On Windows Syscall Mechanism and Syscall Numbers Extraction Methods

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Everyone who’s familiar with operating systems theoretical structure, whether he attented a college course or he has just read a book on this subject, knows the concept of a system call i.e. how a user space application talks with the kernel asking it to perform various jobs such as opening a file, creating a memory mapped region, etc.

Those system calls are usually described as putting some value ( the syscall number ) in a CPU register and then call an OS dependant interrupt, for instance ( the syscall number here was totally invented, just showing you an example )

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mov eax, 0x1234
lea edx, [esp+4]
int 0x2E

This piece of assembly code would invoke the 0x1234 syscall on a 32bit Windows 2000 system, but this mechanism had deeply changed starting from Windows XP and later versions.

XP, SYSENTER and KiFastSystemCall

Windows XP was the first version of the Microsoft OS which introduced the KiFastSystemCall mechanism, look at the following code which is basically the same as the previous one:

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mov eax, 0x1234
mov edx, address of ntdll!KiFastSystemCall
call edx
retn 8

If we disassemble the KiFastSystemCall symbol exported by ntdll.dll we find the following code:

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mov edx, esp
sysenter
retn

Notice the sysenter operator, as stated by the Intel instruction set reference manual ( vol. 2 p. 721 ) :

The SYSENTER instruction is part of the "Fast System Call" facility introduced on the
Pentium® II processor. The SYSENTER instruction is optimized to provide the maximum
performance for transitions to protection ring 0 (CPL = 0).

The SYSENTER and SYSEXIT instructions do not constitute a call/return pair; therefore, the
system call "stub" routines executed by user code (typically in shared libraries or DLLs) must
perform the required register state save to create a system call/return pair.
The SYSENTER instruction always transfers to a flat protected mode kernel at CPL = 0.
SYSENTER can be invoked from all modes except real mode.

So this is basically a new opcode introduced by Intel which makes swapping from Ring 3 to Ring 0 and back faster than it was with the old interrupt call.

64bit Systems

You will find that on 64bit systems things are slightly different ( I’ve just tested this on a Windows 7 SP1 64bit installation, please correct me if I’m wrong for other OS versions ), if we take a look at the code of NtCreateFile inside ntdll, the code is:

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mov     r10, rcx
mov     eax, 52h
syscall
retn

As you can see there’s no call to KiFastSystemCall, instead the eax register is filled with the syscall number ( 52h in this case ) and sysenter is called directly by the NT API, but what about 32bit applications running under a WOW64 environment ?

Just WOW64

Obviously there’s some trick behind it, how a 32bit application could ask a 64bit processor to perform a transition from Ring3 to Ring0? As you probably know, Windows has a subsystem called WOW64 which acts as an emulation layer for 32bit apps under 64bit architectures. Among other things WOW64 is composed by a full set of 32bit stub/proxy libraries who make the app run without problems while WOW manages the switch between 32bit and 64bit OS code. An example of the KiFastSystemCall mechanism under WOW64 would be ( always talking about NtCreateFile )

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mov	eax,52h
xor	ecx,ecx
lea	edx,[esp+04h]
call	fs:[C0h]
add	esp,04h
retn	002Ch

Very similar to the 32bit counterpart, but this time the call is towards FS:C0h, a field in the TIB which contains a pointer to another call. So let’s try to see what’s in there with the following C application.

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#include <windows.h>
#include <stdio.h>

int main(int argc, char* argv[])
{
	printf( "FS:[C0h]         : %08X\n", __readfsdword(0xc0) );
	printf( "KiFastSystemCall : %08X\n", GetProcAddress( GetModuleHandle("ntdll"), "KiFastSystemCall" ) );
}

On my computer this program prints the following results:

FS:[C0h]         : 75452320
KiFastSystemCall : 77B101D0

It is clear that we’re not invoking KiFastSystemCall anymore, so what’s at address 75452320 and by whom is contained? Nothing OllyDbg can’t find out :)

OllyDbg WOW64 Syscall

Wait, what?! An anonymous memory region? Let’s go deeper …

OllyDbg WOW64 jmp

And this is where the transition from 32bit to 64bit code occurs, with a far jump to 7545271E with the code segment being set at 33h, i.e. a jmp to the symbol CpupReturnFromSimulatedCode of wow64cpu.dll, a 64bit library which is always loaded into a 32bit application address space but it’s hidden from the PEB by the OS itself ( that’s why Olly saw it as an anonymous memory region ).
Going deeper in its content we would see that the syscall is performed just as we saw before, setting the proper syscall number and then calling the real KiFastSystemCall from 64bit ntdll.dll.

Extracting Syscall Numbers

Using raw system calls instead of normal high level API is obviously unusual and unnecessarily uncomfortable, except if you want to evade some monitoring/hooking software and obtain a basic code obfuscation … think about it, you won’t use any API but just set up some registers and then calling sysenter, isn’t it cool ? :)
The problem here is on every Windows version, and among each service pack too syscall numbers may vary and there’s no official way to obtain the correct values for the system your application is running on.
By “official ways” I mean there’s no API Microsoft implemented to have this information, but we can always extract those values from the ntdll library we can find during runtime.
We can load it with a simple LoadLibrary, obtain a pointer to the API we’re interested in ( let’s say NtCreateFile ) with GetProcAddress and examine the first opcodes in it … would’t it be cool if we could achieve the same result without loading the library but manually inspecting its content as a portable executable file? Of course it would, we can easily open ntdll.dll, inspect its export directory, obtain the RVA and raw offset of NtCreateFile and then check the first bytes of opcodes. We’ve to expect the first byte to be B8h which is a MOV EAX, IMM32 so we can take the four next bytes and have our syscall number.

The following is an example program I’ve made for this purpose, it parses ntdll export directory and prints a table with each syscall number, RVA and relative API name.

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#include <stdio.h>
#include <Windows.h>

#define IS_ADDRESS_BETWEEN( left, right, address ) ( (address) >= (left) && (address) < (right) )

PIMAGE_SECTION_HEADER SectionByRVA( PIMAGE_SECTION_HEADER pSections, DWORD dwSections, DWORD rva )
{
   PIMAGE_SECTION_HEADER pSectionHeader = pSections;
   DWORD i;

   for( i = 0; i < dwSections; i++, pSectionHeader++ )
   {
      // Is the RVA within this section?
      if( IS_ADDRESS_BETWEEN( pSectionHeader->VirtualAddress, ( pSectionHeader->VirtualAddress + pSectionHeader->SizeOfRawData ), rva ) )
         return pSectionHeader;
   }

   return 0;
}

DWORD RawOffsetByRVA( PIMAGE_SECTION_HEADER pSections, DWORD dwSections, DWORD dwFileSize, DWORD rva )
{
	PIMAGE_SECTION_HEADER pSectionHeader;
	DWORD dwOffset, dwDelta;

	pSectionHeader = SectionByRVA( pSections, dwSections, rva );
	if ( !pSectionHeader )
	{
		return 0;
	}

	dwDelta  = rva - pSectionHeader->VirtualAddress;
	dwOffset = pSectionHeader->PointerToRawData + dwDelta;

	if( dwOffset >= dwFileSize )
		return 0;
	else
	{
		return dwOffset;
	}
}

#define GET_POINTER(RVA) ( pBuffer + RawOffsetByRVA( Sections, dwSections, dwFileSize, (RVA) ) )

int main(int argc, char* argv[])
{
	HANDLE hFile = INVALID_HANDLE_VALUE,
		   hMap  = NULL;
	PBYTE pBuffer = NULL, pOps = NULL;
	DWORD dwFileSize = 0,
		  dwSizeOfHeaders = 0,
		  dwSections = 0,
		  dwBaseAddress = 0,
		  dwImageSize = 0,
  	      dwExportRVA  = 0,
		  dwExportSize = 0,
		  dwExportRaw  = 0,
		  dwExports = 0;
	PDWORD pdwFunctions, pszFunctionNames;
	PWORD  pwOrdinals;
	PIMAGE_NT_HEADERS     NTHeader;
	PIMAGE_DOS_HEADER     DOSHeader;
	PIMAGE_SECTION_HEADER Sections;
	PIMAGE_EXPORT_DIRECTORY pExportDirectory;

	hFile = CreateFile
	(
		"c:\\windows\\system32\\ntdll.dll",
		GENERIC_READ,
		FILE_SHARE_READ | FILE_SHARE_DELETE,
		NULL,
		OPEN_EXISTING,
		FILE_ATTRIBUTE_NORMAL,
		NULL
	);

	if( hFile == INVALID_HANDLE_VALUE )
	{
		fprintf( stderr, "Could not open file: %08X\n", GetLastError() );
		goto done;
	}

	dwFileSize = GetFileSize( hFile, NULL );

	hMap = CreateFileMapping( hFile, NULL, PAGE_READONLY, 0, 0, NULL );
	if( hMap == NULL )
	{
		fprintf( stderr, "Could not create memory map: %08X\n", GetLastError() );
		goto done;
	}

	pBuffer = (PBYTE)MapViewOfFile( hMap, FILE_MAP_READ, 0, 0, 0 );
	if( hMap == NULL )
	{
		fprintf( stderr, "Could not obtain memory map view: %08X\n", GetLastError() );
		goto done;
	}

	if( pBuffer[0] != 'M' || pBuffer[1] != 'Z' )
	{
		fprintf( stderr, "Unexpected file header.\n" );
		goto done;
	}

	// start reading PE headers
	DOSHeader = (PIMAGE_DOS_HEADER)pBuffer;
	NTHeader  = (PIMAGE_NT_HEADERS)( pBuffer + DOSHeader->e_lfanew );

	dwSizeOfHeaders = NTHeader->OptionalHeader.SizeOfHeaders;
	dwBaseAddress   = NTHeader->OptionalHeader.ImageBase;
	dwImageSize     = NTHeader->OptionalHeader.SizeOfImage;
	dwSections      = NTHeader->FileHeader.NumberOfSections;

	// get first section header
	Sections = (PIMAGE_SECTION_HEADER)
	(
		pBuffer +
		DOSHeader->e_lfanew +
		sizeof(IMAGE_NT_HEADERS)
	);

	// now parse the export directory
	dwExportRVA  = NTHeader->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_EXPORT].VirtualAddress;
	dwExportSize = NTHeader->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_EXPORT].Size;
	dwExportRaw  = RawOffsetByRVA( Sections, dwSections, dwFileSize, dwExportRVA );

	if( !dwExportRVA || !dwExportSize || !dwExportRaw )
	{
		fprintf( stderr, "Unexpected export directory structure.\n" );
		goto done;
	}

	pExportDirectory = (PIMAGE_EXPORT_DIRECTORY)( pBuffer + dwExportRaw );
	pdwFunctions     = (PDWORD)GET_POINTER( pExportDirectory->AddressOfFunctions );
	pwOrdinals       = (PWORD)GET_POINTER( pExportDirectory->AddressOfNameOrdinals );
	pszFunctionNames = (PDWORD)GET_POINTER( pExportDirectory->AddressOfNames );
	dwExports		 = pExportDirectory->NumberOfNames;

	printf( "SYSCALL   RVA       NAME\n" );
	printf( "-----------------------------------------------\n" );

	// loop each exported symbol by name
	for( DWORD i = 0; i < pExportDirectory->NumberOfNames; ++i )
	{
		DWORD dwNameRVA = pszFunctionNames[ i ],
			  dwApiRVA  = pdwFunctions[ pwOrdinals[ i ] ],
			  dwSyscall = 0,
			  dwApiRaw  = RawOffsetByRVA( Sections, dwSections, dwFileSize, dwApiRVA ),
			  dwNameRaw = RawOffsetByRVA( Sections, dwSections, dwFileSize, dwNameRVA );

		pOps = pBuffer + dwApiRaw;

		/*
		 * Check if the API entry begins with:
		 *
		 *	MOV  EAX, IMM32
		 *  XOR  ECX, ECX
		 *  LEA  EDX, [ESP+04h]
		 *  CALL FS:[C0h]
		 *
		 * Or
		 *
		 *	MOV  EAX, IMM32
		 *  MOV  ECX, IMM32
		 *  LEA  EDX, [ESP+04h]
		 *  CALL FS:[C0h]
		 */
		if( pOps[0] == 0xB8 &&									            // mov eax, imm32
			(
				(
					pOps[5] == 0x33 && pOps[6] == 0xC9 &&		            // xor ecx, ecx
					!memcmp( &pOps[7],  "\x8D\x54\x24\x04", 4 ) &&          // lea edx, [esp+04h]
					!memcmp( &pOps[11], "\x64\xFF\x15\xC0\x00\x00\x00", 7 ) // call fs:[C0h]
				)
			||
				(
					pOps[5] == 0xB9 &&								        // mov ecx, imm32
					!memcmp( &pOps[10], "\x8D\x54\x24\x04", 4 ) &&          // lea edx, [esp+04h]
					!memcmp( &pOps[13], "\x64\xFF\x15\xC0\x00\x00\x00", 7 ) // call fs:[C0h]
				)
			)
		)
		{
			/*
			 * Extract the IMM32 part, this is our syscall number.
			 */
			dwSyscall  = *(DWORD *)( pOps + 1 );

			printf( "%08X  %08X  %s\n", dwSyscall, dwBaseAddress + dwApiRVA, pBuffer + dwNameRaw );
		}
	}

done:

	if( hFile != INVALID_HANDLE_VALUE )
	{
		CloseHandle( hFile );
	}

	if( pBuffer != NULL )
	{
		UnmapViewOfFile( pBuffer );
	}

	if( hMap != NULL )
	{
		CloseHandle( hMap );
	}

	return 0;
}

On my Windows 7 computer the output is:

SYSCALL   RVA       NAME
-----------------------------------------------
00000060  7DE90210  NtAcceptConnectPort
00000061  7DE90228  NtAccessCheck
00000026  7DE8FC68  NtAccessCheckAndAuditAlarm
00000062  7DE90240  NtAccessCheckByType
00000056  7DE90114  NtAccessCheckByTypeAndAuditAlarm
00000063  7DE90258  NtAccessCheckByTypeResultList
00000064  7DE90270  NtAccessCheckByTypeResultListAndAuditAlarm
00000065  7DE90288  NtAccessCheckByTypeResultListAndAuditAlarmByHandle
00000066  7DE902A0  NtAddBootEntry
00000067  7DE902B8  NtAddDriverEntry
00000068  7DE902D0  NtAdjustGroupsToken
0000003E  7DE8FEC0  NtAdjustPrivilegesToken
0000006C  7DE9033C  NtAllocateReserveObject
0000006D  7DE90354  NtAllocateUserPhysicalPages
00000015  7DE8FAC0  NtAllocateVirtualMemory
0000006F  7DE90388  NtAlpcAcceptConnectPort
00000070  7DE903A0  NtAlpcCancelMessage
00000071  7DE903B8  NtAlpcConnectPort
00000072  7DE903D0  NtAlpcCreatePort
00000073  7DE903E8  NtAlpcCreatePortSection
00000074  7DE90400  NtAlpcCreateResourceReserve
00000075  7DE90418  NtAlpcCreateSectionView
00000076  7DE90430  NtAlpcCreateSecurityContext
00000077  7DE90448  NtAlpcDeletePortSection
00000078  7DE90460  NtAlpcDeleteResourceReserve
00000079  7DE90478  NtAlpcDeleteSectionView
0000007A  7DE90490  NtAlpcDeleteSecurityContext
0000007B  7DE904A8  NtAlpcDisconnectPort
0000007C  7DE904C0  NtAlpcImpersonateClientOfPort
0000007D  7DE904D8  NtAlpcOpenSenderProcess
0000007E  7DE904F0  NtAlpcOpenSenderThread
0000007F  7DE90508  NtAlpcQueryInformation
00000080  7DE90520  NtAlpcQueryInformationMessage
00000081  7DE90538  NtAlpcRevokeSecurityContext
00000082  7DE90550  NtAlpcSendWaitReceivePort
00000083  7DE90568  NtAlpcSetInformation
00000049  7DE8FFD4  NtApphelpCacheControl
00000002  7DE8F8D8  NtCallbackReturn
0000005A  7DE9017C  NtCancelIoFile
00000086  7DE905B8  NtCancelIoFileEx
00000087  7DE905D0  NtCancelSynchronousIoFile
0000000C  7DE8F9E0  NtClose
00000038  7DE8FE2C  NtCloseObjectAuditAlarm
00000088  7DE905E8  NtCommitComplete
00000089  7DE90600  NtCommitEnlistment
0000008A  7DE90618  NtCommitTransaction
0000008B  7DE90630  NtCompactKeys
0000008C  7DE90648  NtCompareTokens
0000008D  7DE90660  NtCompleteConnectPort
0000008F  7DE90694  NtConnectPort
00000040  7DE8FEF0  NtContinue
00000090  7DE906AC  NtCreateDebugObject
00000091  7DE906C4  NtCreateDirectoryObject
00000092  7DE906DC  NtCreateEnlistment
00000045  7DE8FF74  NtCreateEvent
00000093  7DE906F4  NtCreateEventPair
00000052  7DE900B4  NtCreateFile
00000094  7DE9070C  NtCreateIoCompletion
00000095  7DE90724  NtCreateJobObject
00000096  7DE9073C  NtCreateJobSet
0000001A  7DE8FB40  NtCreateKey
00000097  7DE90754  NtCreateKeyTransacted
00000098  7DE9076C  NtCreateKeyedEvent
00000099  7DE90784  NtCreateMailslotFile
0000009A  7DE9079C  NtCreateMutant
0000009B  7DE907B4  NtCreateNamedPipeFile
0000009C  7DE907CC  NtCreatePagingFile
0000009D  7DE907E4  NtCreatePort
0000009E  7DE907FC  NtCreatePrivateNamespace
0000009F  7DE90814  NtCreateProcess
0000004A  7DE8FFEC  NtCreateProcessEx
000000A0  7DE9082C  NtCreateProfile
000000A1  7DE90844  NtCreateProfileEx
000000A2  7DE9085C  NtCreateResourceManager
00000047  7DE8FFA4  NtCreateSection
000000A3  7DE90874  NtCreateSemaphore
000000A4  7DE9088C  NtCreateSymbolicLinkObject
0000004B  7DE90004  NtCreateThread
000000A5  7DE908A4  NtCreateThreadEx
000000A6  7DE908BC  NtCreateTimer
000000A7  7DE908D4  NtCreateToken
000000A8  7DE908EC  NtCreateTransaction
000000A9  7DE90904  NtCreateTransactionManager
000000AA  7DE9091C  NtCreateUserProcess
000000AB  7DE90934  NtCreateWaitablePort
000000AC  7DE9094C  NtCreateWorkerFactory
000000AE  7DE90980  NtDebugContinue
000000B0  7DE909B4  NtDeleteBootEntry
000000B1  7DE909CC  NtDeleteDriverEntry
000000B2  7DE909E4  NtDeleteFile
000000B3  7DE909FC  NtDeleteKey
000000B4  7DE90A14  NtDeleteObjectAuditAlarm
000000B5  7DE90A2C  NtDeletePrivateNamespace
000000B6  7DE90A44  NtDeleteValueKey
000000B7  7DE90A5C  NtDisableLastKnownGood
000000B8  7DE90A74  NtDisplayString
000000B9  7DE90A8C  NtDrawText
00000039  7DE8FE44  NtDuplicateObject
0000003F  7DE8FED8  NtDuplicateToken
000000BA  7DE90AA4  NtEnableLastKnownGood
000000BB  7DE90ABC  NtEnumerateBootEntries
000000BC  7DE90AD4  NtEnumerateDriverEntries
0000002F  7DE8FD4C  NtEnumerateKey
000000BD  7DE90AEC  NtEnumerateSystemEnvironmentValuesEx
000000BE  7DE90B04  NtEnumerateTransactionObject
00000010  7DE8FA40  NtEnumerateValueKey
000000BF  7DE90B1C  NtExtendSection
000000C0  7DE90B34  NtFilterToken
00000048  7DE8FFBC  NtFlushBuffersFile
000000C1  7DE90B4C  NtFlushInstallUILanguage
000000C4  7DE90B9C  NtFlushProcessWriteBuffers
000000C5  7DE90BB4  NtFlushVirtualMemory
000000C7  7DE90BE8  NtFreeUserPhysicalPages
0000001B  7DE8FB58  NtFreeVirtualMemory
000000C8  7DE90C00  NtFreezeRegistry
000000C9  7DE90C18  NtFreezeTransactions
000000CA  7DE90C30  NtGetContextThread
000000CD  7DE90C80  NtGetMUIRegistryInfo
000000CE  7DE90C98  NtGetNextProcess
000000CF  7DE90CB0  NtGetNextThread
000000D0  7DE90CC8  NtGetNlsSectionPtr
000000D1  7DE90CE0  NtGetNotificationResourceManager
000000D2  7DE90CF8  NtGetPlugPlayEvent
000000D3  7DE90D10  NtGetWriteWatch
000000D5  7DE90D44  NtImpersonateThread
000000D6  7DE90D5C  NtInitializeNlsFiles
000000D7  7DE90D74  NtInitializeRegistry
000000DA  7DE90DC4  NtIsUILanguageComitted
000000DB  7DE90DDC  NtListenPort
000000DC  7DE90DF4  NtLoadDriver
000000DD  7DE90E0C  NtLoadKey
000000DE  7DE90E24  NtLoadKey2
000000DF  7DE90E3C  NtLoadKeyEx
000000E0  7DE90E54  NtLockFile
000000E3  7DE90EA4  NtLockVirtualMemory
000000E6  7DE90EF4  NtMapCMFModule
00000025  7DE8FC50  NtMapViewOfSection
000000E8  7DE90F28  NtModifyBootEntry
000000E9  7DE90F40  NtModifyDriverEntry
000000EA  7DE90F58  NtNotifyChangeDirectoryFile
000000EB  7DE90F70  NtNotifyChangeKey
000000EC  7DE90F88  NtNotifyChangeMultipleKeys
000000ED  7DE90FA0  NtNotifyChangeSession
00000055  7DE900FC  NtOpenDirectoryObject
000000EE  7DE90FB8  NtOpenEnlistment
0000003D  7DE8FEA8  NtOpenEvent
000000EF  7DE90FD0  NtOpenEventPair
00000030  7DE8FD64  NtOpenFile
000000F0  7DE90FE8  NtOpenIoCompletion
000000F1  7DE91000  NtOpenJobObject
0000000F  7DE8FA28  NtOpenKey
000000F2  7DE91018  NtOpenKeyEx
000000F3  7DE91030  NtOpenKeyTransacted
000000F4  7DE91048  NtOpenKeyTransactedEx
000000F5  7DE91060  NtOpenKeyedEvent
000000F6  7DE91078  NtOpenMutant
000000F7  7DE91090  NtOpenObjectAuditAlarm
000000F8  7DE910A8  NtOpenPrivateNamespace
00000023  7DE8FC20  NtOpenProcess
000000F9  7DE910C0  NtOpenProcessToken
0000002D  7DE8FD18  NtOpenProcessTokenEx
000000FA  7DE910D8  NtOpenResourceManager
00000034  7DE8FDC8  NtOpenSection
000000FB  7DE910F0  NtOpenSemaphore
000000FC  7DE91108  NtOpenSession
000000FD  7DE91120  NtOpenSymbolicLinkObject
000000FE  7DE91138  NtOpenThread
00000021  7DE8FBF0  NtOpenThreadToken
0000002C  7DE8FD00  NtOpenThreadTokenEx
000000FF  7DE91150  NtOpenTimer
00000100  7DE91168  NtOpenTransaction
00000101  7DE91180  NtOpenTransactionManager
00000102  7DE91198  NtPlugPlayControl
0000005C  7DE901AC  NtPowerInformation
00000103  7DE911B0  NtPrePrepareComplete
00000104  7DE911C8  NtPrePrepareEnlistment
00000105  7DE911E0  NtPrepareComplete
00000106  7DE911F8  NtPrepareEnlistment
00000108  7DE9122C  NtPrivilegeObjectAuditAlarm
00000109  7DE91244  NtPrivilegedServiceAuditAlarm
0000010A  7DE9125C  NtPropagationComplete
0000010B  7DE91274  NtPropagationFailed
0000004D  7DE90038  NtProtectVirtualMemory
0000003A  7DE8FE5C  NtQueryAttributesFile
0000010D  7DE912A8  NtQueryBootEntryOrder
0000010E  7DE912C0  NtQueryBootOptions
00000032  7DE8FD98  NtQueryDirectoryFile
00000110  7DE912F4  NtQueryDirectoryObject
00000111  7DE9130C  NtQueryDriverEntryOrder
00000112  7DE91324  NtQueryEaFile
00000053  7DE900CC  NtQueryEvent
00000113  7DE9133C  NtQueryFullAttributesFile
00000114  7DE91354  NtQueryInformationAtom
00000115  7DE9136C  NtQueryInformationEnlistment
0000000E  7DE8FA10  NtQueryInformationFile
00000116  7DE91384  NtQueryInformationJobObject
00000117  7DE9139C  NtQueryInformationPort
00000016  7DE8FAD8  NtQueryInformationProcess
00000118  7DE913B4  NtQueryInformationResourceManager
00000022  7DE8FC08  NtQueryInformationThread
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