Analytics BIOC
Low
✕
Exchange transport forwarding rule configured
A user configured an Exchange transport (mail flow) forwarding rule, which is applied to all emails that match certain conditions in the organization.
- Module:
- Identity Threat Detection (ITDR), SaaS Threat Detection, Email Security
- Licensed by:
- Identity Threat Detection (ITDR)
- Licensed by:
- Email Security
- Data source:
- Office 365 Audit
ATT&CK tactics: Collection (TA0009) Exfiltration (TA0010)
ATT&CK techniques: Email Collection: Email Forwarding Rule (T1114.003) Automated Exfiltration (T1020) Email Collection (T1114)
Attacker's goals:
Forward all emails in the organization that match specific criteria to an external recipient to collect sensitive information.
Investigative actions:
Check what mailboxes are affected by the transport rule. Look for signs that the user account and mailbox are compromised (e.g. abnormal logins, unusual activity). Check if the forwarding domain is an unknown external domain and look up its reputation. Investigate the IP address associated with the rule. Follow further actions done by the account. Check for a possible phishing campaign on the organization. Look for emails sent to this recipient by other users.
- Test period:
- N/A (single event)
- Deduplication:
- 1 Day
2 variations:
- Exchange transport forwarding rule configured by a delegate user Informational (parent: Low)
- Suspicious Exchange transport forwarding rule configured Medium (parent: Low)