Suspicious Anonymous Sharing Link Creation in SharePoint or OneDrive via M365 Audit

ATT&CK techniques

Initial Access → Cred Access

Recon
Resource Dev
Initial Access
- T1566.002Spearphishing Link
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
- T1539Steal Web Session Cookie
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects creation of anonymous or secure sharing links in SharePoint and OneDrive, an abuse pattern in which attackers host phishing lures on trusted file services and share them broadly to steal identities. Adversary-in-the-middle campaigns use restricted-access links to evade automated scanning while harvesting session cookies from victims.

Reporting behind it

Related detections9 linkedT1539 — drag to rearrange

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Suspicious Anonymous Sharing Link Creation in SharePoint or OneDrive via M365 Audit

Pivot detection · T1539 · 9 related

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.

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