  The Dark Abelian Sector Model (DASM) is an extension of the Standard Model of
particle physics with an additional spontaneously broken $U_\text{d}(1)$ gauge
symmetry connected to a dark sector, i.e. the SM particles do not carry the
corresponding charge. In addition to the gauge boson resulting from the extra
$U_\text{d}(1)$ gauge symmetry, the particle content is extended by a further
Higgs boson, one Dirac fermion as well as right-handed neutrinos. Employing the
$U_Y(1)$ field-strength tensor as well as the SM Higgs mass operator (the only
two singlet operators of the SM with dimension less than four) and the
right-handed neutrino fields, we open three portals to the dark sector.
  After an introduction of the model, we discuss a renormalization scheme for
the complete model with a special focus on the renormalization of the mixing
angles. Finally, as an example of application, we present the prediction for
the W-boson mass derived from muon decay in the DASM.
