An Introduction to Revrerse Engineering - Reversing Winrar step by step

Hi folks,its been a long time since I have posted some thing technical,so I will be writing about the challenge I got at NITLearn to Crack any version of WinRAR – An Introduction to cracking KU, where I reverse engineered WinRAR 3.80 using a disassembler and will tell you the same here. Furthermore, major software are analysed using the same way,but just get a bit complex in the methodology. This tutorial is intended for those who are new to reverse engineering and disassembling.

Disclaimer – By Reading this tutorial You agree that this tutorial is intended for educational purposes only and the author can not be held liable for any kind of damages done whatsoever to your machine, or damages caused by some other,creative application of this tutorial.
In any case you disagree with the above statement,stop here.
The Tools
To perform this hack you will be needing -
  1. Any De-assembler (I use Hackers Disassembler and Hview )
  2. Resource Hacker
  3. A patch Creator ( Use Universal Patch Creator or Code fusion)
You will be able to get them by googling ..

How to Reverse Engineer?
You need to have a bit knowledge of assembly language,and in case you don't have it,just cram the steps and it will work anytime,every time. Download the latest version of WinRAR from their website and install it.
I will be cracking Winrar 3.80 here (cuz I already have it:P ). This is basically a 2 step process ( 4 step ,if you want to do things with a professional touch,period) .
Install WinRAR - www.theprohack.com
Now copy the WinRAR.exe file to desktop. Make a copy of it there.

Step 1 – Hunting for Memory Address
Now load Hackers Disasembler and load the copy in it.

Open Hackers Disassembler and load copy of Winrar in it - www.theprohack.com

The Disassembler will disassemble the executable in assembly code. Now you need to search for strings that are used in WinRAR program. Press Ctrl + F and type “evaluation” without quotes and search in the assembly code. Hit enter..

Reach this block of code using search function - www.theprohack.com

After you have reached this block of code by searching, just look at the block of code above it. There you will find that some assembly values are being compared and then code is jumped to some other function. Now see carefully, the “evaluation copy” function must be invoked after some specific condition is met. We need to look for it at the code and the make certain changes to the condition so that the program doesn't checks for the condition.

We need to edit this code,but first note memory address - www.theprohack.comWe need to edit this code,but first note memory address - www.theprohack.com
In the above code you can see this code -
00444B6A: 803DF4B84B0000 cmp byte ptr [004BB8F4], 00
00444B71: 0F859B000000 JNE 00444C12
This is the code responsible for validating you as a legal user :) . Just note down the memory address that leads to jump (JNE) at some memory location. In this case, note down 00444B71 .
Note : For any WinRAR version, this code and memory address might be different,but the JNE will be same. Just note down the respective memory address that checks.
Now you need to search for the code that brings that ugly nag screen “Please purchase WinRAR license” after your trial period of 40 days is over. For this,look over your toolbar and click on “D” which stands for looking for Dialog references.
Hit the D in toolbar - www.theprohack.com

Now in the dialog box that opens,search for “please” and you will get the reference as -
ID-REMINDER, “Please purchase WinRAR license”
Search in dialog references - www.theprohack.com

Double click on it and you will reach the subsequent code.

Note down the location of REMINDER dialog code - www.theprohack.com
The code will be something like
* String: “REMINDER”
0048731A: 68EB5E4B00 push 004B5EEB
Just note the memory address that invokes the REMINDER dialog. In this case its 0048731A. Note it down.
Note : For any WinRAR version, this code and memory address might be different.But the Reminder Memory address code will always PUSH something. Just note down the respective memory address that PUSH ‘s.


Step 2 – Fixing and Patching
Now in this step we will be patching up values of memory addresses we noted earlier. I will be doing this using HVIEW.
Now load the copy you disassembled in Hacker’s Disassembler in Hview.

Open HVIEW and open the EXE in it - www.theprohack.com

After you have loaded it, you will see the code is unreadable. Its just like opening an EXE file in notepad. You need to decode it. To do that, just press F4 and yoiu will get an option to decode it. Hit DECODE and you will be able to see code in the form of assembly code and memory addresses.

Decode the code by pressing F4- www.theprohack.com

After you have done that, you need to search for memory addresses you noted down earlier. Just hit F5 and a search box will be there. Now you need to enter the memory address. To do that, enter a “.” and the type memory address neglecting the earlier “00” . The “.” will suffice for “00”. ie -
Type .444B71 in place of 00444B71
search using F5 - www.theprohack.com

and search in the code.

reach the code - www.theprohack.com

After you have reached the respective code, you need to make changes to it. Press F3 and you will be able to edit the code.Now make the following changes -

Change the values- www.theprohack.com

After you have done it, save it by pressing F9.
Now search for next memory location by pressing F5 and entering it. Reach there and make the following changes by pressing F3 -

Offset patching - www.theprohack.com

Save the changes by pressing F9 and exit HVIEW by pressing F10.
Congrats..You have cracked WinRAR :) Replace the original WinRAR.exe with this copyofwinrar.exe by renaming it. It will work 100% fine :P

Step 3 – Spicing up the EXE
Now U have a 100% working version of EXE, you might want to change your registration information in WinRAR. TO do this, you can use Resource hacker.

We need to change registration info - www.theprohack.com

Launch Resource Hacker, load the copyofwinrar.exe in it

Use resource hacker and open the file - www.theprohack.com

Now go to DIALOG –> Expand tree –> ABOUTRARDLG and click it. Now Find Trial copy line and replace it with your favorite one :P

make changes and compile them - www.theprohack.com

and click on Compile Script button.

yup..thats the final result - www.theprohack.com

Now save the file with any name on your desktop or any location what so ever.

save your exe - www.theprohack.com

Now you have a fully patched WinRAR.exe file :)) . If you want to learn that, move on to next step.

Step 4 – Creating a working Patch (or giving Professional touch :P )
I will be using diablo2oo2's Universal Patcher (UPE) for creating the patch. The patch will work like any authentic one for that WinRAR version. Just like the one U downloaded at anytime of your life from any Crack and Keygen website.
Launch Patch Creator and click on add new project. Enter project Information and click on save.

Launch the patcher and setup it - www.theprohack.com

Click on Add – ; Offset patch


Create Offset patch - www.theprohack.com

After you have done that, double click on offset patch and then
  1. Give path of original winrar.exe
  2. Give path of unmodified Winrar.exe (again)
  3. Give path for fully patched Winrar.exe (ie Cracked Winrar.exe in this case)
  4. Click on compare and it will show difference between both files
  5. Click on save.
Compare executables - www.theprohack.com
Now in the next window, click on Create Patch and save it. The Patch will be created. Now copy it in WinRAR installation directory and hit on patch, it WILL work.

Create your patch - www.theprohack.com

Congrats you have created a patch of your own and have learned to reverse engineer WinRAR :)

Run the patch and it will work :) - www.theprohack.com

You can crack other software in the same way…just practice,debug and disassemble and you will get the way :)
[PS: The above is the long way to do it, I will be telling you the shortest way to crack WinRAR in just 1 step, the main aim of this tutorial was to introduce you to disassemblers and tools, and do some dirty work with your hand. ]
Cheers
XERO





7 Responses to “An Introduction to Revrerse Engineering - Reversing Winrar step by step”

Speicher3 said...
May 24, 2011 at 7:08 AM

Realy good manual, thx 4 that
but what about version 4.0

I think they changed the whole procedure. can you give some advice for a beginner?

thanks


Mugdha Fan said...
November 21, 2011 at 11:34 AM

i am unable to find evaluation , it says no text found ,please guide me what to do


Ameerfan said...
December 28, 2011 at 2:13 AM

wow..thanks bro..its useful for me


@:Ryan said...
January 22, 2012 at 3:19 PM

i think in 4.10 this will not work...i cant find the dialog box that push something


Anonymous said...
June 28, 2012 at 5:03 AM

you could have done all of it in resource hacker.
just saiyan


Unknown said...
November 27, 2012 at 4:03 AM

just get the corporate version, no patch needed.


Rishabh Dangwal said...
June 13, 2014 at 5:30 PM

click below link For WinRAR 5.10 Final With Key (32 & 64 bit)

WinRAR 5.10 Final With Key (32 & 64 bit)


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