VirusTotal inspects items with over 70 antivirus scanners and URL/domain blacklisting services, in addition to a myriad of tools to extract signals from the studied content. Any user can select a file from their computer using their browser and send it to VirusTotal. VirusTotal offers a number of file submission methods, including the primary public web interface, desktop uploaders, browser extensions and a programmatic API. The web interface has the highest scanning priority among the publicly available submission methods. Submissions may be scripted in any programming language using the HTTP-based public API.

As with files, URLs can be submitted via several different means including the VirusTotal webpage, browser extensions and the API.

Upon submitting a file or URL basic results are shared with the submitter, and also between the examining partners, who use results to improve their own systems. As a result, by submitting files, URLs, domains, etc. to VirusTotal you are contributing to raise the global IT security level.

This core analysis is also the basis for several other features, including the VirusTotal Community: a network that allows users to comment on files and URLs and share notes with each other. VirusTotal can be useful in detecting malicious content and also in identifying false positives -- normal and harmless items detected as malicious by one or more scanners.

Link: https://www.virustotal.com/#/home/upload

Malware signatures are updated frequently by VirusTotal as they are distributed by antivirus companies, this ensures that our service uses the latest signature sets.

Website scanning is done in some cases by querying vendor databases that have been shared with VirusTotal and stored on our premises, and in other cases by API queries to an antivirus company's solution. As such, as soon as a given contributor blacklists a URL it is immediately reflected in user-facing verdicts.

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