M365 Teams Custom Application Interaction Enabled

Last updated 22 days ago on 2025-12-10

Created 5 years ago on 2020-11-30

About

Identifies when custom applications are allowed in Microsoft Teams. If an organization requires applications other than those available in the Teams app store, custom applications can be developed as packages and uploaded. An adversary may abuse this behavior to establish persistence in an environment.

Tags

Domain: CloudData Source: Microsoft 365Use Case: Configuration AuditTactic: Defense EvasionLanguage: kuery

Severity

medium

Risk Score

MITRE ATT&CK™

Defense Evasion (TA0005)(external, opens in a new tab or window)

↳ Impair Defenses (T1562)(external, opens in a new tab or window)

False Positive Examples

Custom applications may be allowed by a system or network administrator. Verify that the configuration change was expected. Exceptions can be added to this rule to filter expected behavior.

License

Elastic License v2(external, opens in a new tab or window)

Definition

Rule Type: Query (Kibana Query Language)
Integration Pack: Prebuilt Security Detection Rules
Index Patterns: logs-o365.audit-*filebeat-*
Related Integrations: o365(external, opens in a new tab or window)
Query

✄𐘗text code block:
✄𐘗event.dataset:o365.audit and event.provider:MicrosoftTeams and
event.category:web and event.action:TeamsTenantSettingChanged and
o365.audit.Name:"Allow sideloading and interaction of custom apps" and
o365.audit.NewValue:True and event.outcome:success

Install detection rules in Elastic Security

Detect M365 Teams Custom Application Interaction Enabled in the Elastic Security detection engine by installing this rule into your Elastic Stack.

To setup this rule, check out the installation guide for Prebuilt Security Detection Rules(external, opens in a new tab or window).