SSO with abnormal operating system

Synopsis

Field	Value
Activation Period	14 Days
Training Period	30 Days
Test Period	N/A (single event)
Deduplication Period	1 Day
Required Data	Requires all of the following: AzureAD OR Okta OneLogin
Detection Modules	Identity Analytics
ATT&CK Tactic	Initial Access (TA0001)
ATT&CK Technique	Valid Accounts: Domain Accounts (T1078.002)
Severity	Informational

Description

A user successfully authenticated via SSO with an abnormal operating system.

Attacker's Goals

Use a legitimate user and authenticate via an SSO service to gain access to the network.

Investigative actions

• Confirm that the activity is benign (e.g. the user has really moved to a new operating system).
• Follow actions and suspicious activities regarding the user.