> 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/massive-files-deletion-in-microsoft-sharepoint-or-onedrive.md).

# Massive files deletion in Microsoft SharePoint or OneDrive

### Synopsis

| Field                | Value                     |
| -------------------- | ------------------------- |
| Activation Period    | 14 Days                   |
| Training Period      | 30 Days                   |
| Test Period          | 1 Hour                    |
| Deduplication Period | 1 Day                     |
| Required Data        | Office 365 Audit          |
| Detection Modules    | Identity Threat Module    |
| Detector Tags        | Data Detection & Response |
| ATT\&CK Tactic       | Impact (TA0040)           |
| ATT\&CK Technique    | Data Destruction (T1485)  |
| Severity             | Informational             |

### Description

A user deleted a large amount of data in Microsoft SharePoint or OneDrive. This behavior may indicate that the data is being wiped.

### Attacker's Goals

An attacker may delete files from a SaaS service to wipe data from the organization.

### Investigative actions

* Investigate the source account and verify if it was compromised or performed an authorized activity.
* Review the files that were deleted to determine if they contain sensitive or critical data.
* Monitor the account for any further suspicious actions.

### Variations

<details>

<summary>Massive files deletion in Microsoft SharePoint or OneDrive with suspicious parameters</summary>

**Synopsis**

| Field             | Value                    |
| ----------------- | ------------------------ |
| ATT\&CK Tactic    | Impact (TA0040)          |
| ATT\&CK Technique | Data Destruction (T1485) |
| Severity          | Low                      |

**Description**

A suspicious user deleted a large amount of data in Microsoft SharePoint or OneDrive. This behavior may indicate that the data is being wiped.

**Attacker's Goals**

An attacker may delete files from a SaaS service to wipe data from the organization.

**Investigative actions**

* Investigate the source account and verify if it was compromised or performed an authorized activity.
* Review the files that were deleted to determine if they contain sensitive or critical data.
* Monitor the account for any further suspicious actions.

</details>


---

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