Techniques › T1537 › AN1581
AN1581 Analytic 1581
Office Suite · attack.mitre.org · ATT&CK Enterprise v19.2
<p>Detects user activity that shares or syncs files with external domains via link generation, OneDrive external sharing, or file transfer actions involving non-whitelisted partner tenants.</p>
- Detects
- T1537 Transfer Data to Cloud Account
- Part of
- DET0573 Cross-Platform Detection of Data Transfer to Cloud Account
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 | SharingSet | DC0023 Cloud Storage Modification |
| m365:unified | AnonymousLinkCreated | DC0027 Cloud Storage Metadata |
| m365:unified | FileAccessed | DC0038 Application Log Content |
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 |
|---|---|
ExternalDomainList | Known partner or adversarial cloud identities/domains |
TimeWindow | Duration between file access and external sharing |
SharingMethod | Type of link (anonymous, internal, organization-wide) to alert on |