Mastering Assembly Programming

A complex scenario

We have just gone through a simplistic scenario of patching a PE executable; alas, real-life situations are rarely that simple and modifications are usually much more complex than simply importing a different function. Is there a way to statically patch executables in such cases? Of course there is. In fact, there are more than one. For example, one may patch a certain procedure within the file, thus altering the algorithm it implements. This is, however, only possible when the existing procedure occupies enough space for the new code. Another option is to add an executable section to a PE file, which is rather simple and deserves being examined here. The whole process contains five easy steps (six, --if modifying the ...