  The observed dark matter abundance in the Universe can be explained with
non-thermal, heavy dark matter models. In order for dark matter to still be
present today, its lifetime has to far exceed the age of the Universe. In these
scenarios, dark matter decay can produce highly energetic neutrinos, along with
other Standard Model particles. To date, the IceCube Neutrino Observatory is
the world's largest neutrino telescope, located at the geographic South Pole.
In 2013, the IceCube collaboration reported the first observation of
high-energy astrophysical neutrinos. Since then, IceCube has collected a large
amount of astrophysical neutrino data with energies up to tens of PeV, allowing
us to probe the heavy dark matter models using neutrinos. We search the IceCube
data for neutrinos from decaying dark matter in galaxy clusters and galaxies.
The targeted dark matter masses range from 10 TeV to 10 PeV. In this
contribution, we present the method and sensitivities of the analysis.
