> 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/microsoft-teams-external-communication-policy-was-modified.md).

# Microsoft Teams external communication policy was modified

### Synopsis

| Field                | Value                                                                           |
| -------------------- | ------------------------------------------------------------------------------- |
| Activation Period    | 14 Days                                                                         |
| Training Period      | 30 Days                                                                         |
| Test Period          | N/A (single event)                                                              |
| Deduplication Period | 1 Day                                                                           |
| Required Data        | Office 365 Audit                                                                |
| Detection Modules    | Identity Threat Module, SaaS Threat Detection                                   |
| Detector Tags        | Microsoft Teams                                                                 |
| ATT\&CK Tactic       | Exfiltration (TA0010), Defense Impairment (TA0112)                              |
| ATT\&CK Technique    | Disable or Modify Tools (T1685), Exfiltration Over Alternative Protocol (T1048) |
| Severity             | Informational                                                                   |

### Description

Microsoft Teams external communication policy was modified.

### Attacker's Goals

Attackers may modify the external communication policy to enable data exfiltration or to hide their activities.

### Investigative actions

* Determine if it is within the user's role to modify the policy.
* Verify whether the modification of the policy is both legitimate and necessary.
* Follow further communication with the external tenant or allowed tenants.
* Correlate the event with its sign-in event to get additional information on the identity performing the action using the session ID.

### Variations

<details>

<summary>Microsoft Teams external communication policy was modified by an unusual user</summary>

**Synopsis**

| Field             | Value                                                                           |
| ----------------- | ------------------------------------------------------------------------------- |
| ATT\&CK Tactic    | Exfiltration (TA0010), Defense Impairment (TA0112)                              |
| ATT\&CK Technique | Disable or Modify Tools (T1685), Exfiltration Over Alternative Protocol (T1048) |
| Severity          | Low                                                                             |

**Description**

Microsoft Teams external communication policy was modified.

**Attacker's Goals**

Attackers may modify the external communication policy to enable data exfiltration or to hide their activities.

**Investigative actions**

* Determine if it is within the user's role to modify the policy.
* Verify whether the modification of the policy is both legitimate and necessary.
* Follow further communication with the external tenant or allowed tenants.
* Correlate the event with its sign-in event to get additional information on the identity performing the action using the session ID.

</details>


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