Last year the CAT 5 cable supplied with my Stereomour kit did not have the foil nor the drain wire.
Fortunately, I had a roll of solid core "backbone" CAT 5 that had the foil and drain wire.
If you need to get the right STP (CAT 5) cable be sure to look for "backbone" cable. This will be solid core wire vice stranded and is used where the wire will not be subject to flexing, such as installed in walls. Stranded wire is used where the user will be moving the wire, plugging/unplugging, etc. and can holdup to more frequent flexing. Solid core wire is more easily broken under these circumstances.
Doing soldering work with stranded wire is always a pain in the rear.