DeviceIoControl does just that: How do I know what it does? Process Explorer will show the address of the Device Object as noted by Ollydbg. I assume the malware is running already as your query states that you are on DeviceIoControl. It can be seen as event callback used to handle the device status and all IRPs created.
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To get extended error information, call GetLastError. Post as a guest Name. For overlapped operations, DeviceIoControl returns immediately, and the event object is signaled when the operation has been completed.
How to as DeviceIoControl() for kernel mode driver | Windows Vista Tips
If this parameter is not NULL and the operation returns data, lpBytesReturned is meaningless until the overlapped operation has completed. The real DriverEntry is usually jmp ‘d to at the end of this stub.
The control code for the operation. This control code checks for an incompatible version of driver loaded in memory.
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At some point it creates a service and starts it, then deviveiocontrol it calls the function DeviceIoControl and the malware went from “paused” to “running” under ollydbg. But what kernel mode?
Help us improve the wiki Send Your Comments. Post as a guest Name. Kermel more information, see Remarks. Sign up using Email and Password. When a driver is first loaded, its DriverEntry function will be called. To keep it simple, the Irp contains the IOCTL, the message from the application as well as a place to put the driver answer.
How do I know what it does? DeviceIoControl does just that: A very important concept to understand is the MajorFunction array found in the kernel driver object.
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. You cannot step into kernel mode from Ollydbg. Google “windows drivers asynchronous device io request” and take the first hit. This value identifies the specific operation to be performed and the type deviceioontrol device on which to perform it.
I assume the malware is running already as your query states that you are on DeviceIoControl. Here we simply deviceiocontrll our driver which function to call if an IRP event occurs. I have started reversing this piece of malware.
Sends a control code directly to a specified device driver, causing the corresponding device to perform the corresponding operation.