Intelligence and security experts say there is a real risk of cyberattacks on American businesses as retaliation after a U.S. airstrike killed Iranian Gen. Qassem Soleimani. It’s not exactly clear how this new front in warfare could play out. It could, however, be a big, bold attack on symbolic targets, like government websites or the power grid, which Iran openly claims responsibility for. The attacks could even be much more subtle, damaging but not immediately apparent.