| @nessuno: Awesome, i would love to watch it. Unfortunately it is private, can you make it public please? |
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| Thank you @Elvis for this excellent writeup and the effort you put into solving the crackme and documenting your solution! You covered all the key points, great job! |
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| Hey dyynkaa,
Nice job and thanks for working on my crackme! It's always cool to see different approaches!
That said, I just wanted to give a quick heads-up: the main goal I had in mind for this one was to unpack and decrypt it, with the bonus being to find a valid serial or write a keygen.
Your DLL injection + patching trick does get around it, but it kind of sidesteps the core challenge. I have not added loader or DLL injection detection, the idea was more to test reversing/unpacking skills than loading/dll injecting and patching.
Still, appreciate the time and effort you put in. Hope you will go for it again from the unpacking angle! |
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| I believe that many people like your crackme, I find it very entertaining! In case you wrote that because of the low quality rating: don't worry, I have the impression that there is sometimes a hater around who gives all crackmes bad ratings and also lowers the difficulty – it has happened to me too. If you look at the other crackmes: many of them suddenly received bad ratings overnight. Strange, right? It would be best if everyone would rate, then intentionally bad ratings wouldn't have such a big impact. When writing this you had a 2.5 quality rating which is disrespectful and inappropriate, i will give it an upvote! |
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| @CZ-DannyK: Thank you very much for your solution :) |
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| @dzwassim95:
Spoiler:
- the binary is not packed
- no anti patching checks |
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| @ nightxyz: The crackme works fine on your notebook, it is the expected behavior. You should finish reversing it on your notebook!
I don't know why it doesn't work on your desktop pc, i am sorry about that. |
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| @nightxyz : The behavior that the serial number does not work on your notebook is correct! Can you try debugging the crackme on your notebook? Because i dont understand the behavior on your desktop computer... |
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| @nightxyz : lets continue on discord, i cannot answer here without spoilers |
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| @nightxyz : Fully close the debugger, restart the exe and try again. |
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| @nightxyz : PS: If you figure it out, please let me know here but no spoilers please! |
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| @Oscar404 : Don't give up! :)
@nightxyz : The serial is not working, probably you have missed something ;) |
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| @Yanderome : Since no one has posted a comment here, I almost gave up: Is this Crackme too difficult after all? I’m all the more happy about your solution, thank you very much! It’s well-written and detailed, and you really understood every little detail. I’m very impressed with your reversing skills, as this is by far the hardest Crackme I’ve made so far. I’ll have to come up with something... |
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| @Everyone : Thank you for your comments and feedback :)
@Yanderome : Thanks for your solution, it was fun reading it! |
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| @Yanderome : Thanks a lot for your detailed solution! Very well written! |
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| @hacktooth : Thank you for uploading your solution, well done! |
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| The password is crackmes.one
Its in the faq section: https://crackmes.one/faq |
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| @Tokyo13377 : Just come to the crackmes.one discord channel, and ask your questions there or write me a pm! |
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| Good job @nightxyz. Are you also going to remove the dll? |
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| Well done everybody! And welcome back @CZ-DannyK, i also had a long break until last year! |
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| @Joshli: Unfortunately in this case the serial is not correct. You have to dig a bit deeper :) |
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| I am glad you like my crackme and thanks for submitting a solution! The webmaster will review it and release it, if it's ok... |
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| Spoiler:
@hacktooth:
I will give you 2 hints:
1.) You don't have to reverse the CRC32 algorithm
2.) Click the 'About' button and read the information carefully
|
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| Thank you for your feedback :) Are you going to write a solution? |
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| PS: Windows Defender returns a false positive. If you do not trust me, please use a VM for reversing the crackme. |
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| PS: Windows Defender returns a false positive. If you do not trust me, please use a VM for reversing the crackme. |
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| PS: Windows Defender returns a false positive. If you do not trust me, please use a VM for reversing the crackme. |
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| PS: The crackme has to be started from explorer.exe |
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| PS: Windows Defender returns a false positive due to my custom protection. If you do not trust me, please use a VM for reversing the crackme. |
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| I know, but what can i do? It's because protections often use similiar techniques as malware do.
You can either trust me, or use a vm to debug the crackme- |
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