> 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/user-installed-an-application-in-microsoft-teams-via-graph-api.md).

# User installed an application in Microsoft Teams via Graph API

### Synopsis

| Field                | Value                                 |
| -------------------- | ------------------------------------- |
| Activation Period    | 14 Days                               |
| Training Period      | 30 Days                               |
| Test Period          | N/A (single event)                    |
| Deduplication Period | 1 Day                                 |
| Required Data        | Microsoft Graph Logs                  |
| Detection Modules    | Identity Threat Module                |
| Detector Tags        | Microsoft Teams                       |
| ATT\&CK Tactic       | Persistence (TA0003)                  |
| ATT\&CK Technique    | Cloud Application Integration (T1671) |
| Severity             | Informational                         |

### Description

A user who rarely uses the Graph API to install Microsoft Teams applications has installed one using it.

### Attacker's Goals

Attackers may leverage Teams applications to maintain persistent access to compromised Teams accounts.

### Investigative actions

* Verify the user's role and typical usage of Microsoft Graph API.
* Check if the user's account has recently logged in from unusual locations or devices.
* Review recent email and chat activity to identify any phishing or suspicious messages sent.
* Examine the Graph API call logs to see what actions were performed and their timestamps.
* Correlate with endpoint logs to detect any malware or suspicious processes running on the user's device.
* Check for signs of account compromise, such as password changes or MFA bypass attempts.
* Follow further actions done by the account.

### Variations

<details>

<summary>User installed an application in Microsoft Teams via Graph API from a first seen ASN</summary>

**Synopsis**

| Field             | Value                                 |
| ----------------- | ------------------------------------- |
| ATT\&CK Tactic    | Persistence (TA0003)                  |
| ATT\&CK Technique | Cloud Application Integration (T1671) |
| Severity          | Low                                   |

**Description**

A user who rarely uses the Graph API to install Microsoft Teams applications has installed one using it.

**Attacker's Goals**

Attackers may leverage Teams applications to maintain persistent access to compromised Teams accounts.

**Investigative actions**

* Verify the user's role and typical usage of Microsoft Graph API.
* Check if the user's account has recently logged in from unusual locations or devices.
* Review recent email and chat activity to identify any phishing or suspicious messages sent.
* Examine the Graph API call logs to see what actions were performed and their timestamps.
* Correlate with endpoint logs to detect any malware or suspicious processes running on the user's device.
* Check for signs of account compromise, such as password changes or MFA bypass attempts.
* Follow further actions done by the account.

</details>


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