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Message: <blockquote data-quote="firazrox" data-source="post: 10165422" data-attributes="member: 257817">Part 20. Introduction:In this part, the second part of the cracking tutorial, you will learn to use the most important tools of the common cracker: W32Dasm and HIEW. You will also learn to crack some simple programs.The tutorials are divided into 3 parts:Part 1:Introduction, tools and the basics of cracking. Part 2: Practical training, using W32Dasm, and HIEW. Part 3: key-generators1. Disclaimer:I created this tutorial for informational purposes only!Much of the information in this document can be used to perform illegal activities!Don't attempt to do anything stated in this document!If you do attempt to do anything, you are solely and fully responsible for what you do!If you get caught and get in any kind of trouble, it's your own fault!If you intend to use this information to impress your friends, leave it and grow up!If you don't agree to this, do not read any more!If you crack a program, and either sell the crack or offer it for free, it is a crime! <img src="/styles/default/xenforo/smilies/default/no.gif"  class="smilie" loading="lazy" alt=":no:" title="No    :no:" data-shortname=":no:" /><img src="/styles/default/xenforo/smilies/default/no.gif"  class="smilie" loading="lazy" alt=":no:" title="No    :no:" data-shortname=":no:" />2. The main steps of crackingYou have already seen these steps in the previous part of the tutorial, but it's very important to know them. Remembering these steps and following them is 40% of the way towards success in cracking the program!!!There are 7 steps in the cracking process:1.Run the program you want to crack and study it's behavior. try to locate strings and keywords, try to enter the password and see how the program responds.2.Open the program with the W32Dasm and disassemble it.3.Find typical and common Strings in the disassembly that appeared within the program.in most cases, you have to look for keywords such as: password, name, date, expired, Time limit, wrong, entered and so on.4.Find and observe the password generator, find the learn protection routine and the API calls.5.Try to understand the jumping mechanism of the protection.6.Open the program in Hiew. change the jump of the flow control to it's opposite jump command, or NOP it out.7.Run and check how the change you have made in the original program affected it.Feel the power you have, the power of of cracking, making programs behave the way you want them to.Learn those steps very well, until u dream of them, u will use them in every program you crack.3. Additional programs you need to have for this part of the tutorialBy now, in this part of the tutorial, you have learnt the main steps of cracking. Now, you are going to crack your first program.But before that, you need to get a little program called: "Sweet Little Piano" You can download it from: <a href="http://www.ronimusic.com/" target="_blank">http://www.ronimusic.com/</a>Now, when you have the program, let's start!4. Cracking the first program (Sweet little Piano)Now we will follow each step and crack the program:Step 1: Running the program:Well, Run it! Duh... <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":-)" title="Smile    :-)" loading="lazy" data-shortname=":-)" />Well, what do we see here..... The program opens two text files. Also we see "Unregistered Shareware" on the caption bar...Now let's open the Help menu for any registration options... Humm, what do we see here now...oh, it's a password option... Well, select it and enter something (don't hope it will be right <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":-)" title="Smile    :-)" loading="lazy" data-shortname=":-)" />). To see what happens... ClickOK.. Hmm, nothing happens.... Maybe it accepted it? Hmm.. no way... the caption bar still says Unregistered... Ok close it...bah ... more text files ... and a notification that the settings are not saved in the unregistered version ... well ... kind ofirritating those text files! Let's fix it <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":-)" title="Smile    :-)" loading="lazy" data-shortname=":-)" />Step 2: Disassemble the program:Disassemble the program. Good, small is fast <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":-)" title="Smile    :-)" loading="lazy" data-shortname=":-)" /> Always.... Now, we don't have any strings that pop up when we want toregister something... Let's browse for strings like registered, unregistered, the string about the unsaved settings. Hmm...evaluation time left ... password.txt.... passworddialog.... sweet little piano - Unregistered <<-- looks like our caption bar <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";-)" title="Wink    ;-)" loading="lazy" data-shortname=";-)" />go on...Thanks for registering ... cool! So it thanks you anyway <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":-)" title="Smile    :-)" loading="lazy" data-shortname=":-)" /> Let's jump to that place ... Double click on it an we will popright on top of the registration routine...Step 3: Analyzing the protection routine.... / Understanding the jumping Mechanism...Let's analyze the protection routine.<img src="http://i52.tinypic.com/2zs1gl4.png" alt="" class="fr-fic fr-dii fr-draggable " style="" />PasswordDialog ... a call to GetDlgItemTextA ... another call.... a test... and depending on the test a je.... The je jumps over the thank you ... And just ends the dialog box ... without telling you that you entered something wrong... So this is right ... we did indeed not see that we typed something wrong ... but apparently we are supposed to see if we type something right <img src="/styles/default/xenforo/smilies/default/happy.gif"  class="smilie" loading="lazy" alt=":)" title="Happy    :)" data-shortname=":)" />Again execute the je jump, and look where it goes to ... return from the jump.... Now lets try to rewrite what goes on here...call ShowPasswordDialogcall GetEnteredTextcall IsEnteredTextGoodtest value in eaxje QuietExitShowThanksForRegisteringQuietExit:the source code must have looked like this :GetDlgItemText(_ID_Serial);if (EnteredTextGood) ShowThanksForRegistering// else nothing....This is another interesting piece of code.... test eax, eax ... this assembler instruction tests if the value of eax is equal toitself ... if it is it is equal ... so a je instruction jumps ... if it is not equal, it does not jump.... To crack this program we can change the je instruction into two nop instructions... and we are done...We have seen here, that the call has put a value in eax.... something which is not equal to zero or a zero... In our previousexample we saw that the called Is_Serial_Valid call set some value in memory ... Here we see that the calledIs_Serial_Valid call sets the eax register of our processor to some value....Step 4: Changing the original program...So modify it <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":-)" title="Smile    :-)" loading="lazy" data-shortname=":-)" />1. Open Hiew. 2.Open the file within Hiew.3.Find the Adress of the line in W32Dasm (it's on the status bar beginning with '@').4.Press F5 in Hiew.5.Enter the address you have found in (4) and press ENTER.6.Press F3 - for activating the write option.7.Press F2 - to change the instruction.8.Replace the command by 'NOP' (without quotes), which means NO OPERATION.9.Now a new command appeared in the next line.10.Replace it by NOP too.11.If another new instruction hasn't appeared, Press F9 to update the file.12.Press F10 to exit.13.Run the program and see the result.මෙතන හරියට කරගන්න බැරි උනොත් පොස්ට් කරන්න කෙල උන තැන... <img src="/styles/default/xenforo/smilies/default/yes.gif"  class="smilie" loading="lazy" alt=":yes:" title="Yes    :yes:" data-shortname=":yes:" /><img src="/styles/default/xenforo/smilies/default/yes.gif"  class="smilie" loading="lazy" alt=":yes:" title="Yes    :yes:" data-shortname=":yes:" /> ill help u <img src="/styles/default/xenforo/smilies/default/happy.gif"  class="smilie" loading="lazy" alt=":)" title="Happy    :)" data-shortname=":)" /><img src="/styles/default/xenforo/smilies/default/happy.gif"  class="smilie" loading="lazy" alt=":)" title="Happy    :)" data-shortname=":)" />5. Conclusionමම මෙ දුන්නෙ ගොඩක් අමාරු සොෆ්ට්වෙර් එකක් උදා විදිහට ක්‍රැක් කරන්න..... මෙක හරියට කලොත් අ කියන්නෙ... අනිත් සොෆ්ට්වෙර් උත් පුලුවන් අනිත් එව මෙ වගෙ නෙවේ ගොඩක් ලෙසී...ප්‍රයෝජනවත් උනානම් රෙප්++ දෙන්නඊලග පොස්ට් එකෙ මම හැක් කරන හැටි කියල දෙන්නම්....එවත් දැන ගන්න ඔනෙනම් කමෙන්ට් ඇන්ඩ් රෙප්ස් දෙන්න....-firazrox <img src="/styles/default/xenforo/smilies/default/yes.gif"  class="smilie" loading="lazy" alt=":yes:" title="Yes    :yes:" data-shortname=":yes:" /><img src="/styles/default/xenforo/smilies/default/yes.gif"  class="smilie" loading="lazy" alt=":yes:" title="Yes    :yes:" data-shortname=":yes:" /></blockquote>

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