Suspicious SSO access from ASN

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 suspicious SSO authentication was made by a user.

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

Suspicious SSO access from ASN via a suspicious IP

Synopsis

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

Description

A suspicious SSO authentication was made by a user.

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 - Suspicious SSO access from ASN

Synopsis

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

Description

A suspicious SSO authentication was made by a user.

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.