Use Any Trial Software Forever! No Crack Needed
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API Monitor Tutorials — rohitab 5: Software cracking is the modification of software to remove or disable features which are considered undesirable by the person cracking the software, usually related to protection methods: This tutorial is for educational purposes only, so please do not use this to create or distribute a cracked copy of the software. When you first install the application, it prompts you for a license file.
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API Monitor Tutorials — rohitab 5: Software cracking is the modification of software to remove or disable features which are considered undesirable by the person cracking the software, usually related to protection methods: This tutorial is for educational purposes only, so please do not use this to create or distribute a cracked copy of the software. When you first install the application, it prompts you for a license file. After installing the license you have 30 days to evaluate the application.
The expiration date is displayed on this screen; in our case it is March 15, Step 1 Trial applications usually store license information in either the registry or on the file system.
Since this application prompted us for a license file, we know that it uses the file system. Step 2 Select Hook Process from the File menu to start monitoring the application. The application should now display a message indicating that it is an evaluation version. Hit cancel to quit the application. Step 3 Now that we have captured the API calls made by the application, we need to find the one that reads the license file.
Scan through the calls in the API summary view until you find the right one. The application is reading from mirial. Step 4 Modify the expiration date in the license file to and save the file. Now launch the application again. The application should now display an error indicating that the license is invalid. Step 5 Our next step is to start debugging the application right after it has read the license file.
The breakpoint will be hit multiple times; continue until you reach the one that opens the license file. Now hit Continue to let the application run. You should now be able to attach to the application using a debugger. Use the debugger to step out until you reach code in the application. Step 7 The debugger is currently at a location right after the application has finished reading the license file and before it checks the validity of the license.
We need to locate the code that performs this check and disable it. This is accomplished by reverse engineering the compiled program code using a debugger such as SoftICE, OllyDbg, GDB, or MacsBug until the software cracker reaches the subroutine that contains the primary method of protecting the software or by disassembling an executable file with a program such as IDA.
The binary is then modified using the debugger or a hex editor in a manner that replaces a prior branching opcode with its complement or a NOP opcode so the key branch will either always execute a specific subroutine or skip over it. Step 8 The value of register eax is 0, right after the function call. The application displays a different error message this time; instead of an invalid license, the application is telling us that it is unable to locate the file.
Step 9 Now that we have pinpointed the location where the application checks for a valid license, all we need to do is to play around with the values and jmp instructions to find one that works. In this case, inverting the jump instruction from je to jne tells the application that it has a valid license file.
Running the application with the modified code displays our new expiration date of March 15, Discuss this article here: Login now.
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Don’t attempt to do anything stated in this document! If you crack a program, and either sell the crack or offer it for free, it is a crime! 2. What is. A crack-me is a small program designed to test a programmer’s •Fill it with NOP’s(No Operation) and make this conditional jump not work. Crack means the act of breaking into a computer system. difference between what they do and what crackers do, the mass media has failed to understand Crack also means to copy commercial software illegally by breaking (cracking) the.