Chinese computer maker Lenovo has been caught using a hidden Windows feature to preinstall unwanted and unremovable rootkit software on certain Lenovo laptop and desktop systems it sells. The feature is known as “Lenovo Service Engine” (LSE) a piece of code that presents into the firmware on the computer’s motherboard. LSE automatically downloads and installs Lenovo’s own software during boot time before the Microsoft operating system is launched, overwriting Windows operating system files. Lenovo has since released an official statement, which notes that the systems made from June onwards have BIOS firmware that eliminates the issue.
Source: https://thehackernews.com/2015/08/lenovo-rootkit-malware.html