[KeyGenME] .NET CrackME/KeyGenME

[SHADOW_UA]

Not a difficult one keygenme/crackme written in C#.

Gold - write a keygen

Silver - find a valid Name-Key

Bronze - patch assembly and get Good boy message

KeyGenME_SHADOW.rar

[kao]

Very nice!

Attached is KG and uncommented source. But you must understand how this keygenme works - otherwise the source won't make any sense to you.

KG_KeyGenME_SHADOW.zip

 

EDIT: Merry Christmas everyone! Enjoy this time with your family...

Edited December 24, 2015 by kao

[SHADOW_UA]

6 minutes ago, kao said:

Very nice!

Attached is KG and uncommented source. But you must understand how this keygenme works - otherwise the source won't make any sense to you.

KG_KeyGenME_SHADOW.zip

 

EDIT: Merry Christmas everyone! Enjoy this time with your family...

Nice, kao! Deserved gold

[turissssst]

Bronze =(

KeygenME--.exe

[Guest greenbite]

Hello.

I tried out this keygenme. So it is executing shellcode, which would display the good boy message.
The shellcode is decrypted with hard-coded key; some bytes are replaced with other bytes generated from the name/serial combo, a check is done 

and finally executed. 

So it is possible to have certain name/serial combo to pass all the checks and yet segfault on running, as the generated shellcode is not proper.