Techniques › T1137.005 › AN0264
AN0264 Analytic 0264
Office Suite · attack.mitre.org · ATT&CK Enterprise v19.2
<p>Adversary adds a new Outlook rule with modified or obfuscated PR_RULE_MSG_NAME and PR_RULE_MSG_PROVIDER attributes using MFCMapi or Ruler. Rule is triggered when email arrives, executing embedded or external code. Mailbox audit logs or Unified Audit Log shows automated rule-triggered action without user interaction.</p>
- Detects
- T1137.005 Outlook Rules
- Part of
- DET0095 Detect Persistence via Malicious Outlook Rules
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 |
|---|---|---|
| m365:unified | Creation or modification of inbox rule outside of normal user behavior | DC0038 Application Log Content |
| m365:messagetrace | Inbound email matches crafted rule trigger pattern tied to persistence logic | DC0064 Command Execution |
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 |
|---|---|
AuditPolicyScope | Mailbox rule changes may not be captured unless advanced audit logging is enabled |
RuleProviderName | Malicious rules may use spoofed or non-standard PR_RULE_MSG_PROVIDER values |
TriggerSubjectKeywords | Triggering emails may contain uncommon but benign-looking subjects |
UserContext | Target user account may be inactive or high-value (e.g., VIP, service account) |