Seems to me it's one of the Kamov tandem rotor designs. I can't tell exactly which version it is though.
EDIT: According to these two sources, B-7817 is a Ka-32. and
This is logical as the Ka-32 is the export version of the Ka-27. This is further reinforced by this , which says that the preceding helicopter to this one that crashed in 2011 is also a Ka-32.