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# 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 |
| Detector Tags | Microsoft Teams |
| ATT\&CK Tactic | Defense Evasion (TA0005), Exfiltration (TA0010) |
| ATT\&CK Technique | Impair Defenses (T1562), 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
Microsoft Teams external communication policy was modified by an unusual user
**Synopsis**
| Field | Value |
| ----------------- | ----------------------------------------------------------------------- |
| ATT\&CK Tactic | Defense Evasion (TA0005), Exfiltration (TA0010) |
| ATT\&CK Technique | Impair Defenses (T1562), 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.
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