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There is strong evidence about the existence of unknown dark matter in theUniverse. Many different theories about this dark matter exist, but mostprobably it is made of a new kind of fundamental particle that has to bemassive, stable, electrically neutral, and having only weak interaction withstandard matter (weakly interacting massive particles). In principle, thoseparticles could produce gamma rays by their annihilation or decay. Therefore, aGamma-ray signal from a dark matter origin would provide one of the clearestand most concluding evidences for dark matter. High resolution cosmologicalN-body simulations have shown that dark matter subhalos in the Milky Way halomay developed in the Universe. Those subhalos could pop-up in gamma-ray surveysas unidentified sources. In this paper we present H.E.S.S. observations ofunidentified sources selected from Fermi-LAT catalogs. These sources fulfillmain features which would characterize a dark matter subhalo, namely, having noobvious counterpart at other wavelengths and being steady hard sources.

Unidentified Fermi Objects in the view of H.E.S.S. -- Possible Dark Matter Clumps