You should now be on code at location 0x00401055. The Windows window displays the Handle, Title, Parent Window, Window ID, Window Style, and Window Class Information for each window owned by the process. I selected. After completion, the following screen comes up: Let’s leave the “Run the app” checked and see what we’re dealing with: Well that’s not very nice. Setting breakpoints on these API’s will help you navigate quickly to those parts of code that have anti-debugging checks so you can defeat them. Go ahead and install the app. Change ), You are commenting using your Google account. Now quit Olly and run the app and experience it is all it registered glory!!!!! Now we will attempt to find the time limit checking code. So this is basically another registration check, and if it fails if puts a zero in the registered/not-registered flag. Lets name it worldtv2.exe we will refer to it later. Make sure the Hex option is checked and the Beginning of File option is checked. When you only have 2 characters left to go stop pressing the Run button and just step through the code. Hit the “Copy all” button in the resulting dialog box as shown in Figure 24 and Figure 25. That will make it all the easier to crack. This article demonstrates one way to challenge the strength of the copy protection measure using OllyDbg and identify ways to make your software more secure against unauthorized consumption. Two recommended plug-ins you should get are OllyDump to dump a process’ memory and Olly Advanced to get around any anti-debugging a malware sample may throw against you. So here’s what we do- highlight the two compare and jump instructions: Then right-click and choose “Binary” -> “Fill with NOPs”: This step isn’t required, but it makes it a lot easier to see what you’re doing. This key single-step traces one instruction at a time. After the file has been disassembled, we will look for the string from the messagebox. In this case rather than jumping on bad serials we want the program to jump on ANY serial. In the OllyDbg menu bar, go to Options, then Debugging Options: Soon you will get to the main screen: and you will see that we are still registered. OllyDbg’s Memory Map window shows the virtual address, the virtual size, the owner module, section names, memory allocation type and memory protection for each allocated region of memory in the process. Close WorldTV2.exe and open it back up again. The window shows the virtual address of all software breakpoints currently set, the active status (always, disabled), and the disassembly instruction of the breakpoint. Go back to PUSH 10 by pressing hyphen (~) and repeat the previous process for the instruction 0x00401063 as following; Now save the modifications by right clicking in the CPU windows. Press Validate Registration and… Success! Instead, we will use the power of the debugger to help us locate the error message. This will take you to the jump command at 0x401060. Rather than stepping through the code line by line we are going to set a breakpoint on MOV EDI,WorldTV.004C8950 and watch our serial come together. To be totally honest, after cracking the program in this tutorial, I liked it so much I paid for the registration and now use the app legitimately. A lot of times it will contain strings and or ideas for reversing. So patching that one check does not make us registered, although if you click OK and zero out the flag one more time, you will notice that it does take off the “unregistered” title of the main window: So at least we know we’re on the right track. So, the first task is to identify its origin. What we hope is that this is the only check that the app is registered or not. Right click the compare and choose “Follow in dump” again as Olly has reset the dump window. The security researcher must have rigorous knowledge of Assembly Programming language. What we need to do is find where this is being set and make sure it doesn’t happen. Scroll down until you find WorldTV and click on the folder. The CPU main thread window displaying the software code in form of assembly instructions which are executed top to down fashion. Say we downloaded a trial piece of software that expires after a certain date or after 30 days. F8 – the Step Over command. Let’s try our string search. It is expected that their machine must be configured with the following tools; When the source code is not provided, it is still possible to patch the corresponding software binaries in order to remove various security restrictions imposed by vendor as well as fix the inherent bugs in the source code. As you can see in Figure 12, the following “trial” software is expired and no longer working. Now, you can find the time limit code. So, first select the Go to JA 00401055 from the context menu. Open up WorldTV2.exe in HexWorkshop. Note the yellow “Paused” message in the debuggee status. Validate the serial and then close WorldTV. I renamed our fixed CrackMeDemo software and saved it to the desk top. If you need to do some trouble-shooting during your debugging session, the Log Window may be useful in tracking down unusual or unexpected behaviors while stepping through mal-code. Introduction to Cracking with OllyDbg from Scratch (Spanish: INTRODUCCION AL CRACKING CON OLLYDBG DESDE CERO) was written by Ricardo Narvaja (belongs to the mailing list CrackSLatinoS) from Spanish, who has written more than 2100+ tutorials about SoftICE (old course on Windows 98) and OllyDbg (new course on Windows XP). Press Run once more and we are now here: And ECX now holds the ASCII value “RegCode”. We are going to patch it to think it is registered. People put a great deal of time into apps and they deserve to be compensated. One type of copy protection common in trail or beta software, allows a program to run only until a certain date. OllyDbg has many context menus. Open the CrackMeDemo.exe program in OllyDbg. What we are going to have to do is step this up to the next ‘level’ and investigate a little further. If you liked this post, feel free to share it with others who may be interested in learning the art of reverse engineering. This “>” symbol indicates that other parts of code jumps to this location. Go to your Start menu and find the Run command. Change ), You are commenting using your Twitter account. Reversing with Olly. This time, we have to elect some different approach to crack the native executable. Press Run again to see if there is another set of characters to be added. We are going to start with checking the registry. The goal today is to provide a tour of OllyDbg and how the tool can be used in reverse engineering software or malware. Now run the app. In the right pane we have a key called RegCode with our bogus key: 1234567 stored in it. That information is found at the bottom of the w32dasm window. As you can see, the following trail software application is expired and not working further and showing an error message when we try to execute it. While in the Names window, you can right-click on any of these functions names to toggle a break point (Right-click -> “Toggle breakpoint” or press the F2 key). Clicking on the about screen shows: Congratulations. Crack with ollydbg cracking software cracking software like a pro debugger hacking software ollydbg pirated software cracking Reverse engineering software pirates If you’ve ever wondered how software pirates can take software and crack it time and time again, even with security in place, this small series is for you. Now press the Run button a few times and we can watch our serial build itself. OllyDbg is a general purpose Win32 user-land debugger. When used on a CALL, F8 sets a breakpoint after the CALL and runs the debuggee. By hitting F9 to run the debugger, we should encounter the error message as seen in Figure 16. Figure 23: the JNZ instructio is filed with NOPs. OpenRCE (www.openrce.org) has OllyDump, Olly Advanced, and many other useful plug-ins to help hide the debugger from malware attacks or to help automate your dynamic analysis process. It looks like as following; Now open the SoftwareExpiration.exe program in OllyDbg IDE from File à open menu and it will decompile that binary file. This will bring up the assemble window. Create your own unique website with customizable templates. Olly will disassemble the binary file and it will look something like Figure 15. Highlight everything we changed, right-click and select “Copy to executable”. First thing first, download OllyDbg from its official website and configure it properly onto your machine. Re-start the app and Olly will break. Your ultimate objective is to prevent the program from hitting the error code path. Don’t forget to save it back to disk. Right-click, choose “Search for” -> “All referenced text strings” and the search window will open. Notice at the line highlighted in Figure 19 the “>” symbol. After a little more stepping through we find that we are in a loop. So this can be accomplished by changing the JA instruction to NOP (no operation) which actually do nothing. Binary edit the first memory location to 01. The context menu in the previous figure shows that both 00401055 and 00401063 contains JA (jump above) to the PUSH 10 used for message box. We are going to patch the jump that returns the invalid registration box. Fill in your details below or click an icon to log in: You are commenting using your WordPress.com account. During this phase, we are looking for keywords, recognizable method calls, stuff like that. ( Log Out / The more you do this the more clues will jump out at you: Here we see the word “unregistered” again. This means that somewhere in the app, a secondary check was done that reset our registered flag back to zero. Next press F12 in order to pause the code execution so that we could find the code that causes the error message to be displayed. For example, if you see functions opening an internet connection and downloading files from an URL, the sample may be a downloader. Go ahead and write this number down. Like all commercial programs, if you plan on using them, you really should consider buying it. 2. The Window with the disassembly and byte-code instructions is called the CPU window, there is a window that shows the current register settings and the EFLAGs register settings, the hints pane will display useful information such as register or address values while single-stepping through the code, you can always view the memory contents of data and registers in the memory view window, and the stack window shows the current stack setup during your debugging session. Construction Estimating Software Free Trial. We obviously don’t want this to happen. One way to look for our error message is to examine the current call stack since the error message is currently displayed at this point. Let’ try it. Ok. Now view the call stack by pressing the Alt+ K. Here, you can easily figure out that the trail error text is a parameter to. Open up worldtv. If it does, we need to set a hardware breakpoint on it instead. See the figure below for the Threads, Windows, Handles, and the SEH windows. Next click on the CPU tab and make sure the boxes highlighted in Figure 11. Paying attention to EDI earlier we know that our serial is either 4 sets of 8 characters or 3 sets of eight characters. F2 – Set Breakpoint sets a software breakpoint on the currently selected instruction. It is shareware and it is available here. This program has a time restriction, and after this time, it will not work anymore. Next go back to the PUSH 10 instruction of the MessageBoxA by pressing the minus sign key (-) and repeat the process for the JE from 0x401064. Posted by Eric Hokanson in Malware RE, Reverse Engineering, OllyDbg Tutorial, Reverse Engineering, Reverse Engineering Malware. Now press the Run button ‘>’ You will first break at FF15 0C304400 CALL DWORD PTR DS:[<&ADVAPI32.RegQueryValueExA>]. We can tell for sure by running an ID program, but we’ll get into that in a future tutorial. This routine is called before our original break. With our tour of Olly behind us, we are now ready to start doing some real work: reversing and cracking a “trial” piece of software.
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