What AppNee wants to emphasize is: on the one hand, as a matter of fact, IDA Pro has become the standard tool for analyzing malicious codes, which also make itself be an important method in the study field of software cracking rapidly. Its pros are more perfect. This rare dissertation committed to impart cracking and byte patching in a binary executable using IDA Pro with the intention of subverting various security constraints as well as generating or producing the latest modified version (Patched) of that particular binary. In short, as an interactive, programmable, extensible and multiple-processor supported analyzing program on Windows or Linux platform, IDA Pro has long been recognized as the best disassembly tool in the software decoding/cracking field. The IDA Disassembler and debugger is a multi-processor disassembler and debugger hosted on the Windows, Linux and Mac OS X Platforms. IDA Support: Freeware Version Hex-Rays Home IDA Support.

In this article, we will find out how to use the to disassemble, debug, and break a simple crackMe software. Yóu may download á duplicate of crackMe. Basically unzip, load into IDA Pro, and follow together.After unzipping the focus on binary and operating itIn our scenario, we have got a piece of software that is asking for a passphrase or essential to open it. Since we put on't understand the appropriate passcode, the software exits with a “wrong password” information. All can be not lost. This is usually the power of opposite executive and using tools like as IDA Professional's disassembler ánd debugger: we don't need the source code to find out how the software works. With simply a debugger ánd a disassembler, wé can frequently extract tips and learn a great deal about the our target software.After installing your IDA demonstration.

Double-click tó the IDA demonstration icon and you should notice a windows like below:Go for the “New” switch and after that open up your crackMe binary:Then click Okay on the “Lóad New File” Windów:IDA will request if you desire to change to “proximity see now”, merely click on the “No” key. You should discover a home window similar to the scréenshot below:At thé pretty top is certainly the selection band. It gives a design of the binary as loaded in the virtual address space of storage. The darkish blue artists pertain to code or functions created inside the binary. The gentle blue companies send to functions that arrive from a collection (e.g.

The Chemical run period collection), and the pink area pertains to Home windows APIs that are usually packed by Dynamic Link Your local library (DLLs).The containers on the remaining side contain a functionality windowpane and a chart overview home window. Both can be used to rapidly navigate to places of code that might end up being interesting to investigate. The middle window contains a call graph of the whole binary. You can change from this call graph view to a toned source program code see by striking the space club. The space bar will toggle back again and on between contact graph look at and level see.Before examining the source code, allow us very first set up IDA'h debugger. In the menu bar, select Debugger, after that at the dialog box, choose the Regional Gain32 debugger.Once the debugger is set, the natural debugging arrow should be triggered.Before we start debugging, allows navigate around the program code to discover some interesting landmarks.

Right at the begin, we can see a call being produced to a Home windows API, IsDebuggerPresent. Regarding to the, this function establishes if the calling process, we.elizabeth. CrackMe, is usually getting debugged by á user-mode débugger. It pieces EAX to 1 if the getting in touch with process will be becoming debugged. It sets EAX to 0 if the calling process is usually not being debugged. If we were to start the IDA debugger (green arrow switch or hit N9 key), crackMe basically exits.

So we will possess to deal with this typical anti-debugging technique.Scrolling down a little ways, we find what looks to become a command word prompt wondering for the passphrase and after that some kind of assessment routine. Take note the hard-coded chain that is definitely shifted into the ECX sign-up:It looks like this evaluation routine is certainly comparing the user's control line input to the hard-coded line “ericroolz”.Just by static exam, we maintained to acquire the passphrase. We can test that by operating crackMe from the order collection and writing in “ericroolz” ánd we should obtain the “Correct password” message.

That is usually one method to defeat this example. But imagine we did not observe the passphrase, perhaps it had been obfuscated or encrypted, or left in thousands of thousands of lines of code. All can be not lost, we can make use of IDA't debugger to stage to this essential choice point:Then we can change the results of EAX ór the JNZ order to generally take the path to the appropriate password information. But first, we are usually going to possess to offer with the IsDebuggerPresent check at the begin of this program code. First, allows fixed a split point at the pretty begin of the plan, like in thé screenshot below (hit the N2 essential and you will see a crimson band indicating the break point is certainly established):Now hit operate or F9.

We should break:While we are at this break up, strike the ‘H' essential and type “kernel32IsDebuggerPresent” in the resulting dialog box. It is important to possess the kernel32 and the emphasize along with thé IsDebuggerPresent):you shouId blowing wind up here:Next, established a separate stage (F2) at the “retn” instruction at tackle 7C8130B0:Right-click on that crack point and select “Edit Breakpoint”. ln the resulting diaIogbox, you desire to set the situation of EAX=0 and unselect the Separate (under Activities) check box. Next click Fine:,We are placing the separate stage in such a way that we are not really suspending the program when we hit the break up stage, but merely placing the come back worth (kept in EAX) fróm IsDebuggerPresent to always be 0, that is definitely, regardless of the truth that we are operating crackMe in IDA's i9000 debugger, the problem will constantly return false and we will mislead the program into carrying on with with our debug session.Next, strike the ‘Gary the gadget guy' essential once again and kind in ‘eip' in the container.

This will get us back to our current break stage, that is usually, to where the present instruction tip is directing to:Next, we are going to wish to get around to that crucial decision stage we noticed earlier during our stationary analysis:So let us move to loc401067 and fixed a split point right now there. We can use the ‘Gary the gadget guy' key and kind in the tackle to consider us there:Now after hitting F9 again, the debugger operates to this break up stage we simply set.

Open the producing command screen and enter any passphrase you desire (I entered in “whatever” then strike the enter key):After typing any phassphrase, we strike the breakpoint. Take note the value in the EAX register. The TEST EAX, EAX training is checking whether EAX is 0 or not. Since it is definitely 1, the JNZ order will jump us to the incorrect password message. We wear't desire that.

We can perform one of twó things:1. We can modify the value of EAX by highlighting the EAX sign up, correct clicking and selecting the “Zero vaIue”. This will alter EAX to 0 and we will get the route to the right password information.2.

We could stage past the TEST EAX, EAX instructions and pause on the JNZ education. If EAX was 0, the TEST coaching would established the no flag (ZF = 1) but since what I typed in won'capital t go with “ericroolz” either, the zero flag will not really be arranged (ZF=0). We can merely change the zero flag by right clicking on the ZF value and selecting “Increment vaIue”. This will incrément the ZF tó 1 from 0, hence leading to the JNZ teaching to consider the appropriate password message.I will show method quantity 1. You may re-run this example and test technique 2 if you wish. Right-clicking ón the EAX vaIue:We will just 0 out EAX:Note that the EAX value changed to 0 and if we single action past the Check instruction:You should see the crimson arrow directing to the proper password message flashing.

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That suggests that we will take that path after establishing EAX to 0. If we keep on to run the debugger (F9) we should notice that even though we clearly entered the wrong key, we nevertheless were able to “unlock” óur program:Now thát we understand the essential decision stage, we could use an publisher like as OllyDbg and modify the JNZ training to something that will always leap to the right message location no issue what passphrase is certainly typed in.Although, this illustration was rather basic, it will illustrate the power of using a disassembler ánd a debugger. Also though we perform not possess the source program code, that do not avoid us from studying how our focus on binary worked.

Once we grasped how our bináry worked, we were able to adjust it into “unlocking” itself.