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- Tutorial Number 29
-
- Written by Etenal Bliss
- Email: Eternal_Bliss@hotmail.com
- Website: http://crackmes.cjb.net
- http://surf.to/crackmes
- Date written: 21st Jul 1999
-
- Program Details:
- Name: Execution Crackme v0.1 by The Ghost[Execution 1999]
-
- Tools Used:
- SoftIce
-
- Cracking Method:
- Serial Sniffing
-
- Viewing Method:
- Use Notepad with Word Wrap switched on
- Screen Area set to 800 X 600 pixels (Optional)
-
- __________________________________________________________________________
-
-
- About this protection system
-
- This program requires a Code which is based on your name that is converted
- to Upper Case.
-
- _________________________________________________________________________
-
-
- About this tutorial
-
- This is a very short tutorial to show what serial fishing is like and
- how easy it can be in VB5. The aim of this tutorial is to show you that
- sometimes you need not trace into all the calls you see.
-
- _________________________________________________________________________
-
-
- SoftIce
-
- Run the CrackMe. Enter any Name/Code you want.
- Name: Eternal Bliss
- Code: 123456789
-
- Go into SoftIce and set the breakpoint __vbastrcomp
- This particular bp is very common in VB.
- __vbaStrComp means String Compare
- thus, it does what it is named after... Comparing String.
-
- Click on Register. You will break and will see something like below...
- It is quite a typical tracing. So, it is beneficial if you know this
- piece of code well...
-
- MSVBVM50!__vbaStrComp
- :797C3564 8BEC MOV EBP,ESP
- :797C3566 53 PUSH EBX
- :797C3567 56 PUSH ESI
- :797C3568 57 PUSH EDI
- :797C3569 837D1000 CMP DWORD PTR [EBP+10],00
- :797C356D BE00000000 MOV ESI,00000000
- :797C3572 7406 JZ 797C357A (NO JUMP)
- :797C3574 8B4510 MOV EAX,[EBP+10]
-
- After the mov eax, type "d eax" to see the contents of eax.
- You will see in the data window,
- :00421938 31 00 32 00 33 00 34 00-35 00 36 00 37 00 38 00 1.2.3.4.5.6.7.8.
- :00421948 39 00 00 00 49 00 53 00-53 00 00 00 B1 E6 0F A0 9...I.S.S.......
-
- The code I typed...hmmm
-
- Continue tracing,
- :797C3577 8B70FC MOV ESI,[EAX-04]
- :797C357A 837D0C00 CMP DWORD PTR [EBP+0C],00
- :797C357E BF00000000 MOV EDI,00000000
- :797C3583 7406 JZ 797C358B (NO JUMP)
- :797C3585 8B4D0C MOV ECX,[EBP+0C]
-
- After the mov ecx, type "d ecx" to see the contents of ecx.
- You will see in the data window,
- :00520FE4 33 00 30 00 31 00 36 00-30 00 00 00 00 00 00 00 3.0.1.6.0.......
- :00520FF4 00 00 00 00 DC 0F 52 00-00 00 00 A0 ?? ?? ?? ?? ......R.........
-
- hmmm 30160... Looks like serial?
- You must know now that VB strings are always converted to
- w.i.d.e. .c.h.a.r.a.c.t.e.r format.
-
- Now, replace 123456789 with 30160
- Name: Eternal Bliss
- Code: 123456789
-
- CrackMe Cracked!
-
- __________________________________________________________________________
-
-
- Additional Points
-
- Try making a KeyGen for this.
-
- __________________________________________________________________________
-
-
- Final Notes
-
- This tutorial is dedicated to all the newbies like me.
-
- My thanks and gratitude goes to:-
-
- All the writers of Cracks tutorials and CrackMes
- and also to all the crackers that have been supporting my site and project forum.