  We explore a class of simplified extensions to the Standard Model containing
a complex singlet scalar as a dark matter candidate accompanied by a
vector-like lepton as a mediator, both charged under a new $Z_3$ symmetry. In
its simplest form, the new physics couples only to right-handed electrons, and
the model is able to accommodate the correct dark matter relic abundance around
the electroweak scale up to several TeV evading the strongest constraints from
perturbativity, collider and dark matter searches. Furthermore, the model is
capable to enhance naturally positron fluxes by several orders of magnitude
presenting a box-shape spectra. This framework opens up a lot of
phenomenological possibilities depending on the quantum charge assignments of
the new fields.
