First SSO access from ASN for user

Synopsis

Field	Value
Activation Period	14 Days
Training Period	30 Days
Test Period	N/A (single event)
Deduplication Period	1 Day
Required Data	Requires one of the following data sources: AzureAD OR Azure SignIn Log OR Idira OR Duo OR Google Workspace Authentication OR Okta OR OneLogin OR PingOne
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 a new ASN.

Attacker's Goals

Use an account that was possibly compromised to gain access to the network.

Investigative actions

• Confirm that the activity is benign (e.g. the user has switched locations and providers).
• Verify if the ASN is an approved ASN to authenticate from.
• Follow further actions done by the user.

Variations

First SSO access from ASN for user - suspicious characteristics detected

Synopsis

Field	Value
ATT&CK Tactic	Initial Access (TA0001)
ATT&CK Technique	Valid Accounts: Domain Accounts (T1078.002)
Severity	Low

Description

First SSO access from ASN for user that shows suspicious characteristics.

Attacker's Goals

Use an account that was possibly compromised to gain access to the network.

Investigative actions

• Confirm that the activity is benign (e.g. the user has switched locations and providers).
• Verify if the ASN is an approved ASN to authenticate from.
• Follow further actions done by the user.

Google Workspace - First SSO access from ASN for user

Synopsis

Field	Value
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 a new ASN.

Attacker's Goals

Use an account that was possibly compromised to gain access to the network.

Investigative actions

• Confirm that the activity is benign (e.g. the user has switched locations and providers).
• Verify if the ASN is an approved ASN to authenticate from.
• Follow further actions done by the user.