downloadbrowsebenny2c's crackme.net #1

Download crackme.zip, 5 kb (password: crackmes.de)
Browse contents of crackme.zip

crackme.net #1
------------------

This is my first crackme so don't be disappointed :D

It is written in C#.net
(You will need the .net 2 framework installed to run this exe)

Objectives: (no patching or loaders)

-->make a keygen

Each key is only valid for one hour an one pc!

Difficulty: 2 - Needs a little brain (or luck)
Platform: Windows
Language: Unspecified/other

Published: 02. Nov, 2006
Downloads: 484

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Solutions

Solution by EsKiMo, published 04. jan, 2007; download (19 kb), password: crackmes.de or browse.

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Discussion and comments

emadicius
03. Nov 2006		don work in my pc, i have microsoft .net v2.0.50727 (spanish)

it display a messagebox saying no .net framework v2.0.50727
geeko
03. Nov 2006		install english version. It works on mine.
BTW, anyone knows how hash code is obtained?
kao
03. Nov 2006		Regarding GetHashCode(): http://blogs.msdn.com/brada/archive/2003/09/30/50396.aspx#50398
Meaning - keygen *should* be created in .NET 2.0 to work reliably. :)

@emadicius: can you tell me exact size/version of your mscorwks.dll ? Just curious. ;)
emadicius
03. Nov 2006		ups, i must admit that i dont have .net v2.0.50727 installed, i uninstalled but the folder remains empty

i suppose it works... i will try in other pc
Fatmike
04. Nov 2006		This is my keygencode, but your crackme doesnt accept the code. dunno why.

if (this.textBox5.Text.Length < 4)
{
MessageBox.Show("Name must at least be 4 characters long!", "crackme #1");
}
else
{
textBox1.Text = string.Format("{0:x}", "CRACKMEFORCRACKMES.DE".GetHashCode() | this.textBox5.Text.GetHashCode()).ToUpper();
textBox2.Text = string.Format("{0:x}", Dns.GetHostName().GetHashCode() | this.textBox5.Text.GetHashCode()).ToUpper();
textBox3.Text = string.Format("{0:x}", DateTime.Now.Hour.ToString().GetHashCode() | this.textBox5.Text.GetHashCode()).ToUpper();
textBox4.Text = string.Format("{0:x}", DateTime.Now.Date.ToString().GetHashCode() | this.textBox5.Text.GetHashCode()).ToUpper();
}
kch0pa
05. Nov 2006		easy, run reflector, button click rip the code.
geeko
06. Nov 2006		Fatmike: from microsoft:
"Furthermore, the .NET Framework does not guarantee the default implementation of the GetHashCode method, and the value it returns will be the same between different versions of the .NET Framework. Consequently, the default implementation of this method must not be used as a unique object identifier for hashing purposes."
So u have to have exaclty the same version of .NET

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