The TDSS rootkit is a family of rootkits for the Windows operating system. It downloads and executes other malware and delivers advertisements to your computer. This rootkit infects your computer in various ways that include replacing hard disk drivers with malicious versions. Thankfully, Kaspersky Labs has released a tool called TDSSKiller that can be used to remove most variants. We do need to perform some steps in order to get the program to work. These steps are described in the removal guide below.
Source: https://www.bleepingcomputer.com/virus-removal/remove-tdss-tdl3-alureon-rootkit-using-tdsskiller