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https://en.wikipedia.org/wiki/DLL_injection

My question: When someone is doing a DLL injection does anything gets written to disk? Or the whole attack is just in Memory?

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DLL injection is a technique used for running code within the address space of another process by forcing it to load a dynamic-link library.

Address space is in Memory.

Now that's not to say that nothing will get written to disk. I could modify an executable in such a way that it loads xyz.dll on load. On the flip side of things, I could run my own project to inject code into the program to force it to load xyz.dll without writing anything to disk.

So the answer here is it depends.

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