Execute Injected DLL code in another process

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Hey! So, i have a main application, a 3rd party app and a dll with code that when executed will msgbox("Yey"). How can i call the function in the dll from the main app when its injected into the 3rd party app? thank you :)

Posted 19-Aug-14 2:42am

Member 11017040

Updated 19-Aug-14 3:42am

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Kschuler 19-Aug-14 9:26am

What do you mean by "injects it into a process."? What exactly are you trying to do?

Member 11017040 19-Aug-14 9:31am

It injects the DLL's code into another process, but i dont know how to call the code.

Kschuler 19-Aug-14 9:34am

Call the code from where? The program that injected it? Or are you trying to get the program that you've injected the dll into to call it? Maybe you could just explain a bit more about what you are trying to do...because it sounds a bit shady.

Member 11017040 19-Aug-14 9:36am

I have a main application(my own), a 3rd party app and a dll. the dll has a function called "Testing" that when called is supposed to msgbox("Yey"), however i dont know how to call the function when the DLL is injected into the 3rd party app. Ive been sucsessfull in injecting it so its inside the app, but i have no idea how to call the functions.

Kschuler 19-Aug-14 9:39am

I've never done anything with injecting a DLL into another process, so I can't really help you. But you should click the Improve question link and add this information to your original question. It's much clearer with this information. And you'll be much more likely to get a response from someone who actually knows about these things. Good luck.

PhilLenoir 19-Aug-14 10:32am

What do you mean injected? Have you "hacked" the third party app, is there a mechanism in the app to configure a callout function or a hook or add-in? Do you want to call the function from your own code? Is there some macro language in the 3rd party application to call external libraries?

Member 11017040 19-Aug-14 10:39am

ive used a simple DLL injecter to innject the DLL code, kinda like loading a libary into your own app, except im the one to do it. However i need help to call the code.

Duncan Edwards Jones 19-Aug-14 13:08pm

We need a great deal more information:-
1) What did you write the DLL in (is it .NET or C/C++)
2) What is the third party application
3) Does the third party application have any plug-in model

Bottom line is that you can't force your code into another application and convince it to run it if the application was not designed with that in mind - you can probably understand why that is the case?

Member 11017040 19-Aug-14 14:57pm

I wrote a main sub that sends a message. in .NET
Currently Notepad
Nope,
and yes you can force something run code its not disigned to. thats the hole point of this. Kind of like how WoW and maplestory/hearthstone bots work, they inject a dll that can send specific commands inside the app and they communicate with the main app trhough IO.steamwrite/reader. however im not able to start the dll reader function because i dont know how to call the code externally

Duncan Edwards Jones 19-Aug-14 17:15pm

..but that is the whole point - you can't call the code externally, you have to convince the third party application to call it.

To use a metaphor - your "dll injection" is like you posted a note through your neighbours door. Now for that note to have an effect, you have to convince him/her to read it - you can't read it to him outside the door.

Sergey Alexandrovich Kryukov 19-Aug-14 15:30pm

Do you have any legitimate reason for injection of the code into an assembly? This is neither a standard nor civilized approach. If you think you really need it, you have to motivate it, at least explain your ultimate goals. Who would like to waste time on getting into tricky discussions with you, if it may appear that it makes no sense?
—SA

Member 11017040 19-Aug-14 16:29pm

Well, the reason why i would like to do it is because i think reverse engeneering it cool. And this is one of the basic ways to do it. My ultimate goal is to learn more about it and maybe even try to make a simple program that would just inject a dll that when a function is called enters a text in notepad(the app i injeced the dll in):

Sergey Alexandrovich Kryukov 19-Aug-14 16:36pm

I would love to know what do you consider "cool", but this is not my question. I also understand the learning can be the ultimate goal. Okay, what do you want to achieve with this very application, ultimately. Please, don't say that you want to achieve the use of injection; it would make rounds. What behavior of the application do you want to achieve?
By the way, please understand that re-using 3rd-party application is called "lame", not "cool". :-)
—SA

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Dave Kreskowiak · Answer 1 · 2014-08-19T09:48:00

Solution 1

Well, you have a problem. Managed code cannot be injected into a foreign process. Only unmanaged code supports that.

Posted 19-Aug-14 9:48am

Dave Kreskowiak

Comments

Sergey Alexandrovich Kryukov 19-Aug-14 16:37pm

5ed. I think the real OP's problem is the general goals and incentives for programming. Please see the recent comments. The beginner trying to get something "cool" because it is perceived as "cool" is most certainly wasting time.
—SA