public void Inject(InjectableProcess process, string dllPath, string typeName, string methodName)
{
bool x86 = !process.Is64Bit;
var clrVersion = GetClrVersion();
var bindToRuntimeAddr = GetCorBindToRuntimeExAddress(process.Pid, process.FullHandle, x86);
var callStub = CreateCallStub(process.FullHandle, dllPath, typeName, methodName, null, bindToRuntimeAddr, x86, clrVersion);
var hThread = CodeInjectionUtils.RunRemoteCode(process.FullHandle, callStub, x86);
Console.WriteLine("Thread handle: " + hThread.ToInt32().ToString("X8"));
}
private static IntPtr GetCorBindToRuntimeExAddress(uint pid, IntPtr hProc, bool x86)
{
var mods = NativeHelper.GetModules(pid);
var mod = mods.SingleOrDefault(x => x.moduleName.Equals("mscoree.dll", StringComparison.InvariantCultureIgnoreCase));
if (mod == default)
{
throw new Exception("Couldn't find MSCOREE.DLL, arch mismatch?");
}
int fnAddr = CodeInjectionUtils.GetExportAddress(hProc, mod.baseAddress, "CorBindToRuntimeEx", x86);
return(mod.baseAddress + fnAddr);
}
private static IReadOnlyList <Instruction> CreateCallStub(IntPtr hProc, string asmPath, string typeFullName, string methodName, string?args, IntPtr fnAddr, bool x86, string clrVersion)
{
const string buildFlavor = "wks"; // WorkStation
var ppv = alloc(IntPtr.Size);
var riid = allocBytes(iidIclrRuntimeHost.ToByteArray());
var rcslid = allocBytes(clsidClrRuntimeHost.ToByteArray());
var pwszBuildFlavor = allocString(buildFlavor);
var pwszVersion = allocString(clrVersion);
var pReturnValue = alloc(4);
var pwzArgument = allocString(args);
var pwzMethodName = allocString(methodName);
var pwzTypeName = allocString(typeFullName);
var pwzAssemblyPath = allocString(asmPath);
var c = new Assembler(x86 ? 32 : 64);
void AddCallReg(Register r, params object[] callArgs) => CodeInjectionUtils.AddCallStub(c, r, callArgs, x86);
void AddCallPtr(IntPtr fn, params object[] callArgs) => CodeInjectionUtils.AddCallStub(c, fn, callArgs, x86);
if (x86)
{
// call CorBindToRuntimeEx
AddCallPtr(fnAddr, pwszVersion, pwszBuildFlavor, (byte)0, rcslid, riid, ppv);
// call ICLRRuntimeHost::Start
c.mov(edx, __[ppv.ToInt32()]);
c.mov(eax, __[edx]);
c.mov(eax, __[eax + 0x0C]);
AddCallReg(eax, edx);
// call ICLRRuntimeHost::ExecuteInDefaultAppDomain
c.mov(edx, __[ppv.ToInt32()]);
c.mov(eax, __[edx]);
c.mov(eax, __[eax + 0x2C]);
AddCallReg(eax, edx, pwzAssemblyPath, pwzTypeName, pwzMethodName, pwzArgument, pReturnValue);
c.ret();
}
else
{
const int maxStackIndex = 3;
const int stackOffset = 0x20;
c.sub(rsp, stackOffset + maxStackIndex * 8);
// call CorBindToRuntimeEx
AddCallPtr(fnAddr, pwszVersion, pwszBuildFlavor, 0, rcslid, riid, ppv);
// call pClrHost->Start();
c.mov(rcx, ppv.ToInt64());
c.mov(rcx, __[rcx]);
c.mov(rax, __[rcx]);
c.mov(rdx, __[rax + 0x18]);
AddCallReg(rdx, rcx);
// call pClrHost->ExecuteInDefaultAppDomain()
c.mov(rcx, ppv.ToInt64());
c.mov(rcx, __[rcx]);
c.mov(rax, __[rcx]);
c.mov(rax, __[rax + 0x58]);
AddCallReg(rax, rcx, pwzAssemblyPath, pwzTypeName, pwzMethodName, pwzArgument, pReturnValue);
c.add(rsp, stackOffset + maxStackIndex * 8);
c.ret();
}
return(c.Instructions);
IntPtr alloc(int size, int protection = 0x04) => Native.VirtualAllocEx(hProc, IntPtr.Zero, (uint)size, 0x1000, protection);
void writeBytes(IntPtr address, byte[] b) => Native.WriteProcessMemory(hProc, address, b, (uint)b.Length, out _);
void writeString(IntPtr address, string str) => writeBytes(address, new UnicodeEncoding().GetBytes(str));
IntPtr allocString(string?str)
{
if (str is null)
{
return(IntPtr.Zero);
}
IntPtr pString = alloc(str.Length * 2 + 2);
writeString(pString, str);
return(pString);
}
IntPtr allocBytes(byte[] buffer)
{
IntPtr pBuffer = alloc(buffer.Length);
writeBytes(pBuffer, buffer);
return(pBuffer);
}
}