> For the complete documentation index, see [llms.txt](https://cortex-docs.paloaltonetworks.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://cortex-docs.paloaltonetworks.com/analytics-alerts/alerts-by-name/unusual-access-to-microsoft-365-storage-services.md).
# Unusual access to Microsoft 365 storage services
### Synopsis
| Field | Value |
| -------------------- | --------------------------------------------------------------------------------------------- |
| Activation Period | 14 Days |
| Training Period | 30 Days |
| Test Period | N/A (single event) |
| Deduplication Period | 5 Days |
| Required Data | Requires one of the following data sources:
Azure Audit Log OR Microsoft Graph Logs
|
| Detection Modules | Cloud |
| Detector Tags | Microsoft Graph Activity Logs |
| ATT\&CK Tactic | Discovery (TA0007) |
| ATT\&CK Technique | Cloud Service Discovery (T1526) |
| Severity | Informational |
### Description
Unusual access was detected to a Microsoft 365 storage service.
### Attacker's Goals
Extract sensitive information stored in Microsoft 365 storage services.
### Investigative actions
* Determine which items were accessed.
* Identify whether they contained any sensitive information.
* Check for signs of a compromised identity, such as abnormal login activity or unusual behavior.
* Verify if the identity is authorized to access these drives.
* Monitor the identity for any further suspicious actions.
### Variations
Unusual access to Microsoft 365 storage services from an uncommon IP
**Synopsis**
| Field | Value |
| ----------------- | ------------------------------- |
| ATT\&CK Tactic | Discovery (TA0007) |
| ATT\&CK Technique | Cloud Service Discovery (T1526) |
| Severity | Low |
**Description**
Unusual access was detected to a Microsoft 365 storage service.
**Attacker's Goals**
Extract sensitive information stored in Microsoft 365 storage services.
**Investigative actions**
* Determine which items were accessed.
* Identify whether they contained any sensitive information.
* Check for signs of a compromised identity, such as abnormal login activity or unusual behavior.
* Verify if the identity is authorized to access these drives.
* Monitor the identity for any further suspicious actions.
---
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