GautamGreat's GautamGreat

Author:
GautamGreat

Language:
C/C++

Upload:
2019-01-11 14:06

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Platform:
Windows

Difficulty:
2.0

Quality:
4.0

Arch:
x86

Downloads:
256

Size:
491.50 KB

Writeups:
2

Comments:
37

Description

Try to make a keygen, or fish a serial. Patching not allowed :D

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Comments (37)
Writeups (2)

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K2000 on 2019-01-14 23:15: I can patch it to jump to "You got it buddy!" but i can not find the correct serial. A video tutorial would be nice.

K2000 on 2019-01-19 23:25: [Click to reveal]

K2000 on 2019-01-19 23:26: [Click to reveal]

s4r on 2019-01-20 16:37: Dude you just have to disable Windows Defender and it'll works. Don't ask authors to reupload their crackmes

GautamGreat on 2019-01-21 12:52: [Click to reveal]

K2000 on 2019-01-21 19:27: Looks like the Windows serial numbers. Maybe that's why Windows Defender is blocking it. LOL

K2000 on 2019-01-22 03:15: How do i know which branches need to be taken in order to have a valid serial ? There are way too many branches.

K2000 on 2019-01-22 07:20: I tried your serials and single stepped through it with F7 but it crashed with an error. Is it because Windows Defender or it's something else ?

GautamGreat on 2019-01-22 10:36: Which debugger are you using?

K2000 on 2019-01-22 19:57: When it crashed i was using x32dbg. Then i tried ollydbg2 and it didn't crash. I think Windows Defender kicked in on it's own again. After being turned off for a while.

K2000 on 2019-01-22 20:34: It's completely stuck at address 004F2172. 004F2172 | 8A07 | mov al,byte ptr ds:[edi] It's either Windows Defender screwing around again or it's a bug in the program. All breakpoints were removed and it's still not running. In x32dbg. Running as Administrator. |

K2000 on 2019-01-22 20:47: Never mind my last post. I was debugging the wrong file.

K2000 on 2019-01-23 22:35: Single stepping through it with F7 in x32dbg gives Access Violation at 013BB236. 013BB236 | 396B D8 | cmp dword ptr ds:[ebx-28],ebp |

K2000 on 2019-01-23 22:42: Name: Alan Key : AAAAA-AAAAA-AAAAA-AAAAA-AAAAA Gives access violation at 013BB236. If you single step with F7 through it.

Anish on 2019-01-24 09:18: Gautam Great ur really great bro i need to learn lot of things from u will you tech me please..

GautamGreat on 2019-01-24 09:43: Seems problem with x32dbg, Use ollydbg instead, it is more stable.

K2000 on 2019-01-26 03:16: I can't find the serial number. This is not level 2. More like 4 or 5. Too advanced for me.

GautamGreat on 2019-01-26 10:12: I don't know the difficulty, admins should decide it.

ryancor on 2019-01-27 19:53: The only solution submitted was kind of bullshit, no proper write up, just giving some random DLL and EXE, that didn't even work. As for the challenge, it actually seems like a fun freakin challenge from what i've done with it so far but this isn't a level II, the amount functions used and algorithms needed to reverse for key checking alone makes this a III or IV. It would be really nice to see a write up on this kind of challenge though, don't know why this is not a thing for authors to post.

K2000 on 2019-01-28 02:41: [Click to reveal]

K2000 on 2019-01-28 02:57: [Click to reveal]

K2000 on 2019-01-28 03:04: Can you guys include the source codes for this ? Please ? Thank you in advance.

K2000 on 2019-01-28 03:57: [Click to reveal]

Anish on 2019-01-28 09:12: k2000 i challenge you bro to crack my software :D

Miracle5ky on 2019-01-28 10:25: I reverse the algorithm (but it is encrypted by HASH). I tried brute force by python, running more 30M times, still no solution. I wonder how it's works by injecting DLL.

K2000 on 2019-01-28 19:12: Anish , which one is your software bro ? Give me something simple to crack. This one is too advanced for me. They should include the source code in the solution so we can learn something.

Anish on 2019-01-29 12:28: k2000 mail me at : anishali34@gmail.com we discuss there

K2000 on 2019-01-29 22:10: Miracle5ky , can you make a video tutorial about cracking this using dll injection ? How do you code the dll injection ? The B3LYP key-gen works but he didn't include the source code or detailed explanations how to code it. Make a tutorial for noobs. I have a random key generator in C++ but i don't know how to inject it. Here is the code in C++.

K2000 on 2019-01-29 22:13: #include #include #include using namespace std; const int MAX = 36; string RandomString(int n) { char alphabet[MAX] = {'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' }; string res = ""; for (int i = 0; i

K2000 on 2019-01-29 22:17: How do i delete the last post because it's not displaying the C++ code correctly ?

K2000 on 2019-01-30 03:36: Can somebody explain how to inject my randomly generated key into the program's ? I managed to create a key generator in C++ but i have no clue how to inject the result from it into the program's . Thanks. |

MrFreez on 2019-04-05 20:52: patching is ok but too hard to keygen, any help to start a solution pls

AshVsEvilDead on 2019-04-08 20:18: GautamGreat, the code that generates the key is easy to find. And the code that generates name is easy to find. But the algorithm that relates the 2. This keygen is more than reverse engineering. There is boolean math. https://pastebin.com/ZZxWe5ME

GautamGreat on 2019-06-14 11:38: Hi, @321test123, Thanks for testing my keygen me challenge. You were right there was a little bug in code of addition and multiplication. You keygen took so much time to generate keys, which is kinda unacceptable.

GautamGreat on 2019-06-15 08:19: Nevermine I was trying it on python2, It is working pretty fast on Python3

jeffli6789 on 2026-01-04 06:25: This crackme had been reviewed when it was originally approved and is likely safe. Crackmes often get flagged by antivirus software, EDR systems, or VirusTotal because they may use the same protection techniques found in malware (packers, anti-debugging, self-modifying code, etc.), or simply a false positive. This does NOT mean the crackme is actually malicious. The only way to confirm whether something is truly malware is to reverse engineer it and find proof of malicious code and/or malicious behavior. If you still believe this is actual malware, please report it to us via email: crackmesone@gmail.com. **We encourage everyone to run crackmes in a VM (virtual machine) and exercise caution when executing unknown binaries.** *Disclaimer: We do our best to review submissions, but mistakes can happen. The administrators and crackmes.one cannot be held liable for any damages or losses resulting from the use of files downloaded from this site. Always exercise caution and use a sandboxed environment.*

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Solution by B3LYP on 2019-01-18 11:46:
Simple brute force solution based on a injected dll.

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Solution by 321test123 on 2019-05-10 18:49:
Keygen which is working quite good. Why not always? See last sentence in readme:)

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