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Last week, we mentioned that as part of a Sophos Cloud public beta. The beta also introduces a new next-generation endpoint protection feature called download reputation.

While it may not sound flashy, download reputation is an important step forward in protecting users from advanced threats, like zero-day malware designed to evade traditional antivirus defenses.

crowdsources threat intelligence by drawing on the experience of our global customer base to help determine a file’s reputation. In other words, every user with download reputation enabled helps contribute to the collective security of our customers.

Let’s take a look at how download reputation works.

When a user tries to from a supported web browser, download reputation asks SophosLabs for information about the file. If the file is known to be malicious, it will, of course, be blocked. If the file is not known to be malicious but has a low reputation — or no reputation at all — the user will be prompted and asked whether to block or allow the file.

So how do we determine a file’s reputation? SophosLabs looks at a combination of a file’s prevalence (how common it is), its age (older files are less likely to be unidentified threats), and the URL from which the file was downloaded. Layered atop this objective information is an important subjective measure: of the users who have been prompted about the file, how many of them blocked it and how many allowed it? If most users allowed the file, it might indicate that this is a legitimate download from a reputable source. If many users blocked the download, perhaps it indicates that users were feeling pressured or deceived into saving the file.

This crowdsourced approach to download reputation protects customers from advanced threats in two important ways. First, it closes the gap between known or suspected malware, which we can block with confidence, and known safe files, which we feel confident allowing to run. Second, it gives SophosLabs early warning if a new threat has emerged that is currently evading detection. This gives the Labs a chance to analyze the file further and develop new detection capabilities if needed.

Try download reputation in Sophos Cloud

Would you like to join of download reputation and application control? If you’re an existing Sophos Cloud customer, just select “Beta Programs” from the “Account” drop-down menu in the Cloud console.

Not yet a customer? , and you can join the beta as described above. If you’re using our on-premise Endpoint Protection, download reputation is expected to make its way to Sophos Enterprise Console later this year.

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