It's Cminor with a diminished leading tone chord. Why you don't have the diminished seventh on that B diminished is beyond me, it would help you lead into it... then again... Of course, it could just be C harmonic Minor since there's no Bb. Well, it IS C harmonic minor, but I'm gonna call it Cminor with a diminished leading-tone chord because that's also true of those notes and it sounds much smarter.