Those emails with attachments that are deemed malicious are stopped from being delivered to users. This is sort of a “-whatif” parameter used in PowerShell.īlock: This is an aggressive approach and should be used only if you are confident that all valid users have been allowed in the tenant. This approach is especially useful when you just want to see how ATP will behave in your organization. You can always view the reports (discussed below) to decide whether enabling this will cause any major disruption. Enabling it ensures that none of the emails are blocked or modified in production environment instead they are merely recorded as either safe or malicious. Monitor: I have effectively used this to analyze the impact of enabling safe attachments. Off: ATP Safe Attachments is switched off. There are multiple options to choose from, as follows: New Safe Attachments Policy Safe Attachments unknown malware response You can choose to edit the default policy or create a new policy. Exchange Online Protection scans all the attachments in emails however, it is critical to have ATP Safe Attachments as another layer of safety. ATP safe attachments ^Įmails may contain suspicious or malicious attachments. If you wish to adopt an aggressive approach, this setting needs to be checked.ĭo not rewrite the following URLs: There may be some URLs that you want to allow in your tenant add these URLs to this section. ![]() I recommend you select this option.ĭo not track when users click safe links: You should keep this option unchecked so that you can track the malicious URLs clicked by users.ĭo not let users click through safe links to original URL : When users click malicious links, they are presented with a warning and are given the option to access the site or to avoid it. This may sometimes lead to slight delays in email delivery hence, it's recommended to keep this one unchecked.Īpply safe links to email messages sent within the organization: Safeguard your users from malicious links included in emails exchanged among internal users. Wait for URL scanning to complete before delivering the message: If selected, emails are delivered after the URLs in them are scanned. ![]() It ensures that the URLs are detonated in a sandbox environment to be analyzed. Again, the URLs shall be compared with the list Microsoft has for malicious ones from all over the tenants in Office 365.Īpply real-time URL scanning for suspicious links and links that point to files: I would strongly recommend to select this option. Select the action for unknown potentially malicious URLs within Microsoft Teams: Enabling this will extend the protection of ATP over to Microsoft Teams as well. This ensures that your environment is protected against all these known URLs. Select the action for unknown potentially malicious URLs in messages: Microsoft has a list of malicious links accumulated using machine learning algorithms from all the tenants in Microsoft 365. Safe Links policies that apply to specific users The next section in the default policy is Settings that apply to content except email. You can expect this section to be filled over a period of time as you keep noticing and adding suspicious URLs to the tenant. ![]() The default policy allows you to add the URLs that you want to block for your tenant. It can be a bit confusing, since you would see the default policy and then another section where you can configure policies for specific users. The first section is the default policy, which applies to everyone. There are two sections in the Safe Links policies. This approach is also called "real-time scanning." We will cover the policies in the next section. Then, when the user clicks the URL in the email, ATP starts scanning it to decide whether it's malicious. ATP launches the URL in a sandbox environment, scans it, and then delivers it to the user if it's safe.Depending on the policy you configure, ATP will come into the picture in one of two ways: Safe Links options ^Īll the emails received by users are scanned by Exchange Online Protection (EOP) in Microsoft 365. If you want the URLs in emails to be scanned, and if you wish to analyze the malicious URLs that were delivered and clicked on, then Safe Links will have you covered. Safe Links shields your tenant from malicious URLs in emails and Office documents.
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