I was on the way up to Bruma when I ran across a group of outlaws (worth noting, I'm using FCOM + assorted weapon/item adder mods with Item Interchange). Being level 2 they were pretty tough but I eventually managed to beat them. However, when they attacked me their weapons also hit me with Drain Strength and Drain Speed -- but when I checked their corpses and their dropped weapons, there was no such enchantments on the weapons. In fact, they weren't even enchanted at all. I was kind of expecting to pick a Drain Speed and Drain Strength enchantment up off their axe and hammer after that...
So, is this normal behavior, or is this the result of a mod? It just totally threw me for a loop since it's behavior I've never seen in Morrowind.