Reversing Simple DNS 5.2.117

[NewEraCracker]

This tutorial is just for educational purposes.

Simple DNS has two files with protection. sdnsgui.exe and sdnsmain.exe, both are obfusacated with dotfuscator.

sdnsgui.exe

Open it with an hexeditor

Killing selfcheck
Offset: 0x1ffc2
Find: 3A C4
Replace: 26 2A

Killing callbacks
Look for the unicode string: activate.ashx?auto=
It should be trivial to take care of this.

sdnsmain.exe
This file was obfuscated to make harder to edit it with Simple Assembly Explorer, so we need to de-obfuscate it first with dotfuckscator

After file is deobfuscated proceed:
Licensing functions are handled by "aj" class, feel free to explore it

Now open .cctor(): void
Change "ldc.i4.0" to "ldc.i4.1"
This will give you infinite zones

Open a(): void and scroll down:
Right after "System.Security.Cryptography.RSACryptoServiceProvider" code
L_0194: Change "brfalse.s" to "brtrue.s"
This will fix bugs caused by serial removal.

Open a(String, String): Boolean
Click in L_0000 and insert after opcode "ret"
This will kill serial checks.

Open c(): void
See the br at L_0009, change it to jump to line 510 using edit.
Finally at L_06e8, change ldc.i4.0 to ldc.i4.1
This will disable reading license file and return true.

No nags, no serial, infinite zones.

Useful links (as I can't attach files here due copyrights):

PHP Code:

SAE and Reflector: http://www.mediafire.com/?hhuu7meyzmoscp8
Simple DNS v5.2.117: http://www.multiupload.com/4XW9THQK5K