A program or set of programs which hides itself by subverting or evading the computer's security mechanisms, then allows remote users to secretly control the computer's operating system.
Additional Details
This rootkit will execute on the following operating systems:
Windows 2000
Windows XP
Windows 2003
Windows Vista
Windows Vista SP1
It removes the hooked addresses corresponding to the following NT Functions (which are implemented in Ntoskrnl.exe), then restores them to their original values: