This time we are tackling this .net crackme. Let’s try it out first.

It’s a simple form requesting a username and a serial key.

On the main form code, we can see the validation method being called inside the confirmation button click method.

On the form creation method values are being set for each Label component, which are the labels showing the product ID. The only textbox element is the username.

So, given any username, this is the correct serial.

092246username21

Let’s test this out

Great! we cracked the binary!