KillRDLL.A is a Trojan designed to create a copy of itself whenever the user accesses a directory. This file has the icon of a Windows folder and the extension hidden so that the user thinks it is a folder.
If the user accesses any subdirectory, it also creates the copy of itself.
KillRDLL.A does not spread automatically using its own means. It needs an attacking user's intervention in order to reach the affected computer.