evgeny9,
I see it mentioned on XDA in the context of a few HTC phones- evo, tattoo, hero, etc.
So, if you are asking about an ARM binary, you can probably dig it out of a system.img file from a ROM from one of those phones (e.g. an Eris PB00IMG.zip file). Generally, you need to use the unyaffs utility to unpack yaffs2 image files.
That might be only the beginning of your troubles, though - I expect it is dynamically linked, and possibly non portable too.
Good luck!