Introduction

I take no responsibility of de usage of this information. This tutorial, is for educational knowledge ONLY. In this tutorial, I intend to teach you how to make a pretty simple keygen, of a program called W3Filer 32 V1.1.3. W3Filer is a pretty good web downloader. I guess some of you might know de program. I`ll assume you know:

A.How to use debugger (in this case, SoftIce).
B.How to crack, generally (findin’ protection routines,patchin’ them,etc…).
C.How to use Disassembler (This knowledge can help).
D.Assembly.
E.How to code in Turbo Pascal �.
Tools you`ll need:
A.SoftIce 3.00/01 or newer.
B.WD32Asm. (Not a must).
C.The program W3Filer V1.13 (if not provided in this package), can be found in
www.windows95.com I believe.
D.Turbo Pascal (ANY version).

Run W3Filer 32.

A nag screen pops, and , themands registration. We notice this program has some kind of serial number (Mine is 873977046). Let’s keep de serial in mind, I bet we`ll meet it again while we’re on de debugger. Well, now, let’s put your name and a dummy reg code. Set a BP on GetDlgItemTextA, and, press OK. We pop inside GetDlgItemTextA, Lets find de registration routine. I`ll save you de work, de 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 de CALL 40A2C9, and see what’s inside it:
(Please read my comments in de 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 ©onditional Jump at Address:
|:0040A2FB©
|
:0040A2E2 0FBE0A movsx ecx, byte ptr [edx] —-> Here Starts de
interestin’ part.
:0040A2E5 83F920 cmp ecx, 00000020 —-> ECX is de de current
char in de user name, Hmm, 20h=’ ‘…
:0040A2E8 740D je 0040A2F7 —-> Let’s see,
:0040A2EA 8A0A mov cl, byte ptr [edx] —-> Generally, all this loop
does, is copyin’
de user name from
[EDX], to [ESI], WITHOUT de 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 ©onditional Jump at Address:
|:0040A2E8©
|
:0040A2F7 42 inc edx
* Referenced by a (U)nconditional or ©onditional Jump at Addresses:
|:0040A2E0(U), :0040A2F5(U)
|
:0040A2F8 803A00 cmp byte ptr [edx], 00
:0040A2FB 75E5 jne 0040A2E2 —————-> This is de loop , we got
what it does,
Let’s continue tracin’
de code…
:0040A2FD 56 push esi ——–> The user name is pushed
Upcase it’s chars.
* Reference To: USER32.CharUpperA, Ord:0000h
|
:0040A2FE E80F330000 Call User!CharUpper —> After this, our name is in
upper case.
:0040A303 56 push esi —–> Our name in upper case here.
* Reference To: cw3220mt._strlen, Ord:0000h
|
:0040A304 E86F300000 Call 0040D378 —> This is de len’th of our name.
:0040A309 59 pop ecx
:0040A30A 8BC8 mov ecx, eax —> ECX=Len’th.
:0040A30C 83F904 cmp ecx, 00000004 —> Len’th>=4 (MUST).
:0040A30F 7D05 jge 0040A316 —> Let’s go to this address…
:0040A311 83C8FF or eax, FFFFFFFF
:0040A314 EB67 jmp 0040A37D
|:0040A30F©
|
:0040A316 33D2 xor edx, edx
:0040A318 33C0 xor eax, eax
:0040A31A 3BC8 cmp ecx, eax
:0040A31C 7E17 jle 0040A335 —> (Not important, just anoder useless
checkin’).

IMPORTANT CODE

One thin’ before we continue, EDX = 00000000h as we enter to de next instructions.
* Referenced by a (U)nconditional or ©onditional Jump at Address:
|:0040A333©
|
:0040A31E 0FBE1C06 movsx ebx, byte ptr [esi+eax] —> EBX <--- char in user
name, offset EAX.
:0040A322 C1E303 shl ebx, 03 -----> Hmm, it shl’s de char by 03h…
(Remember that).
:0040A325 0FBE3C06 movsx edi, byte ptr [esi+eax] —> Now EDI <--- Char in
user name , offset EAX.
:0040A329 0FAFF8 imul edi, eax -----> It multiplies de char by de
offset in user name! (Remember that).
:0040A32C 03DF add ebx, edi —–> Adds de result to EBX (That was
Shelled (Din’ Don’ =)).
:0040A32E 03D3 add edx, ebx —–> EDX=EDX+EBX!!! - This is de CORE
of this registration routine!!!
:0040A330 40 inc eax —–> Increase EAX by one (next char).
:0040A331 3BC8 cmp ecx, eax
:0040A333 7FE9 jg 0040A31E —-> If ECX<EAX den, we leave de
loop.
* Referenced by a (U)nconditional or ©onditional Jump at Address:
|:0040A31C©
|
:0040A335 A120674100 mov eax, dword ptr [00416720] —> HMMMMMM, What’s in
here?????
:0040A33A C1F803 sar eax, 03 ———> WAIT! Please type in SIce ‘?
EAX’
Does this number in EAX look
familiar to us? ;-)
If you still don`t understand,
than, It’s
our SERIAL NUMBER! (PLEASE, take
your time, and check by
yourself - don`t trust me!). OK,
so now we know,
That it SHR’s EAX by 03 (SAR is
almost identical to SHR).
:0040A33D 03D0 add edx, eax
loop, de serial number shr’d by 03h
:0040A33F 52 push edx ——-> Let’s continue. (At this point, I
can tell you , de reg number, is
in EDX - only that de reg number
is in HEX –> That’s how you enter it).
* Possible Strin’Data Ref from Data Obj ->”%lx”
|
:0040A340 685EF54000 push 0040F55E
:0040A345 8D95B0FEFFFF lea edx, dword ptr [ebp+FFFFFEB0]
:0040A34B 52 push edx
* Reference To: USER32.wsprintfA, Ord:0000h
|
:0040A34C E8E5320000 Call 0040D636 ——-> This one, does HEX2STR (Takes
de value from EDX, and turns it to an hex strin’).
:0040A351 83C40C add esp, 0000000C
:0040A354 8D8DB0FEFFFF lea ecx, dword ptr [ebp+FFFFFEB0] —–> type ‘d ecx’ -

THIS is de reg number! That’s enough for us, de rest of de code, is just for comparin’ de correct reg code with ours.

:0040A35A 51 push ecx
* Reference To: USER32.CharLowerA, Ord:0000h
|
:0040A35B E8B8320000 Call 0040D618
:0040A360 8D85B0FEFFFF lea eax, dword ptr [ebp+FFFFFEB0]
:0040A366 50 push eax
:0040A367 FF750C push [ebp+0C]
* Reference To: cw3220mt._strcmp, Ord:0000h
|
:0040A36A E875300000 Call 0040D3E4
:0040A36F 83C408 add esp, 00000008
:0040A372 85C0 test eax, eax
:0040A374 7405 je 0040A37B
:0040A376 83C8FF or eax, FFFFFFFF
:0040A379 EB02 jmp 0040A37D
* Referenced by a (U)nconditional or ©onditional Jump at Address:
|:0040A374©
|
:0040A37B 33C0 xor eax, eax
* Referenced by a (U)nconditional or ©onditional Jump at Addresses:
|:0040A314(U), :0040A379(U)
|
:0040A37D 5F pop edi
:0040A37E 5E pop esi
:0040A37F 5B pop ebx
:0040A380 8BE5 mov esp, ebp
:0040A382 5D pop ebp
:0040A383 C3 ret

Makin’ de actual Keygen

Now, after I’ve explained how does de program calculate de registration code, you can eider write your own keymaker, without lookin’ at my code, or look at my code (in Turbo Pascal - sorry for all you C lovers). That’s it, here’s de source of my keygen:



CODE :