How to run an executable directly from memory?

[Blank-c]

I have an executable's bytes stored in a bye array, and I'd like to execute the executable, without storing it on user's disk unless they buy the license.

Why am I not using the temp folder?

If I extract the file in the temp folder and while its still running, anyone can just copy it to a place and my program would not delete it after running. What should I do?

I don't want to use licencing method, etc.

[JalonSolov]

That's going to require digging into the "guts" of the OS... and it'll be different for every OS. It's also a "good" way to carry a virus payload as part of your program.

[Blank-c]

Lets try not make random assumptions and answer truely. I still need this, do you know how to accomplish this task for windows?

[bogen85]

I had to reread your initial post to understand what you are asking for, as a casual reading made me think you were trying to bypass someone else's licensing... (rather than enforce your own). So please forgive any suspicions on our part. However, I will try to answer your question.

[Wajinn]

Lets try not make random assumptions and answer truely. I still need this, do you know how to accomplish this task for windows?

Blank-Grabber Public
A trojan written in python 3 and packed with a whole lot of features...

People might be making this assumption based on some of your repositories. As in you might be fishing for ways to build better trojans. If that's what you are doing, probably better to do the research on your own, than to take advantage of unsuspecting good programmers that are not about that life.

[Blank-c]

Lets try not make random assumptions and answer truely. I still need this, do you know how to accomplish this task for windows?

Blank-Grabber Public A trojan written in python 3 and packed with a whole lot of features...

People might be making this assumption based on some of your repositories. As in you might be fishing for ways to build better trojans. If that's what you are doing, probably better to do the research on your own, than to take advantage of unsuspecting good programmers that are not about that life.

Nah, I am not doing it for that.

[bogen85]

Please read all of what I'm writing here before jumping making any random assumptions of what I am saying (or about what @JalonSolov already said)

Disclaimer:

1. I'll assume you are legitimately asking for a way to enforce licensing on software you hope to sell to potential customers.
2. My opinion of non-FOSS is not an issue: To enforce licensing on software you hope to sell to potential customers is OK if that is what you want to do. (so I'm not disputing whether or not that is acceptable, that is totally up to you).

That being said, I'll attempt to answer your question.

What you are asking for would be very difficult with normal executable files

1. You would likely have to implement your own PE loader and executor. This would be very difficult to make it work on all versions/flavors of Windows running on the computers of your potential customers.
2. It would be easier (relatively easier, but still complex) to use a modified executable payload. But that is non trivial, as it would still have to do a lot what specific PE loaders/executors for Windows versions/flavors have to do.

But here is the problem... (and is what @JalonSolov alluded to) if any anti-malware solution is running the system there is good chance it will see what you are doing, and halt and quarantine whatever launcher app tried to do that. If it does not do that, then I would question the worthiness of said anti-malware solution.

Why? Because #1 and #2 above is what malware does to load and run virus payloads. So as far as the anti-malware solution is concerned, if it is any good, it will assume your application is malware.

So, no. Neither @JalonSolov nor I are making random assumptions. Both of us have answered your question truely based on how you asked it..

But I can see how it would come across that way to you (that we are making random assumptions).

But this is 2022, not 1962. :)

What you essentially asked us is:
How can write I malware in V to load and run a virus payload?

Even if that is not your intent (and as I already said I'll give you the benefit of the doubt that is not your intent).

Why? Because like I said at the onset you are asking for is essentially for a way to enforce your own licensing for software you own. And there might be other ways of doing that without doing what malware does to load and run viruses.

[bogen85]

TLDR on my above reply.

Don't ask how to write malware.
Don't word your questions to make them sound like you are asking us how to write malware.

[bogen85]

But this is 2022, not 1962. :)

In case you did not know I meant by that:

We are in the computing world of 2022. (Where cybersecurity is a high priority).
We are not in the computing world of 1962. (Apart from maybe some Cold War issues, cybersecurity was likely not on the radar of most).

[Blank-c]

¯\_(ツ)_/¯

Can you tell me why do some functions require ? or ! or or {} at the end??

[spytheman]

@Blank-c, go find yourself another hobby, troll.

[Blank-c]

What can I do? I just started vlang yesterday and didn't find any good way to learn

[spytheman]

How about reading https://github.com/vlang/v/blob/master/doc/docs.md ?

[Blank-c]

tried, but I didn't understand the ? and ! part.

[spytheman]

It is explained in the https://github.com/vlang/v/blob/master/doc/docs.md#optionresult-types-and-error-handling section.

TLDR: use !Type as the result type of a function that can return an error, instead of a normal value, or ?Type for a function that can return none instead of a normal value.

Using single ! or ? at the end of function calls, means that you do not care to handle the error/none values right away, instead you delegate/propagate their handling to the function that called your current one.

[Blank-c]

oh got it