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Past analyses of the equation of state (EoS) of the Dark Energy (DE) were notincompatible with a phantom phase near our time. This has been the case in theyears of WMAP observations, in combination with the remaining cosmologicalobservables. Such situation did not completely disappear from the datacollected from the Planck satellite mission. In it the EoS analysis may stillbe interpreted as suggesting w<-1, and so a mildly evolving DE cannot bediscarded. In our opinion the usual ansatzs made on the structure of the EoSfor dynamical DE models (e.g. quintessence and the like) are too simplified. Inthis work we examine in detail some of these issues and suggest that a generalclass of models with a dynamical vacuum energy density could explain thepersistent phantom anomaly, despite there is no trace of real phantom behaviorin them. The spurious or "mirage" effect is caused by an attempt to describethem as if the DE would be caused by fundamental phantom scalar fields.Remarkably, the effective DE behavior can also appear as quintessence intransit to phantom, or vice versa.

Effective equation of state for running vacuum: "mirage" quintessence and phantom dark energy