Unhandled Exception Filter

Created the Monday 18 March 2019. Updated 6 months, 2 weeks ago.

An application-defined function that passes unhandled exceptions to the debugger, if the process is being debugged. Otherwise, it optionally displays an application error message box and causes the exception handler to be executed.

If an exception occurs and no exception handler is registered, the UnhandledExceptionFilter function will be called. It is possible to register a custom unhandled exception filter using the SetUnhandledExceptionFilter. But if the program is running under a debugger, the custom filter won’t be called, and the exception will be passed to the debugger.

Therefore, if the unhandled exception filter is registered and the control is passed to it, then the process is not running with a debugger.

Technique Identifiers

U0108 B0001.030

Technique Tag


Featured Windows API's

Below, you will find a list of the most commonly used Windows API's that are currently utilized by malware authors for current evasion technique. This list is meant to provide an overview of the API's that are commonly used for this purpose. If there are any API's that you feel should be included on this list, please do not hesitate to contact us. We will be happy to update the list and provide any additional information or documentation that may be helpful.

Code Snippets

Detection Rules

Additional Resources

External Links

The resources provided below are associated links that will give you even more detailed information and research on current evasion technique. It is important to note that, while these resources may be helpful, it is important to exercise caution when following external links. As always, be careful when clicking on links from unknown sources, as they may lead to malicious content.

Sleeping Alien

Subscribe to our Newsletter

Don't miss out on the latest and greatest updates from us! Subscribe to our newsletter and be the first to know about exciting content and future updates.