Successful unusual guest user invitation

Synopsis

Field	Value
Activation Period	14 Days
Training Period	30 Days
Test Period	N/A (single event)
Deduplication Period	1 Day
Required Data	AzureAD Audit Log
Detection Modules	Identity Threat Module, SaaS Threat Detection
ATT&CK Tactic	Persistence (TA0003)
ATT&CK Technique	Valid Accounts (T1078)
Severity	Informational

Description

An identity successfully invited a guest user to the tenant with unusual characteristics.

Attacker's Goals

An attacker can invite users to for evasion.

Investigative actions

• Check who is the invited guest user.
• Check whether the inviter is permitted to perform such actions.
• Check if the domain of the invited guest is allowed for invitations in the organization.

Variations

Rare successful guest invitation in the organization

Synopsis

Field	Value
ATT&CK Tactic	Persistence (TA0003)
ATT&CK Technique	Valid Accounts (T1078)
Severity	Low

Description

An identity successfully invited a suspicious guest user to the tenant.

Attacker's Goals

An attacker can invite users to for evasion.

Investigative actions

• Check who is the invited guest user.
• Check whether the inviter is permitted to perform such actions.
• Check if the domain of the invited guest is allowed for invitations in the organization.