Synopsis
Activation Period |
14 Days |
Training Period |
30 Days |
Test Period |
N/A (single event) |
Deduplication Period |
1 Day |
Required Data |
|
Detection Modules |
Identity Threat Module |
Detector Tags |
|
ATT&CK Tactic |
|
ATT&CK Technique |
|
Severity |
Informational |
Description
A user configured an Exchange inbox rule that may be used to hide emails.
Attacker's Goals
Prevent an organization from warning users that they've been compromised (e.g. an internal spear-phishing campaign).
Investigative actions
- Look for signs that the user account and mailbox are compromised (e.g. abnormal logins, unusual activity).
- Check if the rule keywords look suspicious.
- 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 multiple instances of email hiding, which may be an indication of a larger campaign.
- Check if the user regularly configures inbox rules.