- #Ida pro 7.0 how much does it rebase driver#
- #Ida pro 7.0 how much does it rebase manual#
- #Ida pro 7.0 how much does it rebase windows 7#
#Ida pro 7.0 how much does it rebase windows 7#
The reason for this is because different patches and updates may end up changing the offsets and locations of various functions within a DLL, such as the msvcrt.dll DLL we use in this tutorialm which would mean that even if I was to target, say a Windows 7 machine, I would have to change the offsets every time that machine was updated or patched. We can then use static analysis and IDA Pro to confirm what we discovered in WinDbg.Īlternatively, we can change the base address in IDA Pro by selecting Edit ▸ Segments ▸ Rebase Program and changing the base address value from 0x00100000 to 0xf7c47000.Update (01/28/15): As pointed out by Gorlob on /r/netsec ( ), this techique may not work between different build versions of a given DLL. For example, if the base load address in IDA Pro is 0x00100000, then we navigate to address 0x00100486 to find the unload function in IDA Pro. We subtract 0xf7c47000 from 0xf7c47486 to get the offset (0x486), which we then use to navigate to the unload function in IDA Pro. Īs you can see, the file is loaded at 0xf7c47000 at ❶, and from earlier, we know the unload function is located at 0xf7c47486. We must calculate the offset of the function from the beginning of the file as it is loaded in WinDbg using the lm command, as follows: kd> lm start end module name.
#Ida pro 7.0 how much does it rebase manual#
However, the function location in WinDbg is different than the function location in IDA Pro, so we must perform some manual calculations in order to view the function in IDA Pro. In many cases, it’s easier to analyze a function in IDA Pro once you have identified where the function is located, because IDA Pro does a better job of analyzing the functions. If the unload function at 0xf7c47486 were long or complex, it would have been difficult to analyze in WinDbg. This disables the Windows XP firewall from the kernel in a way that is difficult for security programs to detect. We see that the program calls the RtlCreateRegistryKey function three times to create several registry keys, and then calls the RtlWriteRegistryValue twice to set the EnableFirewall value to 0 in two places. At this point, we can go to the kernel debugger to step through the code. Immediately, the entire guest OS freezes because the kernel debugger has hit our kernel breakpoint. Then we return to the version of WinDbg running on the executable on our virtual machine and resume it as well. Having set the breakpoint, we resume running our kernel.
Then we set a breakpoint using the following command: kd> bp 0xf7c47486
#Ida pro 7.0 how much does it rebase driver#
We’re trying to identify the function called when the driver is unloaded-information at offset 0x034, DriverUnload, as shown at ❶.
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