  The recent high precision measurement of $W$ boson mass by CDF-II
collaboration points to the contribution(s) of new physics beyond the Standard
Model. One of the minimalistic ways to account for the anomalous $W$ boson mass
is by introducing a hyperchargeless real $SU(2)_L$ triplet scalar whose vacuum
expectation value explicitly contributes to the $W$ boson mass at the tree
level while the $Z$ boson mass remains the same. Such a triplet can be
naturally embedded in a singlet-triplet scotogenic model for one loop neutrino
mass generated by dark sector particles running in the loop. We discuss the
detailed phenomenology of the model, obtaining the parameter space consistent
with the CDF-II $W$ boson mass measurements. The dark matter as well as the
constraints comings from $S$, $T$, $U$ parameters are also analyzed.
