private static void PatchImports(PortableExecutable image, IntPtr hProcess, int processId)
{
string empty = string.Empty;
string empty2 = string.Empty;
foreach (IMAGE_IMPORT_DESCRIPTOR current in image.EnumImports())
{
if (image.ReadString((long)((ulong)image.GetPtrFromRVA(current.Name)), SeekOrigin.Begin, out empty, -1, null))
{
IntPtr intPtr = IntPtr.Zero;
IntPtr arg_4F_0 = IntPtr.Zero;
intPtr = ManualMap.GetRemoteModuleHandle(empty, processId);
if (intPtr.IsNull())
{
throw new FileNotFoundException(string.Format("Unable to load dependent module '{0}'.", empty));
}
uint num = image.GetPtrFromRVA(current.FirstThunkPtr);
uint num2 = (uint)Marshal.SizeOf(typeof(IMAGE_THUNK_DATA));
IMAGE_THUNK_DATA iMAGE_THUNK_DATA;
while (image.Read <IMAGE_THUNK_DATA>((long)((ulong)num), SeekOrigin.Begin, out iMAGE_THUNK_DATA) && iMAGE_THUNK_DATA.u1.AddressOfData > 0u)
{
IntPtr intPtr2 = IntPtr.Zero;
object obj;
if ((iMAGE_THUNK_DATA.u1.Ordinal & 2147483648u) == 0u)
{
if (!image.ReadString((long)((ulong)(image.GetPtrFromRVA(iMAGE_THUNK_DATA.u1.AddressOfData) + 2u)), SeekOrigin.Begin, out empty2, -1, null))
{
throw image.GetLastError();
}
obj = empty2;
}
else
{
obj = (ushort)(iMAGE_THUNK_DATA.u1.Ordinal & 65535u);
}
if (!(intPtr2 = WinAPI.GetModuleHandleA(empty)).IsNull())
{
IntPtr ptr = obj.GetType().Equals(typeof(string)) ? WinAPI.GetProcAddress(intPtr2, (string)obj) : WinAPI.GetProcAddress(intPtr2, (uint)((ushort)obj & 65535));
if (!ptr.IsNull())
{
intPtr2 = intPtr.Add((long)ptr.Subtract((long)intPtr2.ToInt32()).ToInt32());
}
}
else
{
intPtr2 = WinAPI.GetProcAddressEx(hProcess, intPtr, obj);
}
if (intPtr2.IsNull())
{
throw new EntryPointNotFoundException(string.Format("Unable to locate imported function '{0}' from module '{1}' in the remote process.", empty2, empty));
}
image.Write <int>((long)((ulong)num), SeekOrigin.Begin, intPtr2.ToInt32());
num += num2;
}
}
}
}
/*
* Handles loading of all dependent modules. Iterates the IAT entries and attempts to load (using LoadLibrary) all
* of the necessary modules for the main module to function. The manifest is extracted and activation contexts used to
* ensure correct loading of Side-By-Side dependencies.
*/
private static bool LoadDependencies(PortableExecutable image, IntPtr hProcess, int processId)
{
List <string> neededDependencies = new List <string>();
string curdep = string.Empty;
bool success = false;
foreach (var desc in image.EnumImports())
{
if (image.ReadString(image.GetPtrFromRVA(desc.Name), SeekOrigin.Begin, out curdep) && !string.IsNullOrEmpty(curdep))
{
if (GetRemoteModuleHandle(curdep, processId).IsNull())
{
neededDependencies.Add(curdep);
}
}
}
if (neededDependencies.Count > 0) //do we actually need to load any new modules?
{
byte[] bManifest = ExtractManifest(image);
string pathManifest = string.Empty;
if (bManifest == null) // no internal manifest, may be an external manifest or none at all?
{
if (!string.IsNullOrEmpty(image.FileLocation) && File.Exists(Path.Combine(Path.GetDirectoryName(image.FileLocation), Path.GetFileName(image.FileLocation) + ".manifest")))
{
pathManifest = Path.Combine(Path.GetDirectoryName(image.FileLocation), Path.GetFileName(image.FileLocation) + ".manifest");
}
else // no internal or external manifest, presume no side-by-side dependencies.
{
var standard = InjectionMethod.Create(InjectionMethodType.Standard);
var results = standard.InjectAll(neededDependencies.ToArray(), hProcess);
foreach (var result in results)
{
if (result.IsNull())
{
return(false); // failed to inject a dependecy, abort mission.
}
}
return(true); // done loading dependencies.
}
}
else
{
pathManifest = Utils.WriteTempData(bManifest);
}
if (string.IsNullOrEmpty(pathManifest))
{
return(false);
}
IntPtr pResolverStub = WinAPI.VirtualAllocEx(hProcess, IntPtr.Zero, (uint)RESOLVER_STUB.Length, 0x1000 | 0x2000, 0x40);
IntPtr pManifest = WinAPI.CreateRemotePointer(hProcess, Encoding.ASCII.GetBytes(pathManifest + "\0"), 0x04);
IntPtr pModules = WinAPI.CreateRemotePointer(hProcess, Encoding.ASCII.GetBytes(string.Join("\0", neededDependencies.ToArray()) + "\0"), 0x04);
if (!pResolverStub.IsNull())
{
var resolverStub = (byte[])RESOLVER_STUB.Clone();
uint nBytes = 0;
// Call patching. Patch the empty function addresses with the runtime addresses.
BitConverter.GetBytes(FN_CREATEACTCTXA.Subtract(pResolverStub.Add(0x3F)).ToInt32()).CopyTo(resolverStub, 0x3B);
BitConverter.GetBytes(FN_ACTIVATEACTCTX.Subtract(pResolverStub.Add(0x58)).ToInt32()).CopyTo(resolverStub, 0x54);
BitConverter.GetBytes(FN_GETMODULEHANDLEA.Subtract(pResolverStub.Add(0x84)).ToInt32()).CopyTo(resolverStub, 0x80);
BitConverter.GetBytes(FN_LOADLIBRARYA.Subtract(pResolverStub.Add(0x92)).ToInt32()).CopyTo(resolverStub, 0x8E);
BitConverter.GetBytes(FN_DEACTIVATEACTCTX.Subtract(pResolverStub.Add(0xC8)).ToInt32()).CopyTo(resolverStub, 0xC4);
BitConverter.GetBytes(FN_RELEASEACTCTX.Subtract(pResolverStub.Add(0xD1)).ToInt32()).CopyTo(resolverStub, 0xCD);
// Parameter patching
BitConverter.GetBytes(pManifest.ToInt32()).CopyTo(resolverStub, 0x1F);
BitConverter.GetBytes(neededDependencies.Count).CopyTo(resolverStub, 0x28);
BitConverter.GetBytes(pModules.ToInt32()).CopyTo(resolverStub, 0x31);
if (WinAPI.WriteProcessMemory(hProcess, pResolverStub, resolverStub, resolverStub.Length, out nBytes) && nBytes == (uint)resolverStub.Length)
{
uint result = WinAPI.RunThread(hProcess, pResolverStub, 0, 5000);
success = (result != uint.MaxValue && result != 0);
}
// Cleanup
WinAPI.VirtualFreeEx(hProcess, pModules, 0, 0x8000);
WinAPI.VirtualFreeEx(hProcess, pManifest, 0, 0x8000);
WinAPI.VirtualFreeEx(hProcess, pResolverStub, 0, 0x8000);
}
}
return(success);
}
private static void PatchImports(PortableExecutable image, IntPtr hProcess, int processId)
{
string module = string.Empty;
string fname = string.Empty;
foreach (var desc in image.EnumImports())
{
if (image.ReadString(image.GetPtrFromRVA(desc.Name), SeekOrigin.Begin, out module))
{
IntPtr pModule = IntPtr.Zero;
IntPtr tModule = IntPtr.Zero;
//Thanks to FastLoadDependencies, all dependent modules *should* be loaded into the remote process already.
pModule = GetRemoteModuleHandle(module, processId);
if (pModule.IsNull())
{
throw new FileNotFoundException(string.Format("Unable to load dependent module '{0}'.", module));
}
//now have a supposedly valid module handle remote process, all that remains to be done is patch the info.
uint pThunk = image.GetPtrFromRVA(desc.FirstThunkPtr); //despite the fact FirstThunk and OriginalFirstThunk are identical within an unmapped PE, only FirstThunk is looked up after mapping.
uint szThunk = (uint)Marshal.SizeOf(typeof(IMAGE_THUNK_DATA));
IMAGE_THUNK_DATA thunk;
while (image.Read(pThunk, SeekOrigin.Begin, out thunk) && thunk.u1.AddressOfData > 0) //final thunk is signified by a null-filled IMAGE_THUNK_DATA structure.
{
IntPtr remote = IntPtr.Zero;
object procVal = null;
if ((thunk.u1.Ordinal & 0x80000000) == 0) //import by name
{
if (image.ReadString(image.GetPtrFromRVA(thunk.u1.AddressOfData) + 2, SeekOrigin.Begin, out fname)) //get the function name.
{
procVal = fname;
}
else
{
throw image.GetLastError(); //error occurred during memory iteration, this is only a safeguard and shouldn't really ever occur, but the universe loves proving me wrong.
}
}
else //import by ordinal.
{
procVal = (ushort)(thunk.u1.Ordinal & 0xFFFF);
}
// the following section of code simply aims to reduce overhead. A check is first performed to see if the current module
// is loaded in the current process first, if so it simply uses relative addresses to calculate the function address in the remote
// process. If the module isn't found in our process, a call to GetProcAddressEx is used to find the remote address. Of course, you
// could simply guarantee the first case by calling LoadLibrary internally, but I find that can have unwanted side effects.
if (!(remote = WinAPI.GetModuleHandleA(module)).IsNull())
{
IntPtr local = procVal.GetType().Equals(typeof(string))
? WinAPI.GetProcAddress(remote, (string)procVal)
: WinAPI.GetProcAddress(remote, (uint)((ushort)procVal) & 0x0000FFFF);
if (!local.IsNull())
{
remote = pModule.Add(local.Subtract(remote.ToInt32()).ToInt32());
}
}
else
{
remote = WinAPI.GetProcAddressEx(hProcess, pModule, procVal);
}
if (remote.IsNull()) //alas, couldn't find the function.
{
throw new EntryPointNotFoundException(string.Format("Unable to locate imported function '{0}' from module '{1}' in the remote process.", fname, module));
}
image.Write <int>(pThunk, SeekOrigin.Begin, remote.ToInt32()); //overwrite the thunk and continue on our merry way.
pThunk += szThunk;
}
}
}
}
// Token: 0x06000123 RID: 291 RVA: 0x0000DEE4 File Offset: 0x0000C0E4
private static bool LoadDependencies(PortableExecutable image, IntPtr hProcess, int processId)
{
List <string> list = new List <string>();
string empty = string.Empty;
bool result = false;
foreach (IMAGE_IMPORT_DESCRIPTOR image_IMPORT_DESCRIPTOR in image.EnumImports())
{
if (image.ReadString((long)((ulong)image.GetPtrFromRVA(image_IMPORT_DESCRIPTOR.Name)), SeekOrigin.Begin, out empty, -1, null) && !string.IsNullOrEmpty(empty) && ManualMap.GetRemoteModuleHandle(empty, processId).IsNull())
{
list.Add(empty);
}
}
if (list.Count > 0)
{
byte[] array = ManualMap.ExtractManifest(image);
string text = string.Empty;
if (array == null)
{
if (string.IsNullOrEmpty(image.FileLocation) || !File.Exists(Path.Combine(Path.GetDirectoryName(image.FileLocation), Path.GetFileName(image.FileLocation) + ".manifest")))
{
InjectionMethod injectionMethod = InjectionMethod.Create(InjectionMethodType.Standard);
IntPtr[] array2 = injectionMethod.InjectAll(list.ToArray(), hProcess);
foreach (IntPtr ptr in array2)
{
if (ptr.IsNull())
{
return(false);
}
}
return(true);
}
text = Path.Combine(Path.GetDirectoryName(image.FileLocation), Path.GetFileName(image.FileLocation) + ".manifest");
}
else
{
text = Utils.WriteTempData(array);
}
if (string.IsNullOrEmpty(text))
{
return(false);
}
IntPtr intPtr = WinAPI.VirtualAllocEx(hProcess, IntPtr.Zero, (uint)ManualMap.RESOLVER_STUB.Length, 12288, 64);
IntPtr lpAddress = WinAPI.CreateRemotePointer(hProcess, Encoding.ASCII.GetBytes(text + "\0"), 4);
IntPtr lpAddress2 = WinAPI.CreateRemotePointer(hProcess, Encoding.ASCII.GetBytes(string.Join("\0", list.ToArray()) + "\0"), 4);
if (!intPtr.IsNull())
{
byte[] array4 = (byte[])ManualMap.RESOLVER_STUB.Clone();
uint num = 0u;
BitConverter.GetBytes(ManualMap.FN_CREATEACTCTXA.Subtract(intPtr.Add(63L)).ToInt32()).CopyTo(array4, 59);
BitConverter.GetBytes(ManualMap.FN_ACTIVATEACTCTX.Subtract(intPtr.Add(88L)).ToInt32()).CopyTo(array4, 84);
BitConverter.GetBytes(ManualMap.FN_GETMODULEHANDLEA.Subtract(intPtr.Add(132L)).ToInt32()).CopyTo(array4, 128);
BitConverter.GetBytes(ManualMap.FN_LOADLIBRARYA.Subtract(intPtr.Add(146L)).ToInt32()).CopyTo(array4, 142);
BitConverter.GetBytes(ManualMap.FN_DEACTIVATEACTCTX.Subtract(intPtr.Add(200L)).ToInt32()).CopyTo(array4, 196);
BitConverter.GetBytes(ManualMap.FN_RELEASEACTCTX.Subtract(intPtr.Add(209L)).ToInt32()).CopyTo(array4, 205);
BitConverter.GetBytes(lpAddress.ToInt32()).CopyTo(array4, 31);
BitConverter.GetBytes(list.Count).CopyTo(array4, 40);
BitConverter.GetBytes(lpAddress2.ToInt32()).CopyTo(array4, 49);
if (WinAPI.WriteProcessMemory(hProcess, intPtr, array4, array4.Length, out num) && num == (uint)array4.Length)
{
uint num2 = WinAPI.RunThread(hProcess, intPtr, 0u, 5000);
result = (num2 != uint.MaxValue && num2 != 0u);
}
WinAPI.VirtualFreeEx(hProcess, lpAddress2, 0, 32768);
WinAPI.VirtualFreeEx(hProcess, lpAddress, 0, 32768);
WinAPI.VirtualFreeEx(hProcess, intPtr, 0, 32768);
}
}
return(result);
}
