Ensure notifications for internal users sending malware is Enabled

MoyenneNiveau 1Revue manuellem365

Description

Exchange Online Protection (EOP) is Microsoft's cloud-based filtering service that protects organizations against spam, malware, and other email threats. EOP is included in all Microsoft 365 organizations with Exchange Online mailboxes. EOP uses flexible anti-malware policies for malware protection settings. These policies can be set to notify Admins of malicious activity. This setting alerts administrators that an internal user sent a message that contained malware. This may indicate an account or machine compromise that would need to be investigated.

Méthode de vérification

Méthode d'audit: Revue manuelle

Cette recommandation ne peut pas être vérifiée automatiquement. Une analyse la liste avec ces instructions lorsque vous passez --include-manual.

To audit using the UI: 1. Navigate to Microsoft Defender https://security.microsoft.com. 2. Expand E-mail & Collaboration > Policies & rules. 3. On the Policies & rules page select Threat policies. 4. Under Policies select Anti-malware. 5. Click on the Default (Default) policy. 6. Verify that Notify an admin about undelivered messages from internal senders is set to On and that there is at least one email address under Administrator email address. To audit using PowerShell: 1. Connect to Exchange Online using Connect-ExchangeOnline. 2. Run the following command: Get-MalwareFilterPolicy | fl Identity, EnableInternalSenderAdminNotifications, InternalSenderAdminAddress 3. Verify that EnableInternalSenderAdminNotifications is set to True and a InternalSenderAdminAddress address is defined. Note: Audit and Remediation guidance may focus on the Default policy however, if a Custom Policy exists in the organization's tenant, then ensure the setting is set as outlined in the highest priority policy listed.

Méthode de correction

Méthode de correction: Recommandation ou correctif d'infrastructure

To remediate using the UI: 1. Navigate to Microsoft Defender https://security.microsoft.com. 2. Expand E-mail & Collaboration > Policies & rules. 3. On the Policies & rules page select Threat policies. 4. Under Policies select Anti-malware. 5. Click on the Default (Default) policy. 6. Click on Edit protection settings and change the settings for Notify an admin about undelivered messages from internal senders to On and enter the email address of the administrator who should be notified under Administrator email address. 7. Click Save. To remediate using PowerShell: 1. Connect to Exchange Online using Connect-ExchangeOnline. 2. Run the following command: Set-MalwareFilterPolicy -Identity '{Identity Name}' - EnableInternalSenderAdminNotifications $True -InternalSenderAdminAddress {admin@domain1.com} Note: Audit and Remediation guidance may focus on the Default policy however, if a Custom Policy exists in the organization's tenant, then ensure the setting is set as outlined in the highest priority policy listed.

Propriétés

Systèmes d'exploitation: Tous
Étiquettes: m365saas
Référence: CIS Microsoft 365 Foundations Benchmark v7.0.0 - 2.1.3 Ensure notifications for internal users sending malware is Enabled