Microsoft 365
TMA-M365-2.1.7
Ensure that an anti-phishing policy has been created
Descrição
By default, Office 365 includes built-in features that help protect users from phishing attacks. Set up anti-phishing polices to increase this protection, for example by refining settings to better detect and prevent impersonation and spoofing attacks. The default policy applies to all users within the organization and is a single view to fine-tune anti- phishing protection. Custom policies can be created and configured for specific users, groups or domains within the organization and will take precedence over the default policy for the scoped users. Protects users from phishing attacks (like impersonation and spoofing) and uses safety tips to warn users about potentially harmful messages.
Como é verificado
Método de auditoria: Revisão manual
To audit using the UI: 1. Navigate to Microsoft Defender https://security.microsoft.com. 2. Expand Email & collaboration > Policies & rules 3. Select Threat policies. 4. Under Policies select Anti-phishing. 5. Verify an AntiPhish policy exists that is On and meets the following criteria: 6. Under Users, groups, and domains o Verify that the included domains and groups includes a majority of the organization. 7. Under Phishing threshold & protection verify the following: o Phishing email threshold is at least 3 - More Aggressive. o User impersonation protection is On and contains a subset of users. o Domain impersonation protection is On for owned domains. o Mailbox intelligence and Mailbox intelligence for impersonations and Spoof intelligence are On. 8. Under Actions verify the following: o If a message is detected as user impersonation is set to Quarantine the message. o If a message is detected as domain impersonation is set to Quarantine the message. o If Mailbox Intelligence detects an impersonated user is set to Quarantine the message. o First contact safety tip is On. o User impersonation safety tip is On. o Domain impersonation safety tip is On. o Unusual characters safe...
Como é corrigido
Método de correção: Orientação ou patch de infraestrutura
To remediate using the UI: 1. Navigate to Microsoft Defender https://security.microsoft.com. 2. Expand Email & collaboration > Policies & rules 3. Select Threat policies. 4. Under Policies select Anti-phishing and click Create. 5. Name the policy, continuing and clicking Next as needed: o Add Groups and/or Domains that contain a majority of the organization. o Set Phishing email threshold to 3 - More Aggressive o Check Enable users to protect and add up to 350 users o Check Enable domains to protect and check Include domains I own o Check Enable mailbox intelligence (Recommended) o Check Enable Intelligence for impersonation protection (Recommended) o Check Enable spoof intelligence (Recommended) 6. Under Actions configure the following: o Set If a message is detected as user impersonation to Quarantine the message o Set If a message is detected as domain impersonation to Quarantine the message o Set If Mailbox Intelligence detects an impersonated user to Quarantine the message o Leave Honor DMARC record policy when the message is detected as spoof checked. o Check Show first contact safety tip (Recommended) o Check Show user impersonation safety tip o Check Show domain imperson...
Propriedades
- Sistemas operacionais
- Qualquer
- Tags
- m365saas
- Referência
- CIS Microsoft 365 Foundations Benchmark v7.0.0 - 2.1.7 Ensure that an anti-phishing policy has been created