Techniques › T1087.003 › AN0642
AN0642 Analytic 0642
Office Suite · attack.mitre.org · ATT&CK Enterprise v19.2
<p>Suspicious querying of organization-wide directory data via Google Workspace Directory API or Outlook GAL sync in high volume from abnormal users, service accounts, or unknown device contexts.</p>
- Detects
- T1087.003 Email Account
- Part of
- DET0229 Enumeration of Global Address Lists via Email Account Discovery
Log sources and channels
Exactly as MITRE states them in x_mitre_log_source_references. Where a channel is vague, it is vague in the source; kevmap does not tidy it.
| Log source | Channel | Data component |
|---|---|---|
| gcp:audit | Directory API Access: users.list or groups.list | DC0013 User Account Metadata |
| m365:unified | GAL Lookup or Address Book download | DC0038 Application Log Content |
| azure:signinlogs | Unusual Token Usage or Application Consent | DC0002 User Account Authentication |
Mutable elements
Parameters MITRE marks as environment-specific. These are the knobs you are expected to tune; they are why an analytic is not a rule.
| Field | Description |
|---|---|
APIQueryVolume | Set thresholds for excessive use of 'users.list' or recursive group enumerations. |
UserContext | Flag non-admin or previously unseen user agents requesting directory information. |
AppSource | Distinguish between sanctioned sync tools and unauthorized scripts or OAuth tokens. |