the `mul` operation is a bit tricky because, first of all it has the destination operand implicit being eax, and second, if the result is greater than 32 bits, it memorizes the high portion into edx. this was not evident from the asm code. also notice the (long long) casting: in C we have to cast one of the operands (or declare them as long long) otherwise it would truncate the result to 32 bits, and the next bit shifting by 32 would return zero.
In the previous IDA Pro article, we took a look at the basics of reverse engineering source code and binary files. 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. IDA Pro is typically utilized to analyze the disassembled code of a binary so that the internal mechanism could be comprehended and identify the inherent vulnerability in the source code.
Crack code activation ebp
This tutorial requires thorough knowledge of Assembly Programming and Hex Code manipulation because patching binary with IDA Pro especially deals with assembly opcode instructions. Besides that, the reverse engineer is supposed to operate the IDA Pro Software IDE features perfectly. This operation lists the following tools of the trade:
This article exposes the demonstration of byte patching over a typical C++ binary which essentially required a user password to validate his identity and let him log into the system, and such confidential information is only provided to the registered person indeed. There is of course no direct method to breach into this application without being authenticated, except to reverse engineer or patch the critical bytes which are responsible for performing validation. The following code will make the binary executable live as binaryCrack.exe:
The patching or editing assembly code features are normally invisible in the IDA Pro. You can double check from the Edit menu that no Patch program options appeared. Thus, in order make this option visible, open the idagui.cfg configuration file of IDA Pro which is located at Drive: Program FilesIDA PRO Advanced Editioncfg folder and scroll down to find the DISPLAY_PATCH_SUBMENU option which is typically set to NO. So, do the following changes and save this file.
The hex view offers a 16 bytes sequence in one line and each two bytes represent only one assembly instruction set such that the hex value 75 35 belongs to .text: 0041140D address location where assembly code jnz short 10c_411444 is implemented as following.
Finally, we have concluded that hex code 35 is the key value that directing the execution flow of the program. However, select the address location 0041140D into text view and go to Edit menu, choose Patch program and select Patch Bytes over there. It will show the entire 16 hex bytes sequence alike to hex view:
As we can observe in the binaryCrack.exe, couples of strings messages are showing. We can access all these strings into place via String window (shift + F12) and can directly reach to its assembly code merely by clicking the string.
Product Activation is the process of validating the Product Key. Software authors may desire activation for any number of reasons. The two most prevalent appear to be developing end user demographics and thwarting piracy.
Retrieving the key from the keyfile would be accomplished as follows. patest3 loads the previously saved Public and Private Key pairs. Prior to running the sample code, the reader should copy key.pb and key.pv to the current working directory. It is noteworthy that the keys are not encrypted on the disk. It is left as an exercise for the reader.
The Crypto++ Library provides the user with sample code by way of the validation routines. Two such samples are RSASignFile and RSASignFile (located in test.cpp). The provided code will be the base for the Signing and Verification. However, rather than operating on Files, patest4 will operate on an in memory Message string. Note that the Signature is still written to a file.
The following two outputs show the results of sample five. patest5 Base64 Encodes the Product Key; and receives the same product key from the server. The changes to the Client are listed below (the Server is similar).
patest6 culminates this article. The Server program uses the Private Key to Sign the Product Key (not Encrypt), and the Client program uses the Public Key to Verify the Signature. The source code is a melding of the previous examples presented.
Both the Client and the Server share common function implementations. For example, Base64Encode() and Base64Decode(). The Server solely uses SignMessage(), while the same is true for VerifySignature() with respect to the Client.
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From the early days of the commercialization of computer software, malicious programmers, also known as crackers, have been continuously nettling the programmers of the aforementioned software by constantly bypassing the clever licensing mechanisms they have implemented in their software, thus causing financial damages to the companies providing the software. 2ff7e9595c
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