beradvanced.blogg.se - Wow64 process

Wow64 process windows 10#
Wow64 process windows#

In essence, this is the only documented method in the WDK to actually monitor PEs that are loaded to memory as executable code.Ī different method, recommended by Microsoft, is to use a file-system mini-filter callback (IRP_MJ_ACQUIRE_FOR_SECTION_SYNCHRONIZATION). _In_ PIMAGE_INFO ImageInfo // Information describing the loaded image (base address, size, kernel/user-mode image, etc) _In_ HANDLE ProcessId, // A handle to the process the PE has been loaded to _In_opt_ PUNICODE_STRING FullImageName, // The image name

These parameters can be seen in the prototype definition of the callback function: When invoking the registered notification routines, the kernel provides them with a number of parameters in order to properly identify the PE image that is being loaded.

Runtime loaded PE images – import table, LoadLibrary, LoadLibraryEx, NtMapViewOfSection.

System DLL: ntdll.dll (2 different binaries for WoW64 processes).

There are several cases that will cause this notification routine to be invoked: This mechanism notifies registered drivers, from various parts in the kernel, when a PE image file has been loaded to virtual memory (kernel\user space).

Wow64 process windows#

It’s why Microsoft introduced PsSetLoadImageNotifyRoutine, in Windows 2000. Hooking? Maybe… but there are many security and implementation deficiencies. Say you are developing a driver, you would like to be aware of every module the system loads.

Wow64 process windows 10#

This flaw exists in the most recent Windows 10 release, as well as past versions of the OS dating back to Windows 2000.

The thing is, after registering a notification routine for loaded PE images with the kernel, the callback may receive invalid image names. After digging into the matter, what started as a seemingly random issue proved to originate from a coding error in the Windows kernel itself. Introductionĭuring research into the Windows kernel, enSilo’s Threat Intelligence team (now part of FortiGuard Labs) came across an interesting issue with PsSetLoadImageNotifyRoutine, which as its name implies, provides notifications of module loading. A FortiGuard Labs Threat Analysis Report : This blog originally appeared on the enSilo website on September 05, 2017, and is republished here for threat research purposes. enSilo was acquired by Fortinet in October 2019.Ī programming error in the Windows kernel could prevent you from identifying which modules have been loaded at runtime.