Techniques › T1137.004 › AN0503
AN0503 Analytic 0503
Office Suite · attack.mitre.org · ATT&CK Enterprise v19.2
<p>Malicious HTML or script is rendered as a Home Page for a specific Outlook folder. Outlook accesses that folder, loads remote content, and executes embedded JavaScript or ActiveX/COM logic resulting in unauthorized actions or local execution.</p>
- Detects
- T1137.004 Outlook Home Page
- Part of
- DET0177 Detect Persistence via Outlook Home Page Exploitation
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 | Folder configuration updated with external or HTML-formatted Home Page via Set-MailboxFolder | DC0038 Application Log Content |
| m365:messagetrace | Inbound email triggering Outlook to auto-access folder tied to malicious Home Page | 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 | Home Page customization may not be audited unless detailed message or folder auditing is enabled |
FolderAccessRate | Anomalous access to folders not usually interacted with can signal triggering of malicious view |
ExternalURLAllowlist | Mail clients may restrict remote Home Page content unless domain is explicitly allowed |