I think this is too big to be users PCs getting hit. This forum, the BT one linked and another i use have had these spam emails sent to contacts over the last few days. Yahoo you can see where login attempts have been made, and people are seeing their account accessed from all over Europe.
Seems specific to BT/Yahoo service and going on recent high profile security breaches i would guess this is another one
Edited by bobble_bob (Mon 04-Mar-13 19:48:48)