We pop inside GetDlgItemTextA, Lets find the registration routine…
I`ll save you the work, the registration routine is this:
:00404DB2 8D95A8FAFFFF lea edx, dword ptr [ebp+FFFFFAA8]
:00404DB8 52 push edx —> Your user name here.
:00404DB9 E80B550000 call 0040A2C9 —> Registration routine.
:00404DBE 83C408 add esp, 00000008 —> Dunno exactly what is it.
:00404DC1 85C0 test eax, eax —> Boolean identifier, 0 if
:00404DC3 7D17 jge 00404DDC —> registration failed, 1 if
OK.
Well, Let’s enter the CALL 40A2C9, and see what’s inside it:
(Please read my comments in the code).
* Referenced by a CALL at Addresses:
|:00404DB9 , :00407F76
|
:0040A2C9 55 push ebp
:0040A2CA 8BEC mov ebp, esp
:0040A2CC 81C4B0FEFFFF add esp, FFFFFEB0
:0040A2D2 53 push ebx
:0040A2D3 56 push esi
:0040A2D4 57 push edi
:0040A2D5 8B5508 mov edx, dword ptr [ebp+08]
:0040A2D8 8DB500FFFFFF lea esi, dword ptr [ebp+FFFFFF00]
:0040A2DE 33C0 xor eax, eax
:0040A2E0 EB16 jmp 0040A2F8
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:0040A2FB(C)
|
:0040A2E2 0FBE0A movsx ecx, byte ptr [edx] —-> Here Starts the interesting part.

:0040A2E5 83F920 cmp ecx, 00000020 —-> ECX is the the current
char in the user name, Hmm, 20h=’ ‘…
:0040A2E8 740D je 0040A2F7 —-> Let’s see,
:0040A2EA 8A0A mov cl, byte ptr [edx] —-> Generally, all this loop does, is copying
the user name from
[EDX], to [ESI], WITHOUT the spaces!
(Keep this in mind! ).
:0040A2EC 880C06 mov byte ptr [esi+eax], cl
:0040A2EF 42 inc edx
:0040A2F0 40 inc eax
:0040A2F1 C6040600 mov byte ptr [esi+eax], 00
:0040A2F5 EB01 jmp 0040A2F8
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:0040A2E8(C)
|
:0040A2F7 42 inc edx
* Referenced by a (U)nconditional or (C)onditional Jump at Addresses:
|:0040A2E0(U), :0040A2F5(U)
|
:0040A2F8 803A00 cmp byte ptr [edx], 00
:0040A2FB 75E5 jne 0040A2E2 —————-> This is the loop , we got
what it does,
Let’s continue tracing
the code…

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