, and therefore the user may not be suspicious toĬhanges in its activity. Our method is unique, because it is also covert - the HDD activity LED Sensitive information can be encodedĪnd leaked over the LED signals, which can then be received remotely byĭifferent kinds of cameras and light sensors. Visual perception capabilities of humans. It on and off rapidly (up to 5800 blinks per second) - a rate that exceeds the We show that a malware can indirectly control the HDD LED, turning Our method utilizes the hard diskĭrive (HDD) activity LED which exists in most of today's desktop PCs, laptopsĪnd servers. Just my two cents.Download a PDF of the paper titled LED-it-GO: Leaking (a lot of) Data from Air-Gapped Computers via the (small) Hard Drive LED, by Mordechai Guri and 3 other authors Download PDF Abstract: In this paper we present a method which allows attackers to covertly leakĭata from isolated, air-gapped computers. Spinning up and down will strain the drive motor so it's best to limit these situations. I set my HDD Standby setting to 120 minutes and am considering bumping that up to the next value. Keep in mind that even if you are not "accessing" your NAS shares, it's possible and very likely that when a system just checks to see if the share is still there that is will cause the drives to spin up. You may see your hard drive spinning down and back up again quite a bit but it depends on what you are using the NAS for. The acoustic control can be any settings but I think disabled works well.ġ0 minutes for HDD Standby seems a bit low. ![]() ![]() If you plan to run your hard drives (no Standby setting) the I recommend setting APM to 128, it will unload the heads if I recall correctly and save a tiny amount of power, and I mean tiny but in a large array this could be a few watts of power. Oh yea, APM will certainly mess with your drives if set incorrectly. And what version of FreeNAS are you running, I doubt it's the issue however you never know.ĮDIT: So you are using the eSATA as well? You can try to unplug that one to see if the problem goes away. If you could be as descriptive as possible it would help. ![]() If it is remains lit, either the HDD LED is connected tot he wrong location, or backwards, or your motherboard could just have failed.ħ) If you remove the USB drive and power on the computer it should have nothing to boot from and the HDD LED should remain out. Waiting another 1 minute does the HDD LED go out?Ģ) If it doesn't, reconnect the Ethernet cable.ģ) Hopefully you have some shared folder on the NAS because now I want you to copy a LARGE file to it and watch to see if the LED goes out at all.Ĥ) If the LED goes out then you have the LED wired improperly to the motherboard.ĥ) If the LED never goes out then shutdown the NAS, disconnect the hard drive cables, reboot (assuming you are booting from a USB drive).Ħ) Report what the HDD LED is doing from power on through bootup. If you have left the NAS on for a few hours and the HDD LED has not gone out, try the below steps.ġ) After turning on the NAS let it sit for 10 minutes then unplug the Ethernet cable. It's not the sailors fault, they are not trained to the level they one were. ![]() I deal with sailors all the time and we have to spell everything out. Sorry if I treat you as if you know nothing here but if I assume you know what you are saying and you in fact misunderstood something, well we make no headroom. ![]()
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