On a single workstation, open the default apps and then click on “Choose default apps by file type”. Here’s another method that has been around for many years: You can reassociate a given file type with another file type. Reassociate untrusted file types with another file type For web-based portals, you can easily do this by documenting what is and is not allowed on the site. Clearly communicate to your users what file types are and are not allowed.

You should also regularly review the files you allow through firewalls, email, file transfers and any other means. Review all the file types you block on a regular basis and allow only those file types you want to receive. There is no logical reason to be receiving or sending JavaScript files to the average user. Block JavaScript at the email gatewayįirst and foremost, block.

You have several options to block or change the default behavior to better protect workstations. When the user clicks on the upgrade option, a JavaScript file is downloaded and executes malware. There have been several recent reports of fake updaters that spoof Google Chrome, Mozilla Firefox, and Internet Explorer landing pages.

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