A Microsoft Teams application was installed

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	Persistence (TA0003)
ATT&CK Technique	Cloud Application Integration (T1671)
Severity	Informational

Description

A Microsoft Teams application was installed.

Attacker's Goals

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

Investigative actions

• Confirm that the application was created by a certified and trusted entity.
• Evaluate the permissions requested by the application to determine if they are excessive or unusual.
• Determine if it is within the user's role to install this type of application.
• Correlate the alert with the sign-in event to get additional information on the identity performing the action.
• Follow further actions done by the account.

Variations

A Microsoft Teams application was installed with special parameters

Synopsis

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

Description

A Microsoft Teams application was installed.

Attacker's Goals

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

Investigative actions

• Confirm that the application was created by a certified and trusted entity.
• Evaluate the permissions requested by the application to determine if they are excessive or unusual.
• Determine if it is within the user's role to install this type of application.
• Correlate the alert with the sign-in event to get additional information on the identity performing the action.
• Follow further actions done by the account.