Analytics BIOC Informational
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Suspicious SPF Result

The email has a suspicious SPF result of fail, soft fail, or policy, which may indicate a potential domain misconfiguration or spoofing.

Module:
Email Security
Licensed by:
Email Security
Data source:
Microsoft 365 Emails
ATT&CK tactics: Defense Evasion (TA0005)
ATT&CK techniques: Impersonation (T1656)
Detector tags: Spoofing
Attacker's goals:

Impersonate internal users or familiar individuals. Trick users into clicking on malicious links or attachments.

Investigative actions:

Check the email address for any unusual spellings. Check the email address for any missing letters. Verify the sender's domain to confirm its legitimacy. Examine the sender's IP address and reputation. Verify the domain's connection to the IP address and investigate the reason SPF didn't pass. Verify whether the sender's IP address has appeared in different log sources before. Verify if the sender's IP address is identifiable. If the message contains attachments or links, scrutinize them for any suspicious indications. Monitor further actions taken, such as file downloads or access to potentially malicious links.

Test period:
N/A (single event)
Deduplication:
1 Day
2 variations:
  • Internal domain SPF deviation Informational
  • Known domain SPF deviation Informational