Files
2022-01-07 13:04:57 +00:00

461 lines
13 KiB
C++

#include <stdio.h>
#include <stdlib.h>
#include <Windows.h>
#include <intrin.h>
typedef void* PRTL_USER_PROCESS_PARAMETERS;
typedef void* PPS_POST_PROCESS_INIT_ROUTINE;
typedef struct _UNICODE_STRING {
USHORT Length;
USHORT MaximumLength;
PWSTR Buffer;
} UNICODE_STRING, *PUNICODE_STRING;
typedef struct _PEB_LDR_DATA //, 7 elements, 0x28 bytes
{
DWORD dwLength;
DWORD dwInitialized;
LPVOID lpSsHandle;
LIST_ENTRY InLoadOrderModuleList;
LIST_ENTRY InMemoryOrderModuleList;
LIST_ENTRY InInitializationOrderModuleList;
LPVOID lpEntryInProgress;
} PEB_LDR_DATA, * PPEB_LDR_DATA;
typedef struct _PEB {
BYTE Reserved1[2];
BYTE BeingDebugged;
BYTE Reserved2[1];
PVOID Reserved3[2];
PPEB_LDR_DATA Ldr;
PRTL_USER_PROCESS_PARAMETERS ProcessParameters;
PVOID Reserved4[3];
PVOID AtlThunkSListPtr;
PVOID Reserved5;
ULONG Reserved6;
PVOID Reserved7;
ULONG Reserved8;
ULONG AtlThunkSListPtr32;
PVOID Reserved9[45];
BYTE Reserved10[96];
PPS_POST_PROCESS_INIT_ROUTINE PostProcessInitRoutine;
BYTE Reserved11[128];
PVOID Reserved12[1];
ULONG SessionId;
} PEB, * PPEB;
typedef struct /*_LDR_DATA_TABLE_ENTRY*/
{
LIST_ENTRY InLoadOrderLinks;
LIST_ENTRY InMemoryOrderModuleList;
LIST_ENTRY InInitializationOrderModuleList;
PVOID DllBase;
PVOID EntryPoint;
ULONG SizeOfImage;
UNICODE_STRING FullDllName;
UNICODE_STRING BaseDllName;
ULONG Flags;
SHORT LoadCount;
SHORT TlsIndex;
LIST_ENTRY HashTableEntry;
ULONG TimeDateStamp;
} LDR_DATA_TABLE_ENTRY, * PLDR_DATA_TABLE_ENTRY;
typedef struct _OBJECT_ATTRIBUTES
{
ULONG Length;
HANDLE RootDirectory;
PUNICODE_STRING ObjectName;
ULONG Attributes;
PVOID SecurityDescriptor; // Points to type SECURITY_DESCRIPTOR
PVOID SecurityQualityOfService; // Points to type SECURITY_QUALITY_OF_SERVICE
} OBJECT_ATTRIBUTES, * POBJECT_ATTRIBUTES;
typedef struct _IO_STATUS_BLOCK
{
union
{
NTSTATUS Status;
PVOID Pointer;
};
ULONG_PTR Information;
} IO_STATUS_BLOCK, * PIO_STATUS_BLOCK;
typedef NTSYSAPI NTSTATUS(NTAPI* FUNC_NTOPENFILE)(
OUT PHANDLE FileHandle,
IN ACCESS_MASK DesiredAccess,
IN POBJECT_ATTRIBUTES ObjectAttributes,
OUT PIO_STATUS_BLOCK IoStatusBlock,
IN ULONG ShareAccess,
IN ULONG OpenOptions
);
typedef NTSTATUS(NTAPI* FUNC_NTCREATESECTION)
(_Out_ PHANDLE SectionHandle, _In_ ACCESS_MASK DesiredAccess,
_In_opt_ POBJECT_ATTRIBUTES ObjectAttributes,
_In_opt_ PLARGE_INTEGER MaximumSize, _In_ ULONG SectionPageProtection,
_In_ ULONG AllocationAttributes, _In_opt_ HANDLE FileHandle);
typedef NTSTATUS(NTAPI* FUNC_NTMAPVIEWOFSECTION)
(_In_ HANDLE SectionHandle, _In_ HANDLE ProcessHandle,
_Inout_ PVOID* BaseAddress, _In_ ULONG_PTR ZeroBits, _In_ SIZE_T CommitSize,
_Inout_opt_ PLARGE_INTEGER SectionOffset, _Inout_ PSIZE_T ViewSize,
_In_ DWORD InheritDisposition, _In_ ULONG AllocationType,
_In_ ULONG Win32Protect);
typedef VOID(NTAPI* FUNC_RTLINITUNICODESTRING)(
IN OUT PUNICODE_STRING DestinationString,
IN PCWSTR SourceString
);
#ifndef NT_SUCCESS
#define NT_SUCCESS(Status) ((NTSTATUS)(Status) >= 0)
#endif
#ifndef InitializeObjectAttributes
#define InitializeObjectAttributes( p, n, a, r, s ) { \
(p)->Length = sizeof( OBJECT_ATTRIBUTES ); \
(p)->RootDirectory = r; \
(p)->Attributes = a; \
(p)->ObjectName = n; \
(p)->SecurityDescriptor = s; \
(p)->SecurityQualityOfService = NULL; \
}
#endif
#define OBJ_CASE_INSENSITIVE 0x40
#define STATUS_IMAGE_NOT_AT_BASE 0x40000003
#define MAX_EXPORT_NAME_LENGTH 64
#define MAX_SYSCALL_STUB_SIZE 64
#define MAX_NUMBER_OF_SYSCALLS 1024
/*
0:001> u ntdll!LdrpThunkSignature
ntdll!LdrpThunkSignature:
00007ff9`2e1860d0 4c8bd1 mov r10,rcx
00007ff9`2e1860d3 b833000000 mov eax,33h
00007ff9`2e1860d8 f604250803fe7f01 test byte ptr [SharedUserData+0x308 (00000000`7ffe0308)],1
00007ff9`2e1860e0 4c8bd1 mov r10,rcx
00007ff9`2e1860e3 b84a000000 mov eax,4Ah
00007ff9`2e1860e8 f604250803fe7f01 test byte ptr [SharedUserData+0x308 (00000000`7ffe0308)],1
00007ff9`2e1860f0 4c8bd1 mov r10,rcx
00007ff9`2e1860f3 b83d000000 mov eax,3Dh
0:001> db ntdll!LdrpThunkSignature
00007ff9`2e1860d0 4c 8b d1 b8 33 00 00 00-f6 04 25 08 03 fe 7f 01 L...3.....%.....
00007ff9`2e1860e0 4c 8b d1 b8 4a 00 00 00-f6 04 25 08 03 fe 7f 01 L...J.....%.....
00007ff9`2e1860f0 4c 8b d1 b8 3d 00 00 00-f6 04 25 08 03 fe 7f 01 L...=.....%.....
00007ff9`2e186100 4c 8b d1 b8 37 00 00 00-f6 04 25 08 03 fe 7f 01 L...7.....%.....
00007ff9`2e186110 4c 8b d1 b8 28 00 00 00-f6 04 25 08 03 fe 7f 01 L...(.....%.....
*/
FUNC_NTOPENFILE NtOpenFile = NULL;
FUNC_NTCREATESECTION NtCreateSection = NULL;
FUNC_NTMAPVIEWOFSECTION NtMapViewOfSection = NULL;
FUNC_RTLINITUNICODESTRING RtlInitUnicodeString = (FUNC_RTLINITUNICODESTRING)GetProcAddress(GetModuleHandle(L"ntdll.dll"), "RtlInitUnicodeString");
ULONG_PTR BuildSyscallStub(ULONG_PTR StubRegion, DWORD dwSyscallNo)
{
BYTE SyscallStub[] =
{
0x4c, 0x8b, 0xd1, // mov r10,rcx
0xb8, 0x00, 0x00, 0x00, 0x00, // mov eax,xxx
0x0f, 0x05, // syscall
0xc3 // ret
};
memcpy((PBYTE)StubRegion, SyscallStub, sizeof(SyscallStub));
*(DWORD*)(StubRegion + 4) = dwSyscallNo;
return StubRegion;
}
BOOL InitSyscallsFromLdrpThunkSignature()
{
PPEB Peb = (PPEB)__readgsqword(0x60);
PPEB_LDR_DATA Ldr = Peb->Ldr;
PLDR_DATA_TABLE_ENTRY NtdllLdrEntry = NULL;
for (PLDR_DATA_TABLE_ENTRY LdrEntry = (PLDR_DATA_TABLE_ENTRY)Ldr->InLoadOrderModuleList.Flink;
LdrEntry->DllBase != NULL;
LdrEntry = (PLDR_DATA_TABLE_ENTRY)LdrEntry->InLoadOrderLinks.Flink)
{
if (_wcsnicmp(LdrEntry->BaseDllName.Buffer, L"ntdll.dll", 9) == 0)
{
// got ntdll
NtdllLdrEntry = LdrEntry;
break;
}
}
if (NtdllLdrEntry == NULL)
{
return FALSE;
}
PIMAGE_NT_HEADERS ImageNtHeaders = (PIMAGE_NT_HEADERS)((ULONG_PTR)NtdllLdrEntry->DllBase + ((PIMAGE_DOS_HEADER)NtdllLdrEntry->DllBase)->e_lfanew);
PIMAGE_SECTION_HEADER SectionHeader = (PIMAGE_SECTION_HEADER)((ULONG_PTR)&ImageNtHeaders->OptionalHeader + ImageNtHeaders->FileHeader.SizeOfOptionalHeader);
ULONG_PTR DataSectionAddress = NULL;
DWORD DataSectionSize;
for (WORD i = 0; i < ImageNtHeaders->FileHeader.NumberOfSections; i++)
{
if (!strcmp((char*)SectionHeader[i].Name, ".data"))
{
DataSectionAddress = (ULONG_PTR)NtdllLdrEntry->DllBase + SectionHeader[i].VirtualAddress;
DataSectionSize = SectionHeader[i].Misc.VirtualSize;
break;
}
}
DWORD dwSyscallNo_NtOpenFile = 0, dwSyscallNo_NtCreateSection = 0, dwSyscallNo_NtMapViewOfSection = 0;
if (!DataSectionAddress || DataSectionSize < 16 * 5)
{
return FALSE;
}
for (UINT uiOffset = 0; uiOffset < DataSectionSize - (16 * 5); uiOffset++)
{
if (*(DWORD*)(DataSectionAddress + uiOffset) == 0xb8d18b4c &&
*(DWORD*)(DataSectionAddress + uiOffset + 16) == 0xb8d18b4c &&
*(DWORD*)(DataSectionAddress + uiOffset + 32) == 0xb8d18b4c &&
*(DWORD*)(DataSectionAddress + uiOffset + 48) == 0xb8d18b4c &&
*(DWORD*)(DataSectionAddress + uiOffset + 64) == 0xb8d18b4c)
{
dwSyscallNo_NtOpenFile = *(DWORD*)(DataSectionAddress + uiOffset + 4);
dwSyscallNo_NtCreateSection = *(DWORD*)(DataSectionAddress + uiOffset + 16 + 4);
dwSyscallNo_NtMapViewOfSection = *(DWORD*)(DataSectionAddress + uiOffset + 64 + 4);
break;
}
}
if (!dwSyscallNo_NtOpenFile)
{
return FALSE;
}
ULONG_PTR SyscallRegion = (ULONG_PTR)VirtualAlloc(NULL, 3 * MAX_SYSCALL_STUB_SIZE, MEM_RESERVE | MEM_COMMIT, PAGE_EXECUTE_READWRITE);
if (!SyscallRegion)
{
return FALSE;
}
NtOpenFile = (FUNC_NTOPENFILE)BuildSyscallStub(SyscallRegion, dwSyscallNo_NtOpenFile);
NtCreateSection = (FUNC_NTCREATESECTION)BuildSyscallStub(SyscallRegion + MAX_SYSCALL_STUB_SIZE, dwSyscallNo_NtCreateSection);
NtMapViewOfSection = (FUNC_NTMAPVIEWOFSECTION)BuildSyscallStub(SyscallRegion + (2* MAX_SYSCALL_STUB_SIZE), dwSyscallNo_NtMapViewOfSection);
return TRUE;
}
ULONG_PTR LoadNtdllIntoSection()
{
NTSTATUS ntStatus;
HANDLE hFile = NULL;
OBJECT_ATTRIBUTES ObjectAttributes = { 0 };
UNICODE_STRING ObjectPath = { 0 };
IO_STATUS_BLOCK IoStatusBlock = { 0 };
HANDLE hSection = NULL;
LARGE_INTEGER maxSize = { 0 };
LPVOID lpvSection = NULL;
SIZE_T viewSize = 0;
RtlInitUnicodeString(&ObjectPath, L"\\??\\C:\\Windows\\System32\\ntdll.dll");
InitializeObjectAttributes(
&ObjectAttributes,
&ObjectPath,
OBJ_CASE_INSENSITIVE,
0,
NULL
);
ntStatus = NtOpenFile(
&hFile,
FILE_READ_DATA,
&ObjectAttributes,
&IoStatusBlock,
FILE_SHARE_READ,
0
);
if (!NT_SUCCESS(ntStatus))
{
goto Cleanup;
}
ntStatus = NtCreateSection(
&hSection,
SECTION_ALL_ACCESS,
NULL,
NULL,
PAGE_READONLY,
SEC_COMMIT,
hFile
);
if (!NT_SUCCESS(ntStatus))
{
goto Cleanup;
}
ntStatus = NtMapViewOfSection(hSection, GetCurrentProcess(), &lpvSection, NULL, NULL, NULL, &viewSize, 1, 0, PAGE_READONLY);
if (!NT_SUCCESS(ntStatus))
{
return NULL;
}
Cleanup:
if (hSection) CloseHandle(hSection);
if (hFile) CloseHandle(hFile);
return (ULONG_PTR)lpvSection;
}
ULONG_PTR RVAToFileOffsetPointer(ULONG_PTR pModule, DWORD dwRVA)
{
PIMAGE_DOS_HEADER DosHeader = (PIMAGE_DOS_HEADER)pModule;
PIMAGE_NT_HEADERS ImageNtHeaders = (PIMAGE_NT_HEADERS)(pModule + ((PIMAGE_DOS_HEADER)pModule)->e_lfanew);
PIMAGE_SECTION_HEADER SectionHeader = (PIMAGE_SECTION_HEADER)((ULONG_PTR)&ImageNtHeaders->OptionalHeader + ImageNtHeaders->FileHeader.SizeOfOptionalHeader);
for (WORD i = 0; i < ImageNtHeaders->FileHeader.NumberOfSections; i++)
{
if (SectionHeader[i].VirtualAddress <= dwRVA && SectionHeader[i].VirtualAddress + SectionHeader[i].Misc.VirtualSize > dwRVA)
{
dwRVA -= SectionHeader[i].VirtualAddress;
dwRVA += SectionHeader[i].PointerToRawData;
return pModule + dwRVA;
}
}
return NULL;
}
ULONG_PTR FindBytes(ULONG_PTR Source, DWORD SourceLength, ULONG_PTR Search, DWORD SearchLength)
{
while (SearchLength <= SourceLength)
{
if (!memcmp((PBYTE)Source, (PBYTE)Search, SearchLength))
{
return Source;
}
Source++;
SourceLength--;
}
return NULL;
}
UINT ExtractSyscalls(ULONG_PTR pNtdll, CHAR rgszNames[MAX_NUMBER_OF_SYSCALLS][MAX_EXPORT_NAME_LENGTH], ULONG_PTR rgpStubs[MAX_NUMBER_OF_SYSCALLS])
{
PIMAGE_DOS_HEADER DosHeader = (PIMAGE_DOS_HEADER)pNtdll;
PIMAGE_NT_HEADERS ImageNtHeaders = (PIMAGE_NT_HEADERS)(pNtdll + ((PIMAGE_DOS_HEADER)pNtdll)->e_lfanew);
PIMAGE_SECTION_HEADER SectionHeader = (PIMAGE_SECTION_HEADER)((ULONG_PTR)&ImageNtHeaders->OptionalHeader + ImageNtHeaders->FileHeader.SizeOfOptionalHeader);
PIMAGE_DATA_DIRECTORY DataDirectory = (PIMAGE_DATA_DIRECTORY)ImageNtHeaders->OptionalHeader.DataDirectory;
DWORD VirtualAddress = DataDirectory[IMAGE_DIRECTORY_ENTRY_EXPORT].VirtualAddress;
PIMAGE_EXPORT_DIRECTORY ExportDirectory = (PIMAGE_EXPORT_DIRECTORY)RVAToFileOffsetPointer(pNtdll, VirtualAddress);
DWORD NumberOfNames = ExportDirectory->NumberOfNames;
NumberOfNames = ExportDirectory->NumberOfNames;
PDWORD Functions = (PDWORD)RVAToFileOffsetPointer(pNtdll, ExportDirectory->AddressOfFunctions);
PDWORD Names = (PDWORD)RVAToFileOffsetPointer(pNtdll, ExportDirectory->AddressOfNames);
PWORD Ordinals = (PWORD)RVAToFileOffsetPointer(pNtdll, ExportDirectory->AddressOfNameOrdinals);
UINT uiCount = 0;
ULONG_PTR pStubs = (ULONG_PTR)VirtualAlloc(NULL, MAX_NUMBER_OF_SYSCALLS * MAX_SYSCALL_STUB_SIZE, MEM_RESERVE | MEM_COMMIT, PAGE_EXECUTE_READWRITE);
if (!pStubs)
{
return 0;
}
for (DWORD i = 0; i < NumberOfNames && uiCount < MAX_NUMBER_OF_SYSCALLS; i++)
{
PCHAR FunctionName = (PCHAR)RVAToFileOffsetPointer(pNtdll, Names[i]);
if (*(USHORT*)FunctionName == 'wZ')
{
ULONG_PTR FunctionPtr = RVAToFileOffsetPointer(pNtdll, Functions[Ordinals[i]]);
ULONG_PTR FunctionEnd = FindBytes(FunctionPtr, MAX_SYSCALL_STUB_SIZE, (ULONG_PTR)"\x0f\x05\xc3", 3) + 3;
if (FunctionEnd)
{
strcpy_s(rgszNames[uiCount], MAX_EXPORT_NAME_LENGTH, FunctionName);
*(WORD*)(rgszNames[uiCount]) = 'tN';
memcpy((PBYTE)pStubs + (uiCount * MAX_SYSCALL_STUB_SIZE), (PBYTE)FunctionPtr, FunctionEnd - FunctionPtr);
rgpStubs[uiCount] = pStubs + (uiCount * MAX_SYSCALL_STUB_SIZE);
uiCount++;
}
}
}
return uiCount;
}
ULONG_PTR GetSyscall(CHAR rgszNames[MAX_NUMBER_OF_SYSCALLS][MAX_EXPORT_NAME_LENGTH], ULONG_PTR rgpStubs[MAX_NUMBER_OF_SYSCALLS], UINT uiCount, PCHAR pzSyscallName)
{
for (UINT i = 0; i < uiCount; i++)
{
if (!strcmp(rgszNames[i], pzSyscallName))
{
return rgpStubs[i];
}
}
return NULL;
}
typedef NTSTATUS(NTAPI* FUNC_NTCREATETHREADEX)(
OUT PHANDLE hThread,
IN ACCESS_MASK DesiredAccess,
IN PVOID ObjectAttributes,
IN HANDLE ProcessHandle,
IN PVOID lpStartAddress,
IN PVOID lpParameter,
IN ULONG Flags,
IN SIZE_T StackZeroBits,
IN SIZE_T SizeOfStackCommit,
IN SIZE_T SizeOfStackReserve,
OUT PVOID lpBytesBuffer);
int main(void)
{
InitSyscallsFromLdrpThunkSignature();
ULONG_PTR pNtdll = LoadNtdllIntoSection();
CHAR rgszNames[MAX_NUMBER_OF_SYSCALLS][MAX_EXPORT_NAME_LENGTH] = { 0 };
ULONG_PTR rgpStubs[MAX_NUMBER_OF_SYSCALLS] = { 0 };
UINT uiCount = ExtractSyscalls(pNtdll, rgszNames, rgpStubs);
FUNC_NTCREATETHREADEX NtCreateThreadEx = (FUNC_NTCREATETHREADEX)GetSyscall(rgszNames, rgpStubs, uiCount, (PCHAR)"NtCreateThreadEx");
NTSTATUS ntStatus;
HANDLE hThread = NULL;
ntStatus = NtCreateThreadEx(&hThread, GENERIC_ALL, NULL, GetCurrentProcess(), (LPTHREAD_START_ROUTINE)0x41414141, NULL, 0, 0, 0, 0, NULL);
if (!NT_SUCCESS(ntStatus))
{
return FALSE;
}
Sleep(INFINITE);
return 0;
}