private static ulong GetKernelBase()
{
ulong buffer;
uint bufferSize = 2048;
buffer = (ulong)Marshal.AllocHGlobal((int)bufferSize);
uint status = NT.NtQuerySystemInformation(11 /*SystemModuleInformation*/, buffer, (uint)bufferSize, out bufferSize);
if (status == 0xC0000004L /*STATUS_INFO_LENGTH_MISMATCH*/)
{
Marshal.FreeHGlobal((IntPtr)buffer);
buffer = (ulong)Marshal.AllocHGlobal((int)bufferSize);
status = NT.NtQuerySystemInformation(11 /*SystemModuleInformation*/, buffer, (uint)bufferSize, out bufferSize);
}
if (status != 0)
{
throw new Exception("GetKernelBase Failed");
}
NT._RTL_PROCESS_MODULES *modulesPointer = (NT._RTL_PROCESS_MODULES *)buffer;
return((ulong)modulesPointer->Modules.ImageBase);
}
public static void UpdateDynamicData()
{
NT._OSVERSIONINFOEXW osvi = new NT._OSVERSIONINFOEXW()
{
dwOSVersionInfoSize = (uint)Marshal.SizeOf(typeof(NT._OSVERSIONINFOEXW))
};
NT.RtlGetVersion(&osvi);
ulong versionLong = (osvi.dwMajorVersion << 16) | (osvi.dwMinorVersion << 8) | osvi.wServicePackMajor;
switch (versionLong)
{
case 0x060101 /*win 7*/:
g_IsWindows7Machine = true;
g_OffsetDirectoryTable = 0x028;
g_OffsetProcessId = 0x180;
g_OffsetProcessLinks = 0x188;
g_OffsetObjectTable = 0x200;
break;
case 0x060200 /*win 8*/:
case 0x060300 /*win 8.1*/:
g_OffsetDirectoryTable = 0x028;
g_OffsetProcessId = 0x2e0;
g_OffsetProcessLinks = 0x2e8;
g_OffsetObjectTable = 0x408;
break;
case 0x0A0000 /*win 10*/:
{
switch (osvi.dwBuildNumber)
{
case 10240:
case 10586:
case 14393:
g_OffsetDirectoryTable = 0x028;
g_OffsetProcessId = 0x2E8;
g_OffsetProcessLinks = 0x2F0;
g_OffsetObjectTable = 0x418;
break;
case 15063:
case 16299:
g_OffsetDirectoryTable = 0x028;
g_OffsetProcessId = 0x2E0;
g_OffsetProcessLinks = 0x2E8;
g_OffsetObjectTable = 0x418;
break;
default:
throw new Exception("Unsupported dwBuildNumber");
}
break;
}
default:
throw new Exception("Unsupported version_long");
}
}
private static byte *FindKernelProcedure(string szName)
{
ulong ntoskrnlHandle = NT.LoadLibrary("ntoskrnl.exe");
ulong kernelBase = GetKernelBase();
ulong functionPointer = NT.GetProcAddress(ntoskrnlHandle, szName);
return((byte *)(functionPointer - ntoskrnlHandle + kernelBase));
}