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Windows ROP

General

VirtualAlloc Shellcode with RWX

Virtual Alloc can allocate memory or change the permissions on existing one.
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LPVOID WINAPI VirtualAlloc(
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_In_opt_ LPVOID lpAddress,
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_In_ SIZE_T dwSize,
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_In_ DWORD flAllocationType,
5
_In_ DWORD flProtect
6
);
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  • The function address in kernel32 can be fetched from a modules IAT at runtime

WriteProcessMemory

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BOOL WriteProcessMemory(
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HANDLE hProcess,
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LPVOID lpBaseAddress,
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LPCVOID lpBuffer,
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SIZE_T nSize,
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SIZE_T *lpNumberOfBytesWritten
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);
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WriteProcessMemory will automatically make the target Page writeable - so it is possible to copy to a RX Page and then jump there.

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General
VirtualAlloc Shellcode with RWX
WriteProcessMemory
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