1. Cold caller pretend to be IRS,
2. Tells you terrible things are going to happen to all your assets,
3. Tells you that he or she can make the whole thing go away if
4. You send them some money by some untraceable means.
And that's about it.
Been around a while, women seem particularly vulnerable.
I received the same call. I knew it was fraud because the guy had my name incorrect. I called back and he tried to act like he Agent Kyle Cooper with a thick Indian accent. He was Agent Watson the first time.