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One of the most shocking parts of the recently discovered spying network Equation Group is its mysterious module designed to reprogram or reflash a computer hard drives firmware with malicious code. The Kaspersky researchers who uncovered this said its ability to subvert hard drive firmwarethe guts of any computersurpasses anything else they had ever seen.

The hacking tool, believed to be a product of the NSA, is significant because subverting the firmware gives the attackers God-like control of the system in a way that is stealthy and persistent even through software updates. The module, named nls_933w.dll, is the first of its kind found in the wild and is used with both the EquationDrug and GrayFish spy platforms Kaspersky uncovered.

It also has another capability: to create invisible storage space on the hard drive to hide data stolen from the system so the attackers can retrieve it later. This lets spies like the Equation Group bypass disk encryption by secreting documents they want to seize in areas that dont get encrypted.

Kaspersky has so far uncovered 500 victims of the Equation Group, but only five of these had the firmware-flashing module on their systems. The flasher module is likely reserved for significant systems that present special surveillance challenges. Costin Raiu, director of Kasperskys Global Research and Analysis Team, believes these are high-value computers that are not connected to the internet and are protected with disk encryption.

Heres what we know about the firmware-flashing module.

Hard drive disks have a controller, essentially a mini-computer, that includes a memory chip or flash ROM where the firmware code for operating the hard drive resides.

When a machine is infected with EquationDrug or GrayFish, the firmware flasher module gets deposited onto the system and reaches out to a command server to obtain payload code that it then flashes to the firmware, replacing the existing firmware with a malicious one. The researchers uncovered two versions of the flasher module: one that appears to have been compiled in 2010 and is used with EquatinoDrug and one with a 2013 compilation date that is used with GrayFish.

The Trojanized firmware lets attackers stay on the system even through software updates. If a victim, thinking his or her computer is infected, wipes the computers operating system and reinstalls it to eliminate any malicious code, the malicious firmware code remains untouched. It can then reach out to the command server to restore all of the other malicious components that got wiped from the system.

Even if the firmware itself is updated with a new vendor release, the malicious firmware code may still persist because some firmware updates replace only parts of the firmware, meaning the malicious portions may not get overwritten with the update. The only solution for victims is to trash their hard drive and start over with a new one.

The attack works because firmware was never designed with security in mind. Hard disk makers dont cryptographically sign the firmware they install on drives the way software vendors do. Nor do hard drive disk designs have authentication built in to check for signed firmware. This makes it possible for someone to change the firmware. And firmware is the perfect place to conceal malware because antivirus scanners dont examine it. Theres also no easy way for users to read the firmware and manually check if its been altered.

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