Malko was a Trill hologram in Deep Space 9's Hoobishan Baths holoprogram.
In the program, Malko was a male masseuse, who, according to Jadzia Dax in 2372, gave "amazing" massages. (DS9: "The Way of the Warrior")
Malko was played by regular background actor Scott Strozier in his first
Star Trek role.