Hooks.dll virus

More details on how to use the library is available further in the article and on the Mhook home page. To do this, the latest version of the Mhook sources is required, which will be added to your project. Please note, any precompiled headers must be disabled for Mhook files. As we have already said, to provide an API hooking example, we will make the calc. As we cannot find the full information in the winternl. The creation and initialization of a global variable allows us to store the address of an original function:.

After a function has been hooked, first it calls the original function. Then we examine SystemInformationClass. In case it reveals to be SystemProcessInformation, in the list of running processes, we need to find and remove all records related to calc. Please note that the original and hooked functions must have identical signatures.

After that, examine the processes in the Windows Task Manager: the calc. In order to allow these various components to correctly interact with each other without causing conflicts, Application Programming Interfaces or APIs for short are used.

But what if I were to install a third-party software that spell-checks my input as I type? This is called Hooking —the process by which an application intercepts an API call between two other applications. In the example above, the intercepting function called a hook procedure altered the data passed onto the recipient the text editor , but that is not always the case. To enable this behavior, Windows supplies developers with a mechanism for intercepting events, messages, and certain API calls, called hooks.

For each hook, Windows handles a separate hook chain , listing the pointers to all of the hook procedures associated with it.

When an event occurs that is monitored by a hook, such as the aforementioned keystroke event, the OS calls the first procedure in the hook chain.

This procedure executes, then either invokes the next procedure in the hook chain or breaks it. Notice that some hooks only enable the chain to monitor the data flow but not to change it. These hooks also do not enable subordinate procedures to break the chain. Hooks can either be global —meaning they apply to all relevant events within the scope of their desktop, or thread-specific.

If the hook is global, the hooked procedure must be stored in a separate DLL file, so different threads can share it. In the description above, the Windows SetWindowsHookEX was used to hook a function, but other methods exist that do not rely on this function. As executables run, they may require loading shared DLL modules to extend their functionality. However, the memory addresses of these modules and the required functions within them are bound to change across different endpoints and OS releases.

Because of that, executables need a way to dynamically locate their required DLLs during runtime. However, the IAT can be used to hook functions listed within it.

When performing IAT hooking , the pointers in the table are replaced with pointers to hook procedures. That way, all calls from the executable to the original function are actually directed to the hooked procedure, which now runs as a man-in-the-middle between the executable and the hook.

Lisandro Avast team Certainly Bot Posts: Can you inform the file as being a false positive? To know if a file is a false positive, please submit it to VirusTotal and let us know the result. VirusTotal has a file size limit of 10Mb.

You can use VirScan also. If it is indeed a false positive, send it in a password protected zip to virus avast. Please, mention in the body of the message why you think it is a false positive and the password used.

Maybe you need to disable Hide protected operating system files and enable View hidden files and folders to manage the file s. As a workaround, you can add these files to the Standard Shield provider on-access scanning exclusion list. Left click the 'a' blue icon, click on the provider icon at left and then Customize. Go to Advanced tab and click on Add button A hook procedure passes an event to the next procedure by calling the CallNextHookEx function.

Note that the hook procedures for some types of hooks can only monitor messages. A global hook monitors messages for all threads in the same desktop as the calling thread. A thread-specific hook monitors messages for only an individual thread. A global hook procedure can be called in the context of any application in the same desktop as the calling thread, so the procedure must be in a separate DLL module.

A thread-specific hook procedure is called only in the context of the associated thread. If an application installs a hook procedure for one of its own threads, the hook procedure can be in either the same module as the rest of the application's code or in a DLL. If the application installs a hook procedure for a thread of a different application, the procedure must be in a DLL. For information, see Dynamic-Link Libraries. You should use global hooks only for debugging purposes; otherwise, you should avoid them.

Global hooks hurt system performance and cause conflicts with other applications that implement the same type of global hook. Each type of hook enables an application to monitor a different aspect of the system's message-handling mechanism. The following sections describe the available hooks. The structure contains the return value from the window procedure that processed the message, as well as the message parameters associated with the message. Subclassing the window does not work for messages set between processes.

The value the hook procedure returns determines whether the system allows or prevents one of these operations.