Cracking Tutorial for Abracadabra 1.2.3
 
 


Target Program: Abracadabra 1.2.3
Description: Abracadabra is a multipurpose utility for view and edit text and graphic files.
Location: http://www.geocities.com/SiliconValley/Horizon/1002
Protection: Name / Reg #
Tools needed: - SoftICE 3.24
Ob duh: Do I really have to remind you all that by BUYING and NOT stealing the software you use will ensure that these software houses will continue to produce even *better* software for us to use and more importantly, to continue offering even more challenges to breaking their often weak protection systems.
BTW, It's illegal to use cracked Software!

 
If you're looking for cracks or serial numbers from these pages then your wasting your time, try to search elsewhere on the Web under Warez, Cracks, etc.
Info: Brand and product names are trademarks or registered trademarks of their respective holders.
Level: (X)Beginner (X)Intermediate ( )Advanced ( )Expert

In my 19th and 20th tutorial I tried to teach you how to crack Visual Basic programs by using SmartCheck and SoftICE - now I'll teach you how to make a keygen. This keygen is really simple and you will understand the code COMPLETLY (hope I've commented it good enough). Now to the keygen: The most important thing if you want to produce a keygen is to understand the code COMPLETLY. I took a really easy example program so that you can 'get it'. Maybe if I write a keygen tutorial again (if you're interested, drop me a mail) I'll choose a not so easy program. Now let's start our Cracking Session.
 
First we need to enter the basic stuff in the input fields. I used "Keygen Tutorial" as Name and "12345" as Registration Code. Then I enterd SoftICE and set a BPX to HMEMCPY, left SoftICE and pressed the "OK"-Button. SoftICE poped up. Since there were 2 input fields we can skip the first one - SoftICE will pop up again. So as SoftICE pops up again, delete that HMEMCPY breakpoint and press F12 until you're back in the "ABRA"-Code. Now just trace a little bit through the code till you reach the following code snippet:

 
  :004647E3    CALL    00403BB4
  :004647E8    TEST    EAX,EAX
  :004647EA    JLE     004647FF
  :004647EC    MOV     EDX,00000001                 ; start with 1st char
  :004647F1    MOV     ECX,[EBP-08]
  :004647F4    MOVZX   ECX,BYTE PTR [EDX+ECX-01]    ; mov 'code' of xth char in ECX
  :004647F9    ADD     ESI,ECX                      ; add it to sum
  :004647FB    INC     EDX                          ; prepare next char
  :004647FC    DEC     EAX                          ; decrease number of chars 'left'
  :004647FD    JNZ     004648F1                     ; last char not reached?

The above code is self explained I think. But if not: it just adds the value of each character together. So for "Keygen Tutorial" this in hex 4B+65+79+67+65+6E+20+54+75+74+6F+72+69+61+6C, which is 5D7 h. Since we know this we can go on with the tracing:

  :0046480A    IMUL    EAX,EAX,000003E7              ; SUM * 3E7
  :00464810    MOV     ESI,EAX
  :00464812    CMP     ESI,[EBP-04]                  ; compare
  :00464815    JNZ     00464916                      ; JMP if bad cracker
  :0046481B    MOV     DL,01                         ; 'good code flag'

I hope you understand what I mean with my comments. So Abracadabra generates it's right serial # by doing the following:
1) adding all values of the chars together (no chars are ignored)
2) it multiplies them with 3E7 h
 
Now code your keygen in your favourite programming language - like C++. BTW, you're registration details are stored at "HKEY_CURRENT_USER/Software/Akatoma/Abracadabra".

 
 

// This is the C++ Source Code of my KeyGEN. I hope you like it.
// I've compiled it using Symantec C/C++ 6.11

#include <stdio.h>

int main()
{
unsigned long regcode, i;
char name[1000] = {0};

printf("   ____                     __       __\n");
printf("  /  _/_ _  __ _  ___  ____/ /____ _/ /\n");
printf(" _/ //  ' \\/  ' \\/ _ \\/ __/ __/ _ `/ /\n");
printf("/___/_/_/_/_/_/_/\\___/_/  \\__/\\_,_/_/\n");
printf("   ____                          __          __\n");
printf("  / __ \\___ ___ _______ ___  ___/ /__ ____  / /____\n");
printf(" / /_/ / -_|_-</ __/ -_) _ \\/ _  / _ `/ _ \\/ __(_-<\n");
printf("/_____/\\__/___/\\__/\\__/_//_/\\_,_/\\_,_/_//_/\\__/___/\n\n");

for (;;){
printf("\nAbracadabra 1.2.3 KeyGEN - d0NE bY TORN@DO in '99\n");
printf("=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=\n");
printf("Name:               ");
gets(name);

if (strlen(name)<1) return 0;
else break;
}

regcode=0;

// add values together
for (i=1; i<=(strlen(name)); i++) regcode=regcode + name[i-1];

// multiply regcode with 3E7
regcode = regcode * 0x3E7;

printf("Registration Code: %lu\n", regcode);
return 0;
}

 
 
Another target has been Reverse Engineerd. Any questions (no crack requests)?

 

 
If you're USING Abracadabra BEYOND it's FREE TRIAL PERIOD, then please BUY IT.


Copyright 1999 by TORN@DO and The Immortal Descendants. All Rights Reserved.


BACK


ook at how