Given that you have a ceramic IC, excessive force, heating, and acids are out of the question. That leaves you with organic solvents.
According to this source, dichloromethane is most effective. If you use DCM, apply it only locally to the epoxy and don't let it come into contact with the rest of the IC. Don't let it run off the sides of the IC as it may seep into it through tiny cracks in its seals. DCM will also dissolve the markings as well. Alternatively, toluene or methyl-ethyl-ketone might work.
Note that dichloromethane is quite harmful, only do this outside.
In general, read the safety datasheets for any chemicals you want to use before ordering / using them. Always wear proper protective equipment, which in this case is at least a pair of well-sealing safety goggles. While it might seem counter-intuitive, do not use gloves (at least not random supermarket ones). DCM will attack most glove materials, which makes a splash onto your hands worse than if you just didn't wear any.
You should of course avoid getting solvents onto your skin, so I'd recommend applying small drops of solvent to the epoxy with a pipette and then just letting it sit.
