This is a statically compiled version of Busybox that contains multiple built-in utilities including the ash shell. It was created with forensics use cases in mind.
You can download it from the following link: https://packetstormsecurity.com/files/download/125705/busybox.zip
Source: https://packetstormsecurity.com/files/125705/Busybox-Statically-Compiled-With-Ash.html