- #Disassembling code ida pro and softice how to
- #Disassembling code ida pro and softice update
- #Disassembling code ida pro and softice windows
PAGE: 00,010,494 MOV EAX, ebp + 8 happens to be in the position of parameter 1. PAGE: 0001048E However, none of the IDA parameters are displayed? do not really understand. PAGE: 0001048EMyUnload procnear DATA XREF: DriverEntry + 9 o I found out that if there is no source code, I really don't know what it means. If you need to change the instruction, you need to refer to the 8086 instruction operation table to write the corresponding hex form, and modify. The example only modifies the string, and only needs to change the content of the data segment, without changing the instruction. Run it again and you can see that the result has changed!
Copy the instruction displayed in the hexadecimal mode to be modified in IDA, open the search in UltraEdit, paste and search for the hexadecimal string, and UltrEdit will quickly locate the instruction, as shown in the following figure:įound the corresponding position of UltraEdit Now we have to change "a> 0" to "n> 0", the ASCII code corresponding to a is 61, and the ASCII code corresponding to n is 6E, just change 61 to 6E, Save it after modification. In order to find the actual address of the corresponding code snippet in UltraEdit, you need to use the search function of UltraEdit. The address displayed by UltraEdit and the address displayed by IDA are different. Open the program file directly with UltraEdit, UltraEdit will display the program file in hexadecimal mode.
#Disassembling code ida pro and softice how to
The following will use UltraEdit as an example to illustrate how to modify. After verifying the correct modification in IDA, you can use UltraEdit or HexWorkshop to modify the original program file.
#Disassembling code ida pro and softice update
But it should be noted that this way of modification does not update the original program file, but actually only modifies the IDA project file! IDA is only suitable for making some verifiable modifications, to ensure correctness, and then use other tools to modify the original program file. After modification, right-click and select to see the modified IDA view. In IDA, you can right-click window and select to modify the binary instruction. The code snippet that needs to be modified has been found, and the rest just need to change a to n. Click window at this time, it will switch to binary browsing mode and highlight the binary format instruction of the assembly code, as shown below As shown: The final code snippet shows the assembly instruction shown above is the code snippet we are looking for. The string at that position will be annotated with the words DATA XREF, which is the address of the code snippet that refers to the string in the program! Right-click on the line and select item, it will immediately jump to the position of the code snippet that references the string! Double-click the string in the string window to jump to position 00403003 in the IDA view, as shown in the following figure: Right-click in the string window, select the menu command, it will copy all the contents of the string window to the clipboard, and then paste it into Notepad to find it. If there are too many strings to locate and search with naked eyes, because the string window has no search function, you need to use other text editors, such as notepad, editplus, etc.
The program has fewer strings, and we can quickly see that the string "a> 0" we need is in the data segment 00403003.
#Disassembling code ida pro and softice windows
How to do? Use string windows and IDA powerful cross-references! Click the button on the toolbar, you can see the following program strings: Looking at the IDA view one by one can no longer effectively find the relevant execution code snippet. However, in actual processing, the program may be a few m in size. Looking directly at the IDA view, we can find the code snippet that needs to be modified. Printf ("a> 0") // IDA Pro will be used later to change 'a' to 'n' The following will explain how to use IDA Pro by modifying the output string of the sample program. The unique IDA view and cross-reference can easily understand the program logic and quickly locate the code snippets for easy modification. IDA Pro is a powerful disassembly software.