MAP: files that contain information about symbol names from the executable.Ida can be used to produce the following file formats: Let’s describe what each of the options in the Produce file can be used for. We can see that Ida is capable of creating various file formats, like ASM, EXE, HTML, C, etc. ![]() All the options are presented on the picture below: Let’s also take a look at the options that can be accessed through the File – Product file menu option in Ida. So far, we’ve seen three possible ways to change Ida’s database file, and at most, we’ve been able to change 16 bytes at once. We can see that the first two instructions are “mov eax, 10” as we’ve inputted them in the assembly dialog box. If we switch to assembly view, we can see the instruction as presented on the picture below: ![]() We can see that the “mov eax, 10” instruction is automatically converted to bytes: B8 0A 00 00 00, which we can see displayed at the beginning of the previous picture (with the brown background). If we open the assemble dialog and enter a “mov eax, 10” instruction in there twice, we’ll get the following hexadecimal instructions: We can only input one instruction at a time though. With the Assemble dialog, we can input the actual assembly instructions into the input box and the instructions will automatically be converted into the corresponding hexadecimal bytes, which are saved at the virtual address location. This clearly makes the previous dialog more useful, because we can change more bytes at a time.īut there’s also a third option to patch Ida’s database file which is accessible through the Edit – Patch program – Assemble menu option. We can see that this dialog only enables us to change two bytes at a time, while the previous allowed changing 16 bytes. If we close the dialog box without changing any bytes and open another with the Edit – Patch program – Patch word menu option, we’ll be presented with a dialog that we can see below: ![]() These bytes never change even if we modify the same 16 bytes located at the same virtual address multiple times they always reflect the bytes from the original binary executable. And the “Original value” presents the original 16 bytes located at the current virtual address. The “File offset” presents the number of offset bytes at which the presented bytes lie in original binary executable. The “Address” here presents the virtual address where our cursor is currently located. In the picture above, we can see that the first 16 bytes are indeed the exact same ones as on the picture below. If we now press on the Edit – Patch program – Patch bytes, a new pop-up window will be displayed presenting the first 16 bytes from the beginning of our cursor, which is located at the address 0x004011E5. We’re currently located at the first byte 0x91 at address 0x004011E5. Let’s first switch to the hexadecimal view, which can be seen on the picture below: The Edit – Patch program – Change byte option can be used to change one or more bytes in the Ida database. If the Patch program submenu in the Edit menu is not present, we need to change the idagui.cfg configuration file and change the DISPLAY_PATCH_SUBMENU configuration option to YES as we can see on the picture below:Īfter that, we need to restart Ida for the Patch program submenu to become available. We can use the options presented above to change the Ida database, which we can later use to create a new patched binary executable. With these options, we won’t actually change the binary executable itself, but only the database representation of the executable that Ida uses for reversing. On the picture above we can see three options: Change byte, Change word and Assemble, which can be used to change the database that Ida uses for representing the binary executable. Let’s first take a look at the Edit – Patch program options, which can be shown on the picture below: idb archive database and can be used by reverse engineers. Because of this, the binary executable is no longer needed to debug and execute the program everything is saved in the. Ida’s primary purpose is not binary patching, because when you first load the binary, it takes a snapshot of the binary and builds an internal representation, which is saved in the.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |