TDSSKiller

TDSSKiller is a single-purpose utility designed to remove various rootkits and related attack applications. It is particularly useful when malicious activity is suspected on a computer that is not detected by antivirus and other security applications.

TDSSKiller is a portable program - so there is no need to install it. Once started, all you need to do is agree to the license terms and conditions and the Kaspersky Security Network statement. After that, the program is ready to use.