RebateBlast is the name of a new adware program. Today it may easily implant your PC as a result of you installing some other application. Mainly these could be some free utilities which you download online and install right away. The problem is that such free applications are often bundled with all sorts of extras, such as browser extensions, add-ons, toolbars and all kinds of adware applications. RebateBlast is just one of them. There are, of course, many other similar applications which are fairly considered as potentially unwanted ones.