Analytics BIOC
Informational
✕
Unusual sender IP subnet
This IP address has not been observed in correlation with the sender's fully qualified domain name within the last 30 days.
- 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:
Disguise the email's origin by spoofing the received header to appear as a trusted sender, impersonating a trusted source, aims to mislead recipients into disclosing private data or performing unsafe acts.
Investigative actions:
Review the email's received headers, to trace its path and spot spoofing signs. Examine the sender's IP address and domain reputation. Closely inspect the email content for malicious links, attachments, or requests for sensitive information. 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:
- Unusual sender IP subnet associated with infrastructure or tunneling services Informational
- Unusual sender IP subnet associated with internal sender Informational