U.S. stock index futures signaled a rally on Wall Street on Monday, as investors cheered Washington's plan to help financial institutions get rid of troubled assets.

At 0843 GMT (4:43 a.m. EDT), futures for the S&P 500 were up 2.6 percent, Dow Jones futures were up 2.5 percent and Nasdaq 100 futures were up 2.4 percent.

News of the plan, which seeks to woo private investors with public funding, lifted stock markets in Asia and Europe and boosted shares of U.S. banks traded in Frankfurt, with Citigroup up 24 percent and Bank of America up 15 percent.

(Reporting by Blaise Robinson)