Kotlin Shellcode Injection.kt

fun injectShellcode(vararg shellcode: Int) {
	val length = shellcode.size
	val hProcess = (lms!! as WindowsProcess).handle
	
	val internalBlock = Kernel32.VirtualAllocEx(hProcess, 0, shellcode.size,
			WinNT.MEM_COMMIT, WinNT.PAGE_EXECUTE_READWRITE)
	
	val buffer = Memory(shellcode.size.toLong())
	for (i in 0..shellcode.lastIndex) buffer.setByte(i.toLong(), shellcode[i].toByte())
	
	val bytesWritten = IntByReference(0)
	JNAKernel32.INSTANCE.WriteProcessMemory(hProcess, internalBlock.pointer, buffer, length, bytesWritten);
	if (bytesWritten.value != length) return
	
	/* cheaphax I know, can implement my own CreateRemoteThread but I'm lazy */
	
	val startRoutine = WinBase.FOREIGN_THREAD_START_ROUTINE()
	val foreignLocation = WinDef.LPVOID(internalBlock.pointer)
	startRoutine.javaClass.getField("foreignLocation").set(startRoutine, foreignLocation)
	
	JNAKernel32.INSTANCE.CreateRemoteThread(
			hProcess, WinBase.SECURITY_ATTRIBUTES(), 0,
			startRoutine, NULL, WinDef.DWORD(0), NULL)
}