Stock money flow out to bonds market. so mm wants people to come back to suck some blood. :) By sending rising signle, mm hopes to get them back.
On the other hand, money went to bonds market making its risk higher. As bonds rates are lower (with price higher), coroperations can borrow money with low rate and have more profits. the stocks are relatively cheap and risk is lower.
As U.S. housing market is still bad, bank sectors are bad. I have not seen a reason to be rise for 10% over the past month. I just think it is rising too fast. It just needs a correction.