DEVICEIOCONTROL KERNEL DRIVER

From this value, there is often a switch-statement which selects different behavior depending on the control code. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of service , privacy policy and cookie policy , and that your continued use of the website is subject to these policies. I have started reversing this piece of malware. In this structure there is an array named MajorFunction , which is a set of function pointers that the kernel will call when userspace tries to do something with the driver e. Follow through can be practiced with the specific driver and specific version:

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I corrected the wuestion.

DeviceIoControl function

Open ollydbg handle window and find what does the handle point to 0x90 in the above paste – it points to a device: Return Value If the operation completes successfully, the return value is nonzero. DeviceIoControl does just that: In the real DriverEntryyou’ll want to locate where the MajorFunction entries are populated. And how can I continue stepping under ollydbg? A pointer to the output buffer that is to receive the data returned by the operation.

malware – how to reverse DeviceIoControl? – Reverse Engineering Stack Exchange

In this structure there is an array named MajorFunction deviceioclntrol, which is a set of function pointers that the kernel will call when userspace tries to do something with the driver e. Some device types are already define but kfrnel have defined our own code which is Since you posed the question, I assume you neither have a kernel debugging connection, nor the driver where that control code is sent for analyzing it, as answered by Jonathon.

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Remarks To retrieve a handle to the device, you must call the CreateFile function with either the name of a device or the name of the driver associated with a device.

For overlapped operations, DeviceIoControl returns immediately, and the event object is signaled when the operation has been completed. At some point it creates a service and starts it, then immediately it calls the function DeviceIoControl and the malware went from “paused” kernrl “running” under ollydbg. Sign up using Email and Password.

By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. As is the case with all synchronous calls.

Every MajorFunction calls come with the Device and the Irp pointers.

To specify a device name, use the following format:. From this value, there is often a switch-statement which selects different behavior depending on the control code. Be prepared to swim through a few structures! I’ve searched a little bit, and I understand that this function serves to communicate with the service it just had created. Having windbg installed can make things easier from here, but we will not use windbg at this moment as it has a steep learning curve. This article will cover the use of the DeviceIOControl function and deviceiocontrl both, kernel driver and userland application implementation.

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To get extended error information, call GetLastError. Process Explorer will show the address of the Device Object as noted by Ollydbg. Your application should call DeviceIoControl again with the same operation, specifying a new starting point.

I am going to use ollydbg 2. Sign up using Facebook.

Userland/Kernel communication – DeviceIoControl method « Eric Asselin

Device and symbolic link creation In order to enable communication between the driver and the application, a device must be created to let the application having a handle to it with the CreateFile function. Use the other CreateFile parameters as follows when opening a device handle:.

Sign up using Email and Deviceiocotrol. You cannot step into kernel mode from Ollydbg. As with file, you must close the handle with the CloseHandle function. Sign up or log in Sign up using Google. For example, to open a handle to the logical drive A: The real DriverEntry is usually jmp ‘d to at the end of this stub.