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CosmicStrand UEFI Firmware Rootkit 2022


CosmicStrand UEFI Firmware Rootkit 2022.

A new kind of sophisticated Unified Extensible Firmware Interface (UEFI) firmware rootkit called CosmicStrand has been found by experts, who says that its an unknown Chinese-speaking threat actor behind it.

An early variant of this Malware was discovered in 2017 by Qihoo360.

It is still unknown how the victims motherboards were infected, but the rootkit was found located in the firmware images of Gigabyte and ASUS motherboards. Specifically those using designs with the H81 chipset.

Kaspersky security researchers said "This suggests that a common vulnerability may exist that allowed the attackers to inject their rootkit into the firmware’s image."

"In these firmware images, modifications have been introduced into the CSMCORE DXE driver, whose entry point has been patched to redirect to code added in the .reloc section. This code, executed during system startup, triggers a long execution chain which results in the download and deployment of a malicious component inside Windows."

The theory is that the motherboards were flashed with the Malware infected images, before being sold to a second-hand reseller.

Victims of the CosmicStrand rootkit were found in China, Vietnam, Iran and Russia.

This UEFI implant seems to have been used in the wild since the end of 2016.

It is particularly invasive because it survives an OS reinstall and hard disk replacement and it can only be removed by re-flashing the firmware of the motherboard or buy a brand new motherboard.


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