A fantastic web service called VirusTotal will quickly scan any file on your system with dozens of popular online virus scanning engines. VirusTotal will now begin scanning the file with all the scanning engines at its disposal. If you suspect a false positive you can perform a Google search on the file name to see if you can find a forum post discussing the file in question. There will often be one. If several of the engines mark it with a red X that means it almost certainly infected. I recommend that you delete the file without opening it.
Bottom line: I check every file I download with VirusTotal before I click on it or open it, regardless of where I downloaded it from. The VTzilla Firefox plugin adds options to Firefox to scan files at the Virus Total service without downloading them to the local system first.
It can furthermore scan websites and urls with popular website scanners, and search the Virus Total database for file hashes and other data. Non-Firefox users can rejoice as well, as it is now possible to submit websites and hosted files at the Virus Total website as well, to perform the same checks that the Firefox add-on offers. Back to the Firefox add-on.
The add-on basically automates part of the process of scanning files hosted on websites for malicious code. The extension installs a toolbar, and options in the right-click menu. The toolbar offers two interesting options. For one, the ability to search the Virus Total database. This is done by entering a keyword into the form and clicking on the Search VirusTotal button. Users can search for file hashs supported are md5, sha1 and sha , urls, user accounts and user comments.
There is unfortunately no option to search directly for file names. The second button scans the website's url with various services to determine a threat level. The right-click context menu can be used to send urls or files directly to the Virus Total service to scan them there for viruses and other malicious contents. Most Firefox users will probably disable the Virus Total toolbar in the browser, considering that only the search option offers unique features in comparison to the context menu option.
The Firefox add-on furthermore adds an option to scan file downloads with Virus Total. This option is displayed directly in the file download window, and can be selected before the download starts. The Firefox add-on has many advantages over manually using the Virus Total website. After it's marked as malware, the user can't open the synced file anymore from their local machine.
Microsoft organizations that have Microsoft Defender for Office included in their subscription or purchased as an add-on can enable Safe Attachments for SharePoint, OneDrive, and Microsoft Teams for enhanced reporting and protection.
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