Ensure comprehensive attachment filtering is applied
Why This Matters
Blocking known and custom malicious file types from email attachments is a critical defense against malware infections, phishing attacks, and data extraction attempts. Many legacy file formats and compressed files have been used as delivery mechanisms for malicious software. By implementing a comprehensive attachment filter, you protect your organization from Business Email Compromise (BEC) attacks and reduce the risk of endpoint compromises.
What Aether365 Checks
This check verifies that the Common Attachment Types Filter in Microsoft 365 is configured to block a comprehensive list of file extensions, including the default 53 Microsoft-provided extensions plus an additional custom list of 187 extensions. The results appear in your Aether365 dashboard under the microsoft-365 checks section.