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The appearance of a $3.5$ keV photon line in the X-ray spectra of Andromedagalaxy and other galaxy clusters including the Perseus galaxy can beinterpreted as the signal of a $7$ keV sterile neutrino dark matter candidateas one of the plausible explanations. We present here a novel framework ofextended seesaw mechanism where the lightest sterile neutrino acts as a DarkMatter candidate and its decay into a photon and an ordinary neutrino accountsfor the excess 3.5 keV X-ray line. For implementing the idea, we add twodifferent types of neutral fermion singlets ($S_L$, $N_R$) to the SM lightneutrino $\nu_L$ so that the light neutrino mass is governed by generic linearseesaw formula. We discuss the complementarity constraints on the modelparameters including sterile-active neutrino mixing angle within the extendedseesaw framework. Favorably, this framework can be embedded in a $SO(10)$ grandunified theory.

7 keV sterile neutrino Dark Matter in extended seesaw framework