Retrouver Serial Avec Ollydbg Tutorial Beginners
Tutorial #2: Trouver un serial valide pour le CrackMe * Appr. WinDasm et OllyDbg) - Retrouver le serial d'un soft. On test avec une longueur de cl. Plecost est un script Python permettant de retrouver la version install Retrouver le serial d'un soft. Jun 02, 2013. Trouver le mot de passe d'un crackme avec ollydbg by Gadour. HOW TO HACK any game OLLYDBG TUTORIAL. Reverse Engineering - Obtaining a serial. Retrouver Serial Avec Ollydbg Tutorial Malware Retrouver Serial Avec Ollydbg Tutorial For Beginners. 17 Retrouver Et Sauvegarder Ses Cl. Comment Trouver Le Cl.
Nicely, I initially did a movie on this last night, but on my internet, uploading wasn'capital t going to occur. So, since three (four?) individuals asked for that I publish something like this; I'll provide it a chance. This can be a easy intro to the plan OllyDBG. (Furthermore known as Olly Debugger, and, as I including to contact it; Olly). Edit: Included three more 'Crack Me' programs for you guys to mess with/find out with.
Examine attachments for extracrackmes.rar Edit 2: Added a fast movie on resolving 'Break Me's 3, 4, and 5. Check the bottom level of the article. First of all, a issue many individuals ask is certainly: What can be Olly? The reply is basic, actually. Olly is certainly an times86, 32bit debugger initially designed for programmers who got problematic mistakes in their programs. It permitted them to go through their application step-by-step, monitoring many every actions that the software had taken.
And by doing so, this allowed them to find where the error actually occurred in real-time, and produced it very much much easier for them to repair it. Right now you may be thinking, what will Olly have to do with you, after that? Properly, it has very a great deal to perform with you, in fact. Apart from the essentials of the debugger, it will be more widely utilized for the purposes of slow anatomist.
The act of getting capable to walk through a program step-by-step can make it tremendously less difficult to discover things that normally you couldn't (or instead, experienced a really hard time getting.) And at the exact same period, it enables us to go to issues like conditional claims, and either change the problem, or alter the whole statement, all in current without even having to recompile or restart the application. So, 1st things first, allow's take a appearance at the interface, keeping in thoughts that I was making use of OllyDBG v2.01 Alpha dog 4.
At the top portion of Olly, we have got a long line of horizontal control keys that will save us having to actually make use of the selections for the majority of the time. Let's move ahead and get a 2nd to provide a short description as to what each of these control keys does. This is the Open switch. As you've possibly already guessed, it opens a document into Olly. This is certainly the Restart button. Fairly apparent, it restarts our executable.
This is definitely the Close switch. It shuts down the executable we're also working with therefore we can load a brand-new one. This can be the Run button.
It starts our executable, so we can begin going through/analyzing it. This is certainly the Work Thread switch. It does the same as over, but only operates the present line. This will be the Stop key.
It breaks out executable so we can look around or do other factors. This can be the Stage Into key. It actions lower into the following series, or enters the current function. This is usually the Phase Over switch. It will the same as over, but executes the functionality all at as soon as, rather of heading into it and walking through each activity. This is the Search for Into key. Same premise as the Stage Into key, but works with our run search for.
This will be the Trace Over button. Same principle as the Action Over key, but functions with our work search for.
This is the Execute Until Return button. It will maintain moving into the application until it strikes a return, either from a function, or the application itself. This can be the Execute Until User Code switch.
It will keep walking into the program until it strikes code that is usually not component of the program features. (The right after are home windows.) 13. Caddy electrical 3 82 keygen download. This can be the Logger home window. Quite self-explanatory.
This is certainly the Executable Modules home window. This is usually very helpful for switching to which portion of the application and/or its extensions/your local library you want to look through. This will be the Memory space Map window.
We can make use of this to find something particular in the memory space space of the application. This is certainly a good method to discover the un-packed data inside a loaded program. This is certainly the Screen Listing.
It usually displays us a list of screen handles owned by our software. Also quite helpful.
This will be the Strings windows. This enables us to see and select which thread we want to function with, amongst some other things. This is the CPU window. This will be where the primary of the software is proven: the code. This is definitely usually shown in Set up program code, and this is where we will do many of our function. In this screen we can do anything from monitor the actions the software takes, to modifying what the software will do following in real-time. This will be the Search Results windows.
Quite self-explanatory. This is usually the Run Trace screen.
This will end up being more useful later on, and is certainly very helpful for looking up transformed in particular factors. This is the Breakpoints windows. This provides us a listing of the breakpoints we currently have arranged, so we can simply double click after that to jump directly to that place in the memory. This is certainly the Memory space Breakpoints windowpane. Pretty self-explanatory. This will be the Equipment Breakpoints screen. Quite self-explanatory.
This is the Options screen. We can alter plenty of points associated to Olly in here, including colors. That's i9000 it for our basic run-down of the control keys, and those will most likely be the only buttons you need for today. So, let's consider a look at really making use of Olly. With this line, I have included two quite basic “Crack Me” programs, which were coded in M (Therefore they're extremely easy to step through.) What I will do now is stroll you through how to resolve each of the three applications.
So, let's begin with the very first one. Given you downloaded the archive and unpacked it currently, go forward and open up crackme01.exe in Olly. You should obtain something like this once it can be done loading: (Ignoring the truth my colours are different.) Discover that in the bottom part right corner, our position indicator says that the program can be Paused?
That'h the default for when you open an software in Olly. It will not really run instantly, but rather temporary stop and wait for insight.
That't okay many of the period, since we don't continually require to run it however. However, let's consider a photo at it first.
Go ahead and click on your Run key to operate the application, and as soon as it is definitely done loading, the program's home window should appear like this: As with many “Break Me” programs, it will be requesting a security password. Let's move ahead and type a arbitrary password, examining should function for right now. Appears like that wasn'capital t the security password, right? Therefore now you're most likely asking yourself how we proceed about getting the correct security password. That's one of the simplest factors to do with Olly, therefore let's move forward and consider.
First issues first, make use of the Restart switch to restart the software. As soon as it is done launching again, look at your CPU windowpane. One of the very first stuff we always would like to perform to create sure points are accurate, is make certain that the program code has happen to be re-analyzed. To do therefore, we best click our CPU windowpane (inner top-left pane) and go to Analysis >Analyze code (or you can push CTRL + A new.) Once you've carried out that, best click again, but this period proceed to Research for >All referenced guitar strings.
(In old variations, it should end up being All referenced text message strings.) You should obtain a screen that appears like this: Today, we can disregard those strings up top, because those are just part of the internals. (I compiled the “Crack Me” applications in a CygWin environment.) But look at the guitar strings on the bottom level, aren't those the exact same as what will be proven in the system window?
Right, that indicates that these are usually the strings saved inside the application. Take note that a chain does not really possess to end up being saved in a adjustable for it to show up here, so also if you acquired something like. Code: if (myUsername “TheRealDeal”) The chain TheRealDeal would nevertheless show up in this windowpane, because these are usually referenced strings, meaning any explicit line that is definitely used inside our software (they're also stored in the memory.) Anyhow, allow's take a appearance at this list.
Doesn't something stick out to you? There's one range that is not result to the gaming console, and it's all by itself. That range is ASCII “elitepvpers”.
The fact that it's i9000 by yourself by itself indicates that it is either kept in its personal adjustable, or can be accessed in a evaluation or the likes. So, if we're also considering the method we should be, we should know that that is definitely a likely candidate for the security password! Allow's go ahead and try out and make use of elitepvpers as the security password. Wow, looks like we resolved it!
That wasn'capital t so hard, has been it? It'beds not often that things are that easy, but it's not really totally out of the formula either. Even more frequently than not, the details that we require to continue is right in front of our encounters. So, let's consider a appearance at another technique of bypassing simple assessments.
Allow's proceed ahead and Close up this one and insert up the second “Split Me”, by launching crackme02.exe into Olly. Once we've packed it up, allow's proceed forward and Run it. It appears like this a single is going to be slightly more difficult. Not only does it state it has two checks, but it furthermore claims that it will not really function the same way. By getting a look at the system, we find that this period it is asking us for a username and not really a security password.
Now, if you're planning like you should end up being, you should believe that this indicates provided the truth there are apparently two checks, it desires a username and security password. Allow's go forward and consider a random username. Wow, that didn'testosterone levels go really far, do it.
So we understand that if there really are usually two checks, it checks the username before actually acquiring us to the password, which is usually slightly more tough. But not really only that, there has been point out that it did not work in the same way as the very first one. Therefore, allow's go forward and reboot the software, and as soon as it can be done, create sure we analyze the code with CTRL + A new, and move to Search for >All referenced guitar strings. As the home window comes upward, we possess a little even more data than last time. Today the initial things you should find are Administrator and HardToGuessPassword. These really nicely could become the username and password, but above them we find “ You're looking in the incorrect place.” Seems like that's i9000 a suggestion remaining for us, doesn't it.
In any situation, let's move ahead and test the username and password anyway. Certainly it wasn't a bluff. Therefore, what do we do now? Properly, first allow's restart the software.
Now, allow's proceed ahead and find out a 2nd technique for skipping factors like this. Go ahead and move back again to Research for >All referenced guitar strings.
Discover that 1st of all, there are two “Sorry, you been unsuccessful.” strings, but just one “Best wishes, you passed!” line. This verifies that: there are two inspections, and; you can just pass if you get both best. So, proceed ahead and twice click on the very first “Sorry, you hit a brick wall.” string. This will consider us to the address that it can be referenced. Nicely now, appear at that. Right above our failure information we possess a jump.
What a jump does will be it jumps to a particular tackle in the memory space, going best over and disregarding any program code in-between the two factors. In this case it's a JE SHORT. Very first, we appear at the JE, what does that lead to?
Essentially, it explicates to Jump if Equivalent. (The reverse being JNE: Jump if Not really Equal) So, if the condition in the range before (over) the leap is fulfilled, we will consider the jump to the address of 0x0040135C, and if not, we will proceed to the line after (below) the leap. The SHORT simply indicates that the leap deal with (focus on) is certainly within the range of -128 to 127, meaning that it's either within 128 address backwards (up), or 127 handles ahead (down). So, allow's get a appearance at the condition above the leap: TEST BL,BL.
That's i9000 generally another method of stating CMP BL,0 (or in some other words, Compare BL with 0, or if (BL 0)). Let's go ahead and click the collection TEST BL,BL and strike the Y2 key to fixed a breakpoint at that deal with. Doing therefore will trigger the application to temporary stop and inform us when it will get to that stage. So, once our breakpoint is certainly set, allow's operate our program and get into a random username. We should today become at this point after entering the username. Observe in the small package in the center (vertically) we notice BL=01, which shows us that BL equals 1.
Understanding that Check BL,BL generally checks to notice if BL means 0, we understand that the jump will not really be used. This indicates that rather, we will proceed over it, and land on the message “Sorry, you failed.” So, what can we perform? We can really do many points: NOP the test line; change it to something like CMP BL,1; change the deal with of the jump to the deal with of the success information or the security password check; or we can just alter the worth of BL. Let's proceed with that method, and move over to the top-right package. We notice the register checklist, which appears like this. Right now we only require to pay attention to our main registers: EAX, EBX, ECX, EDX. EAX includes the registers AL (A Lower), AH (A higher), and AX (A Lower A new Increased).
AL and AH are both 4 little bit signs up ( two bytes.) AX, the mixture of AH and AL can be an 8bit register ( four bytes.) The same applies to EBX,ECX, and EDX, but it's C, M, or M rather of A new. Therefore with this in brain, allow's proceed forward and double click on the EBX sign up (double click on the numbers, in this situation: 00000001). We should now observe this. We know that we desire to change the value of BL, therefore allow's go forward and modify the 01 to 00.
This will utilize the adjustments to the additional boxes, so don't get worried about them. Right now, go ahead and click on Fine, and then Operate the program. We should understand be caused for the password. Go ahead and get into anything. Properly, would you appear at that, we handed! Wasn't that tough either, has been it? This is usually yet another illustration of simply how useful Olly can become, and however these are simply the basics of what it can really do.
I hope that you've discovered something from this, and I wish that you today feel even more self-confident in learning to make use of Olly. You should sense comfortable inviting Olly into your reservoir of tools, as right now you understand simply how useful it actually is definitely. I hope that you keep on to find out to use it much better, as it actually will advantage you down the street. Edit: Here's a fast movie walkthrough for solving 'Split Me personally' applications 3, 4, and 5. (I obtained an e-mail wondering if they had been solvable at all, when they're soft easy.) Make sure to view it in HD and FULLSCREEN.
Area 2 - Getting Began - Okay, so you should have downloaded the crackme and have got Ollydebug set up. First factor to do is close this tutorial and have got a have fun with around. Find what you can find and obtain a experience for the system.
The very minimum this will do is coach you how to make use of simple Ollydebug functions. No cheating today;-) Done? Well maybe you suprised yourself and discovered things you believed you'd in no way find? Maybe you discovered nothing at all and reckon you just squandered 30 a few minutes? Either way, I'll proceed through the process I used to reverse this and ideally it will teach you a few things. Okay, therefore run the crackme and let us possess a look around.
Properly, theres not much to discover but we can find a 'Sign up' package. Enter a consumer name into the container and a random username. You'll get a information stating 'No luck there mate' (incidentally, if you do take place to guess your serial and get the 'Well done' message, I suggest that you purchase a lottery ticket today). So we know what we need to do; we need to discover the serial - at this point we dont know if its a hard coded number or if its generated from the usérname but thats component of the enjoyment! Okay, therefore open up Olly and select Crackme1.exe.
You'll after that be offered with the operation of the application, beginning about right here: 00401000 6A 00 PUSH 0 00401002 Y8 FF040000 CALL 00401007 A3 CA204000 MOV DWORD PTR DS:4020CA,EAX 0040100C 6A 00 Press 0 Today, we understand that the Crackme can be acquiring whatever we entered and checking it against the appropriate serial. Sonic the hedgehog 06 xbox 360 iso. We as a result need Olly to intercept any phone calls this crackme can make where it could end up being reading through what we entered from the usérname and serial containers. There are usually a several ways windows does this - its beyond the scope of this post to train you the depths - but I will inform you that oné of thém if making use of the contact 'GetDlgItemTextA'. Therefore, what we require to perform is make sure that if the Crackme makes this call, Olly intercepts it and fractures for us so that we can adhere to what is definitely being completed with the details.
Thats easy good enough. If you push Ctrl-N (or correct click and select 'Research for' implemented by 'name (content label) in current module') you are usually presented with a listing of calls produced by the crackmé.
You can then right click on GetDlgItemTextA and choose 'collection breakpoint on every referrals'. We're also ready to go. Press F9 and Olly will operate the crackme, delivering you with its consumer interface. Proceed to the registration container and get into a title and any serial. I'meters using 'FaTaLPrIdE' and '123456'. Push the sign up switch and Olly should split here: 004012C4. Age8 07020000 Contact 004012C9.
83F8 01 CMP EAX,1 004012CChemical. C745 10 EB0300>MOV DWORD PTR SS:EBP+10,3EB Right now, this can be the initial referrals to the call 'GetDlgItemTextA' so we understand our serial is usually shortly going to end up being learn in.
If you read through the best of you Olly window, it should say Processor - major thread, component Crackme1. This is usually important as when this states Kernel or Consumer32, we know we can keeping stepping as it provides nothing to do with our serial - we are only fascinated in the Crackme. Press F8 to stage over the plan and try out to obtain a experience for what is certainly heading on. Pressing just twice will provide you into User32 and after 15 phase overs we are back with the crackme. 25 tips consider us back to User32 and 38 consider us back again. In potential you will make use of N10 and F12 to phase, N8 just displays you more of whats involved.
If we continue this process we go through a lengthy program in User32 and eventually land back again right here: 00401223. 83F8 00 CMP EAX,0 00401226.^74 BE JE Brief Crackme1.004011E6 00401228. 68 8E214000 Drive Crackme1.0040218E; ASCII 'FaTaLPrId' 0040122D.
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E8 4C010000 CALL Crackme1.0040137E 00401232. 50 Press EAX 00401233. 68 7E214000 Drive Crackme1.0040217E; ASCII '123456' 00401238. Elizabeth8 9B010000 CALL Crackme1.004013D8 0040123D. 83C4 04 Insert ESP,4 00401240. 58 Put EAX 00401241. 3BChemical3 CMP EAX,EBX 00401243.
74 07 JE Brief Crackme1.0040124C This is certainly where the fun starts. We're performed with the User32 code and are usually back again with the main regimen of the Crackme. Olly also helps display us we'ré in the right place by displaying that our éntered username and password are moved to the stack before phone calls are made and a compare and contrast is produced shortly later on. For today, press Ctrl-N, choose 'GetDlgItemTextA' and push 'get rid of all breakpoints'.
After that choose the line 00401223 and press Y2 to place a fresh breakpoint here. What this indicates is that you can now come back here whenever you run the system without stepping through all the previous ways we have taken. You dont need to search for this once again if you press a wrong button somewhere!
So, we probably understand how we could obtain the congrats information - a flick of the Z bit at 00401241 or simple patch of the JE at 00401243 should do it. But that doesn't instruct us significantly, we desire to understand specifically what this crackme will be performing in purchase to test our username ánd serial. Our work is definitely to track the phone calls at 0040122D and 00401238 to discover out specifically what is definitely heading on here. Area 3 - The First Regimen - You should nevertheless be at 00401243. Push Y8 until you emphasize the subsequent row: 0040122D. E8 4C010000 Contact Crackme1.0040137E Today press N7.
The distinction between F7 and Y8 will be that F8 measures over calls and N7 measures into them. In other terms, if a contact is certainly of no interest to you, you can press F8 to action over it and have on.
If you think that it might include some essential information, push F7 to phase into it ánd you can look at it in fine detail. You should right now be here: 0040137E /$ 8B7424 04 MOV ESI,DWORD PTR SS:ESP+4; Crackme1.0040218E 00401382. 56 Drive ESI 00401383 >8A06 /MOV AL,BYTE PTR DS:ESI 00401385. 84C0 TEST AL,AL 00401387.
74 13 JE SHORT Crackme1.0040139C 00401389. 3C 41 CMP AL,B. 72 1F JB SHORT Crackme1.004013AChemical 0040138D. 3C 5A CMP AL,5A 0040138F.
73 03 JNB Brief Crackme1.0041391. 46 INC ESI 00401392.^EB EF JMP SHORT Crackme1.0041394 >E8 39000000 Contact Crackme1.004013D2 00401399. 46 INC ESI 0040139A.^EB At the7 JMP Brief Crackme1.004139C >5E Take ESI 0040139D. Y8 20000000 Contact Crackme1.004013C2 Okay, therefore we find at 0040137E that our username can be packed into ESI ready for control. The first character of our username (N in my case) will be then moved into AL before being examined to observe if it is definitely 0. Then the interesting stuff starts - at 00401389 the N is likened with 41.
A strange comparison you might think? Open up up a web browser window and move to and you'll get a much better understanding. The computer offers with personality ideals in hex i.e. Following to my N in Olly is the quantity 46. If you look at the ASCII table you will observe that 46 is certainly the hexadecimal portrayal of 'N' and 41 is definitely the representation of 'A'.
What the collection at 00401389 is usually doing after that, is usually its using the 1st letter of our username and evaluating it with A. The result of this evaluation effects what occurs at the jump on the following series (0040138B) as if the very first notice of our title is less than A (notice the ASCII desk) it jumps somewhere else. My N is usually above A though therefore we carry on to 0040138D. Here a identical operation is carried out. A quick look at our ASCII values shows us that our character is today being likened with Z - this time á jump is takén if the vaIue is abové Z. Certainly, my F is good and we keep on.
At 00401399 ESI is definitely incremented before a leap is taken back again to 00401383. If you keep in mind, our username is usually saved in ESI so this offers essentially simply relocated us to the next letter of our username and eliminated back to the beginning of this routine.
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My 2nd letter can be 'a' so lets observe how this is certainly dealt with. Well, moving through it passes the evaluation with 'A' as 61 is definitely indeed higher than 41(A). When we obtain to the comparison with Z .
though, it faiIs and thé jump is takén at 0040138F to 00401394. This is usually because, as the table displays, a(61) is usually higher than Z(5A). So we get here: 00401394 >Age8 39000000 CALL Crackme1.004013D2 Which in turn transmits us right here: 004013D2 /$ 2C 20 Bass speaker AL,20 004013D4. 8806 MOV BYTE PTR DS:ESI,AL 004013D6. C3 RETN So whats happening here? Our character is definitely in AL and gets 20 subtracted from it. Wháts this for?
Check out the ASCII desk. You will find that my 'a' can be 20 values increased than 'A' i.elizabeth. A-20=A; this subwoofer routine offers simply capitalised my character! It after that jumps back again to the regimen, amounts ESI to the following letter and continues. Action through the sleep of the regular and you'll notice that your entire username is processed to create certain its uppercase.
Tháts all this little bit is carrying out. My username can be now FATALPRIDE. A few of factors to take note though are usually that if you only used uppercase characters anyway, this schedule is redundant and you wont also notice the SUB AL,20 part. Also, if you have non alphabetic people in there, they'll become taken down 20 values too mainly because they certainly are not really between A and Z . Once the final notice of your username offers been processed, the TEST AL,AL will fail and the application gets out of this loop to 0040139C where your recently capitalised name is popped from the collection to ESI. Then arrives this line: 0040139D. Y8 20000000 Contact Crackme1.004013C2 Push F7 to trace this call - this will be the second routine.
Placing a breakpoint here may become useful as well! - Section 4 - The 2nd Schedule - When we trace the over call we get the sticking with: 004013C2 /$ 33FY XOR EDI,EDI 004013C4. 33DM X0R EBX,EBX 004013C6 >8A1E /MOV BL,BYTE PTR DS:ESI 004013C8.
84DM TEST BL,BL 004013CA. 74 05 JE Brief Crackme1.004013D1 004013CG. 03FC ADD EDI,EBX 004013CE. 46 INC ESI 004013CN.^EB Y5 JMP Brief Crackme1.004013C6 004013D1 >D3 RETN So whats happening here? Properly first of all EDI and EBX are X0R'd with themselves - yóu've handed enough difficulties to understand that this usually returns a 0 outcome therefore this is certainly simply a way of cleaning both EDI and EBX.
Then a identical thing occurs to what occurred in the over regimen - the only difference becoming that the very first notice of our capitalised username is definitely move to BL rather than AL. Its then tested incase its 0 before getting at 004013CM. If you've go through Trope't content, you'll know that BL (where our character is stored) is usually simply the lower storage in EBX. Therefore Put EDI,EBX is definitely using the value of that character and including it to EDI - certainly, we just focus'd EDI so for the first letter, its added to 0. We then increment to the next notice of our usérname and the procedure is recurring although notice that the cycle does not include the XOR features each time. This essentially has the effect of incorporating all the values of our username collectively and keeping it in EDl. For my usérname I obtain this: Y + A + T + A + D + G + Ur + I + Deb + At the 46 + 41 + 54 + 41 + 4C + 50 + 52 + 49 + 44 + 45 = 02DG At the finish of the username, we fail the Check BL,BL and leap out to the come back statement at 004013D1.
Our summed username (02DG in my situation) is still stored in EDI. Section 5 - Finishing With The Usérname - So the last collection of the over routine is definitely: 004013D1 >C3 RETN When we stage over this, it takes us back to the finish of the first regimen, to where the second routine has been known as from. We land here: 004013A2. 81F7 78560000 XOR EDI,5678 004013A8. 8BM7 MOV EAX,EDI Okay, therefore here we have got another XOR declaration - this time the items of EDI are usually X0R'd with '5678'.
We know that EDI includes our summed username therefore in my situation, this equation can be: 02DM XOR 5678 - the result is kept in EDI once again (54A4 in my situation) before the following statement moves it to EAX. We then jump back again to the initial program code we looked at in area 2. 83F8 00 CMP EAX,0 00401226.^74 End up being JE Brief Crackme1.004011E6 00401228. 68 8E214000 Drive Crackme1.0040218E; ASCII 'FaTaLPrId' 0040122D.
Age8 4C010000 CALL Crackme1.0040137E 00401232. 50 PUSH EAX 00401233.
68 7E214000 Force Crackme1.0040217E; ASCII '123456' 00401238. Elizabeth8 9B010000 Contact Crackme1.004013D8 0040123D. 83C4 04 Combine ESP,4 00401240.
58 Put EAX 00401241. 3BC3 CMP EAX,EBX 00401243. 74 07 JE SHORT Crackme1.0040124C The difference can be that we have got now completed the call at 0040122D and we're now at 00401232 waiting to carry on. Well done you've just tracked your initial contact and right now you recognize precisely how this applications functions a username!
Today notice if you can follow the exact same treatment for the second call beneath! Search for into it with F7 and find what you can discover. Fixed a crack point very first therefore that if you clutter up you can test once again or pick this guidebook up where you left off! - Area 6 - Beginning With The Serial - How did you get on? Permits discover out.
First of all we see EAX is definitely sent to the bunch (we know that this includes our summed usérname X0R'd with 5678 from the prior call) and after that our entered serial (123456) can be forced to the stack too. Ppsspp monster hunter portable 3rd. We can after that use F7 to trace our second contact.
We land here: 004013D8 /$ 33C0 XOR EAX,EAX 004013DA new. 33FF XOR EDI,EDI 004013DD. 33DN XOR EBX,EBX 004013DE.
8B7424 04 MOV ESI,DWORD PTR SS:ESP+4 004013E2 >N0 0A /MOV AL,0A 004013E4. 8A1E MOV BL,BYTE PTR DS:ESI 004013E6. 84DM TEST BL,BL 004013E8. 74 0B JE Brief Crackme1.004013F5 004013EA new. 80EC 30 SUB BL,30 004013EDeb.
0FAFF8 IMUL EDI,EAX 004013F0. 03FW Combine EDI,EBX 004013F2. 46 INC ESI 004013F3.^EB ED JMP SHORT Crackme1.004013E2 004013F5 >81F7 34120000 XOR EDI,1234 004013FC. 8BDF MOV EBX,EDI 004013FD.
G3 RETN The first three ranges should become no problem - we're eradicating the EAX, EDl and EBX registers by XORing them with themselves. Following this, our Serial quantity is moved into ESI and the control begins. Section 7 - Refinement The Serial - Só you should be at the beginning of the loop at 004013E2. Let us test and function out whats going on here. First of all, 0A (10) will be moved into AL and then the first personality of our seriaI (1 in my situation) is certainly shifted into BL before becoming examined for 0 in the usual way. Notice though that EBX contains 31 instead than 1 i.elizabeth.
The hexadecimal rendering of the character 1. After this, 30 is definitely deducted from our amount i.elizabeth.
31-30 in my case. Then EAX and EDI are multiplied and our processed character included to the result. This will be then stored in EDI. In additional terms, EDI holds (31-30) + (10x0) = 1; after one iteration on my serial. The procedure is after that repeated but this period, keep in mind that EDI is definitely no much longer 0 so when EDI is certainly increased by EAX, we obtain a various result.
1 (earlier version) + ( (32-30) + (10x1) ) = 0C Continue this trough the relaxation of your seriaI and we get a last result (1e240 in my case). Actually, what this offers done is certainly to transform our serial tó hex! So wé leap out of the cycle and property at 004013F5. This can be interesting - remember in the last call where the username was uppercased and XOR'd with 5678h?
Nicely right here we've just hexed the serial and today we're X0Ring it with 1234h (result is 1f074 in my case)! Simple really! The result is then shifted from EDI tó EBX and wé leap back again to our preliminary piece of code once again! - Section 8 - The Last Phases - This is definitely it. The final levels of the crackme. We leap back to here: 0040123D. 83C4 04 Add more ESP,4 00401240.
58 Place EAX 00401241. 3BM3 CMP EAX,EBX 00401243. 74 07 JE SHORT Crackme1.0040124C 00401245. Y8 18010000 Contact Crackme1.004124A.^EB 9A JMP SHORT Crackme1.004011E6 0040124C >Elizabeth8 FC000000 CALL Crackme1.0040134D The first line is a fast stack cleansing which after that leaves our prepared username value (54A4 in my situation) on the best of the collection. This is definitely then popped to EAX. After that comes the important evaluation: 00401241. 3BC3 CMP EAX,EBX EAX (the result of our username being prepared) and EBX are compared - the two values should appear familiar as they are the outcomes of our two phone calls i.e.
In my case they are usually 54A4 and 1f074. The following jump statement is the essential one - if the two ideals in EAX and EBX are equal, we jump to the call statement at the bottom level of the above code get. This is our success package! (Hence the cause I mentioned we could plot this jump to jump if not equal instead than if equivalent). If EAX and EBX are not equivalent, we dont jump and we are used down the 'Zero luck now there mate' routine - this is definitely where I go on this event as 123456 is certainly not really my correct serial. Section 9 - Determining Your Serial - So, we have got discovered that the essential operation can be a assessment of our processed username and our prepared serial. Particularly, our processed serial give the exact same outcome as our processed username in order to become legitimate.
So how do we accomplish this? Nicely, this is certainly where information of the XOR functionality brings us through.
We understand that: if A XOR W = C then Chemical XOR N = A new. So how can be this useful? Well, searching at the method the serial is processed, our entered seriaI in hex X0R with 1234 must result in our processed usérname (in my situation 54A4). Using the over reasoning then, our serial can be our processed username XOR with 1234 i.age. (for me) SeriaI for FaTaLPrIdE = 54A4 XOR 1234 5 4 A 4 = 0101 0100 1010 0100 1 2 3 4 = 0001 0010 0011 0100 SERIAL = 0100 0110 1001 0000 = 4690h Transfer to Decimal = 16 + 128 + 512 + 1024 + 16384 = 18064 (we require to perform this as we are usually treating the fact that our plan coverts the decimaI serial we inserted into hex). Hence I have username FaTaLPrIdE (not case sensitive owing to the uppercasing routine) and serial 18064.
Section 10 - Summary - So thats it! I wish you liked this and found it helpful.
Ollydbg Tutorial Pdf
As I say, I'm a complete newbie at this so I believed a beginners information composed by a beginner would be helpful to a few people. If you like this, just pop a remark below and let me understand.
Likewise, if you have a criticism or enhancement, I'd like to listen to it as well. Please wear't tell me it has been too basic though as that has been the point of the article - to clarify as much as I couId for those whó have got never utilized a debugger just before. I'm recommend trying crackme 2 if you get a opportunity. Personally, I think its easier than this one - make use of the exact same strategies and work out how your security password is being dealt with. I'll create a tutorial when I obtain a possibility, but sense free of charge to PM me if you desire a assisting hand before the article will be out. As yóu for you reading through this because level 8 is definitely bothering you, I wish this will help you out. Level 8 has a several extra methods up its sIeeve but if yóu've got that significantly, you should become able to sort through them.
Simply logically action through and function out exactly what is certainly occurring - create it down to keep note. Thanks a lot for reading through. Please dont reproduce this on some other websites - its composed specifically for the Geeks;-).
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Recommended Subreddits:. Cracking this system which seems to have got been composed in M and put together extremely cleanly is Jumps AND Range behind breaking actual commercial software program. If you're planning on to discover 3 basic gets when you open up Adobe Phótoshop in Olly yóu're also in for a little bit of a surprise.
I'm the first to confess that I'meters no change engineer, hell it had taken me 2 days to crack mIRC back in the day time, but entitIing this 'how tó break any software program.' Is certainly a bit stupid. That mentioned, I would end up being REALLY curious to notice a video of somebody breaking a legitimate item of industrial software.