Cheat Engine

[The0neThe0nly]

I want to write assembly code to a specific location in another program. In my assembly code, I use jmp (module+offset). The location of (module+offset) and the location of the assembly code I wrote changes every time too (I'm using VirtualAllocEx). How would I write jmp (module+offset) to the program? When I try WriteProcessMemory the bytes change because so do the locations of the addresses each time I allocate memory and/or restart the program. I looked at this thread but I don't think it would work because I am not doing this from a dll, and instead I am doing it from an executable. Any ideas?

[atom0s]

You need to calculate the jump based on the allocated cave and the original jump location.

YourAllocatedCave - OriginalLocation - 5 (for the jump instruction length)

[STN]

That macro will work just fine because the formula for calculating jmps is the same whether you use it inside dll or from another process.

Use your allocated cave as the code cave address (instead of the function address that that thread uses) and your original code (module+offset) as the original code location. Instead of using hard-coded addresses, you use locations you calculate on the fly (variables).

You can also simply use
mov eax, your codecave/destination
jmp eax

or
push your codecave/destination
ret

Simply calculate the opcodes for them (on the fly) and WPM them like you do a JMP.