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I'm starting in RE too (since beggining of 2020), and I thought I could put here what I've learned so far. Maybe it might be of help.
So first of all, you need Assembly knowledges. You asked if it's still worth to learn x86 because there is x64 now. Well, that's a thing I learned too. x64 is just an extension of x86. The real name for x64 is actually x86_64. ...
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josh's answer is a good one, but one thing to note is that there is an alternative scheme that (usually) does not require inline assembly, and which handles the virtual functions case also. This is how I prefer to interact with C++ programs when I'm doing DLL injection/code reuse like your question is asking.
Begin by defining something for the class whose ...
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This is an interesting problem where some issues have to be solved.
For the first part of your question: How to run an exe from memory, you might want to consult the following link:
https://stackoverflow.com/questions/305203/createprocess-from-memory-buffer
In the following, I will try to show you how to tackle your second question, how to call a class ...
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