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EasyHook/EasyHook

EasyHook - The reinvention of Windows API Hooking

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Jul 05 20:24

IvanJRCH opened #398
Apr 28 18:05

giesalabs commented #380
Apr 19 03:38

zhaokaixs opened #397
Apr 01 14:22

Nickert1337 edited #396
Apr 01 14:22

Nickert1337 opened #396
Mar 15 03:48

bwmaples commented #395
Mar 13 09:54

bwmaples commented #395
Mar 13 09:36

bwmaples commented #395
Mar 13 09:32

bwmaples commented #395
Mar 13 07:33

bwmaples commented #395
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bwmaples commented #395
Mar 13 07:29

bwmaples commented #395
Mar 13 07:25

bwmaples edited #395
Mar 13 07:21

bwmaples edited #395
Mar 13 07:16

spazzarama commented #395
Mar 13 07:10

bwmaples edited #395
Mar 13 07:09

bwmaples edited #395
Mar 13 07:07

bwmaples opened #395
Mar 11 15:18

violarulan commented #367
Mar 08 17:32

danyhm commented #366

Green-Wolf

@Green-Wolf

Thanks @spazzarama , much appreciated

Michael IV

@SasMaster1980_twitter

Hi All. Anybody here encountered any issues when using native C++ based on Windows SDK 10 (10.0.16299.0) ?

I filed an issue on the github page.What happens is that when I switch from 8.1 to 10 SDK the hook can't find its entry point in the hook DLL.

Justin Stenning

@spazzarama

@SasMaster1980_twitter worked fine for me with 10.0.15063.0, can you try that version (I don't have 10.0.16299.0 SDK installed yet)

@SasMaster1980_twitter I assume your native entry point looks something like:

extern "C" void declspec(dllexport) stdcall NativeInjectionEntryPoint(REMOTE_ENTRY_INFO inRemoteInfo);
void __stdcall NativeInjectionEntryPoint(REMOTE_ENTRY_INFO inRemoteInfo) {...

Michael IV

@SasMaster1980_twitter

Hmm, will try that version. Yeah, the hook entry point in my app looks like that.

Michael IV

@SasMaster1980_twitter

Well,weird stuff.Today tried it again with 10.0.16299.0 and with the 10.0.15063.0 - and it worked ok. No idea what was wrong. I was messing with this issue yesterday ,like, for 2 hours..

Shit

MechanicalPen

@MechanicalPen

I'm trying to use EasyHook .NET to hook a DLL. It works great except the function I am hooking takes a c++ std::string. I can't figure out how to even pass it back into the original function without it crashing. I tried void*, IntPtr. Any ideas?

MechanicalPen

@MechanicalPen

The original function is bool sf::SoundBuffer::loadFromFile ( const std::string & filename )

Justin Stenning

@spazzarama

@MechanicalPen what does your handler signature look like?

32-/64-bit?

MechanicalPen

@MechanicalPen

[UnmanagedFunctionPointer(CallingConvention.ThisCall, SetLastError = true, CharSet = CharSet.Unicode)] [return: MarshalAs(UnmanagedType.Bool)] unsafe delegate bool SmflAudio2_SoundBuffer_loadFromFile(void* filename);

32 bit.

MechanicalPen

@MechanicalPen

Here's the rest of the relevant code, in case it helps.

audioOpenFromFileAddress = LocalHook.GetProcAddress("sfml-audio-2.dll", "?openFromFile@InputSoundFile@sf@@QAE_NABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z");
            smfl_loadFromFile = Marshal.GetDelegateForFunctionPointer<SmflAudio2_SoundBuffer_loadFromFile>(audioOpenFromFileAddress);

unsafe bool SoundGetFromFileHook(void* filename)
{
   return smfl_loadFromFile(filename);
}

Justin Stenning

@spazzarama

@MechanicalPen try adding first param as IntPtr self as well (to store the this object). Filename can just be IntPtr also and no need for unsafe (unless you need it for another reason)

i.e.
[UnmanagedFunctionPointer(CallingConvention.ThisCall, SetLastError = true, CharSet = CharSet.Unicode)] [return: MarshalAs(UnmanagedType.Bool)] delegate bool SmflAudio2_SoundBuffer_loadFromFile(IntPtr self, IntPtr filename);

MechanicalPen

@MechanicalPen

@spazzarama Hey, that worked! So we need to store a pointer to the object when we hook a c++ object's method. (self points at the SoundBuffer in this case, correct?)

Justin Stenning

@spazzarama

@MechanicalPen correct

Jan Martin

@catmanjan

im having an issue hooking into the DoDragDrop event, if I return my own function it works in Firefox and IE, but for some reason I have to drag and drop twice to get chromium based browsers to accept my files - any ideas anyone?

Justin Stenning

@spazzarama

Is it hitting your hook each time?

@catmanjan If you have a very simple hook handler with just a call to the original does it still display the same behaviour?

Jan Martin

@catmanjan

@spazzarama yeah definitely, i believe the first drop is the original behavior - the issue is the original behavior of dropping from outlook to chrome is to reject the file so its hard to tell

it works fully in IE so i suspect a chromium issue, but i cant prove it

simon dimitriadis

@simonides

Hi can anyone help me with a hooked VirtualAlloc issue? I described it in more detail on stackoverflow. https://stackoverflow.com/questions/47844170/hooked-virtualalloc-returns-nullptr-when-called-by-system-dlls

simon dimitriadis

@simonides

Hi, is there an easy way through easyhook to call a function in an already injected dll, from the injector's process?

Justin Stenning

@spazzarama

@simonides EasyHook doesn't provide an IPC framework itself. If managed, .NET provides a number of IPC mechanisms for you (remoting etc). If unmanaged, just google to research the various IPC approaches available to you.

simon dimitriadis

@simonides

Already using pipes, thought there could an easy way in the lib :) Thank you.

Ari Seyhun

@tqwewe

Hello! Is EasyHook suited for memory hacking on Windows?

Justin Stenning

@spazzarama

@Acidic9 EasyHook does not provide any memory pattern search / patching tools. It does provide the ability to inject into a target.

simon dimitriadis

@simonides

Hi, I know how to hook VirtualAlloc but how would I hook operator new? Usual overwriting is not really an option.

Mateus Pimentel

@PimentelMateusw_twitter

someone knows if it's possible to hook native functions from a program? ( not DLL functions )

I want to hook this function:

but this did not work yet:

Already disabled ASLR btw

Mateus Pimentel

@PimentelMateusw_twitter

@spazzarama

Mateus Pimentel

@PimentelMateusw_twitter

nvm it worked now

MechanicalPen

@MechanicalPen

Does anyone have any tips or tricks for accessing a C++ std::string from the C# EasyHook? I'm hooking a method that takes a filename as an argument.

Justin Stenning

@spazzarama

@MechanicalPen what do you need to do with the string? Just read?

@MechanicalPen I THINK in the past I have written a helper structure for dealing with std::string (can't seem to find the code at the moment), but basically you should be able to analyse the memory structure and grab the std::string IntPtr and read into your structure with the help of Marshal.PtrToStringAnsi

MechanicalPen

@MechanicalPen

Yep, I just need to read the string to figure out which file it's trying to load.

putertubbie

@putertubbie

Question: Will having one hooked function calling another hooked function (NtQueryVirtualMemory seems to be calling NtClose internally and I have hooked both) lead to the deadlock I'm seeing? If so; is this due to the "Thread Deadlock Barrier" and, if so; is there anything I can do to work around this? Thanks!

Justin Stenning

@spazzarama

@putertubbie not sure that it would cause a deadlock, you can add individual threadId's to the exclusion list at any time if you would like to exclude a specific hook. You can also call the original function bypassing the hook: see LocalHookTest.cs - e.g. (BeepDelegate)Marshal.GetDelegateForFunctionPointer(lh.HookBypassAddress, typeof(BeepDelegate));

putertubbie

@putertubbie

@spazzarama Thanks for the reply! In this case the function NtQueryVirtualMemory seems to be calling NtClose through the process IAT, ending up in the NtClose hook. I'm wondering if this could cause the TDB to deadlock?

ArunPrasad777

@ArunPrasad777

Facing the following error, when trying to hook a dll.

Exception thrown at 0x0015ED74 in Target.exe: 0xC0000005: Access Violation executing location 0x0015ED74.
If there is a handler for this exception, the program may be safely continued.

What could be the possible reasons for this Access Violation error?

pheber

@pheber

Hi, I'm having an issue with hooking some 64 bit apis which apparently have an unsupported far jump at the beginning. Is there any way around this limitation? Could EasyHook be extended (by whomever :)) to support this or is there some theoretical reason why supporting it would be infeasible?

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