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#Lesson 4 - Creating functions
#Lesson 4 - Creating functions
As i explained before, GameHacking is simply modifying memory.
Now how do we modify the memory?
We first start with an unpacked version (what is unpacking? http://www.mpgh.net/forum/showthread.php?t=858325).
This unpacked file is opened in a debugger, i will open this in IDA Freeware 5.0 (because it's free for ever
).
The unpacked file will be posted below and can be downloaded after approval.
The beginning screen
We have just opened our unpacked WarRock file and we are now going to make a useable function out of it.
We are going to try to use the ingame message that shows when trying to buy premium weapons or winning an event.
WarRock provided us with plenty of stuff that we can start with.
For example: You got a XM8 (15 days) for the [Back to Bootcamp] event!
This opens up in a messagebox!
We want THIS messagebox, but with our text.
If we take a look in the unpacked version in IDA we can clearly see unencrypted text that's used in a MessageBox.
Now we go to that function
Only pay attention to the stuff inside the red boxes
You need to know a bit of assembly to understand this part.
We have all the stuff we need right here.
now what is what?
This code pushes our text, so we enter our text here, this will show our text in the messagebox
We call our function that displays the messagebox (adr: 0x41AEC7).
We pop the ecx register.
CALL SUB_41AEC7
This function is very important, it's the function we use to display our MessageBox!
As you can see it has some stuff in it, now how could this be a function?
We use the codes above to use this function.
As you see i have used the push, call and pop.
So now our function should work, let's try it!
WarRock Dumped 30-08-2014
Virustotal: https://www.virustotal.com/nl/file/1...is/1409670147/
Virscan: http://virusscan.jotti.org/nl/scanre...a44c19c0137962
I hope this makes any sence, if there are any questions feel free to ask them!
I'm not a pro at expressing myself..
Now how do we modify the memory?
We first start with an unpacked version (what is unpacking? http://www.mpgh.net/forum/showthread.php?t=858325).
This unpacked file is opened in a debugger, i will open this in IDA Freeware 5.0 (because it's free for ever
).The unpacked file will be posted below and can be downloaded after approval.
The beginning screen
We have just opened our unpacked WarRock file and we are now going to make a useable function out of it.
We are going to try to use the ingame message that shows when trying to buy premium weapons or winning an event.
WarRock provided us with plenty of stuff that we can start with.
For example: You got a XM8 (15 days) for the [Back to Bootcamp] event!
This opens up in a messagebox!
We want THIS messagebox, but with our text.
If we take a look in the unpacked version in IDA we can clearly see unencrypted text that's used in a MessageBox.
Now we go to that function
Only pay attention to the stuff inside the red boxes
You need to know a bit of assembly to understand this part.
We have all the stuff we need right here.
now what is what?
Code:
___:004E2D8B push offset aTheServerIsFul ; "\nThe server is full right now. \n\nPlease"...
Code:
___:004E2D90 call sub_41AEC7
Code:
___:004E2D98 pop ecx
CALL SUB_41AEC7
This function is very important, it's the function we use to display our MessageBox!
As you can see it has some stuff in it, now how could this be a function?
We use the codes above to use this function.
As you see i have used the push, call and pop.
So now our function should work, let's try it!
WarRock Dumped 30-08-2014
Virustotal: https://www.virustotal.com/nl/file/1...is/1409670147/
Virscan: http://virusscan.jotti.org/nl/scanre...a44c19c0137962
I hope this makes any sence, if there are any questions feel free to ask them!
I'm not a pro at expressing myself..
Originally Posted by Jhem
