How To Crack Programs Yourself with Offset Comparison Tool

Software cracking groups have been around for a long time. Many people will think that they are unethical because they are defeating the software licensing system to illegally reset a trial software (shareware) or turn it into an fully functional program without having to purchase the license. One may wonder the reason for doing this but most of the time it is not for monetary gain but as a challenge to know how “it works” and to gain more knowledge through unpacking, debugging and analyzing the program. The cracks that are being released to the public are a proof of concept for a specific version and they don’t normally re-crack it again when a new version of the program is released.

Knowing how to crack a program using an available ready made patch, keygenerator or cracked files does not earn yourself the title “software cracker”. Only if you are able to think out of the box and figure out how to bypass the software protection yourself, then you consider yourself as a software cracker. Unfortunately it is nearly impossible to have someone to teach or coach you on how to crack programs other than learning it yourself from cracking tutorials that can be found in YouTube.

Before checking out the advanced cracking tutorials, we can show you a very basic and logical method on how to crack programs yourself based on an old patch that does not work with the latest version. For example, an offset patcher for a program called ViceVersa Pro v2.5 build 2512 released on 3 July 2013 by Nemo from team SnD will not work for the current version 2.5 build 2513 (notice the difference in the build number). The patcher reports “wrong filesize or already patched!”

Wrong Filesize or Already Patched

It is possible that the software protection isn’t updated to prevent the patcher from working, but the patcher did not work with the latest version because the program was recompiled, moving the location of the bytes that the patcher supposed to change and failing the CRC32 check. Here is how to detect which bytes are being changed by the patcher and how to re-create a new patcher that could work for the latest version. 1. First you will need to search, download and install the older version of ViceVersa Pro v2.5 build 2512.

2. Then search and use to patch the program, with the “Make Backup” checkbox ticked.

3. Download dUP2, extract the RAR file with an archiver and run dup2.exe.

4. Click on Project menubar and select New.

5. It is optional to fill up the information in the Patch Info window so that the GUI of the patcher will contain the text rather than blank. Or you can just click the Save button to continue. It is advisable to tick the “Run patch with administrator rights” checkbox because most of the time you’ll need to run the patch from the Program Files directory and it will fail to patch if you do not run it as admin.

dUP2 Patch Info

6. Right click on an empty space in dUP2, hover on Add and select [Search and Replace Patch].

Search and Replace Patch

7. You’ll notice that [Search and Replace Patch] will appear in the Patch Script window. Double click on it to open up a new Search and Replace Patch window.

8. Click compare files button.

9. Now you’ll need to select the original and patch file for the compare module to check for the location of the bytes that was changed by the patcher. Most of the time the original file will have an additional .bak extension at the end while the patched file will be the program’s original file name. Click the Compare button once you’ve selected both the original and patched file.

Compare Files Original and Patched

10. Click OK button to close the comparison done popup. You may see one or a few lines being added to search pattern and replace pattern. Click on the browse button to select the Target File that you want to patch. Click Save.

Search and Replace Pattern

Important Note: You should only see a few search and replace patterns added to the list and not too many until the dUP2 program hangs. If there’s too many, you may have selected the wrong original or patched file for comparison.

11. The final step is to create your own patch by clicking the Project menu bar, select Create Patch and save it to your hard drive.

dUP2 Create Patch

12. You can now install the latest version of ViceVersa Pro v2.5 build 2513. After installation has been completed, copy the patch that you’ve created with dUP2 to the program’s folder, run it and click the Patch button. This time you should see the message “File Patched! OK”.

File Patched

13. The patch that you created works! As you can see from the screenshot below, the program is now licensed instead of using the evaluation period.

ViceVersa licensed

Remember, the method shown above will work if the software protection is unchanged and provided if you are still able to find the older version of the program which the old patch works on.

Final note: You may have noticed that the patcher created by dUP2 is being detected as a virus by some antivirus software but dUP2 program itself is not detected. Rest assured that both dUP2 and the patcher created by it are free from virus. Think about this, if dUP2 is capable of creating a virus, shouldn’t the antivirus have detected dUP2 as virus too?

Disclaimer: This article is for educational purposes only and we do not encourage software cracking. The software ViceVersa Pro was used as an example in this article and we do not have intention of cracking it. If you find that a shareware is really helpful, you should purchase a license to support the author for them to continue improving it.

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