ORCA.111: Anti-phishing policy exists and EnableUnauthenticatedSender is true.
| ID | ORCA.111 |
| Severity | Medium |
| Suite | ORCA |
| Product | Defender |
| Related products | Exchange Online |
| Feature | Anti-phishing |
| Security area | Email and collaboration protection |
| Resource type | Policy |
| User impact of fixing | Low |
| Effort to fix | Low |
| Framework controls | nist-800-53-r5:SI-8 Spam Protection |
| MITRE ATT&CK | T1566, T1684.002 |
| Reads from | Exchange Online |
| Licence needed | ATP_ENTERPRISE |
What this checks and how to fix it
Section titled “What this checks and how to fix it”When the sender email address is spoofed, the message appears to originate from someone or somewhere other than the actual source. It is recommended to enable unauthenticated sender tagging in Office 365 Anti-phishing policies. The feature apply a ‘?’ symbol in Outlook’s sender card if the sender fails authentication checks.
Remediation action
Section titled “Remediation action”Enable unauthenticated sender tagging in Anti-phishing policy.
Related Links
Section titled “Related Links”- Microsoft 365 Defender Portal - Anti-phishing
- Recommended settings for EOP and Office 365 Microsoft Defender for Office 365 security
- Unverified Sender
Mito check, based on ORCA. Author: soulemike. Open-source licences.
Open-source licences. CIS Benchmark material © Center for Internet Security, Inc.; CISA SCuBA baselines are public domain (CC0).
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