Classification:

attack

Tactic:

TA0004-privilege-escalation

Technique:

T1078-valid-accounts

VIEW RULE IN DATADOG VIEW SIGNALS

Goal

Detect Google Cloud service account impersonation activity through the use of access tokens.

Strategy

Monitor Google Cloud Admin Activity audit logs for event @evt.name:GenerateAccessToken:

• Successful Attempts: @data.protoPayload.authorizationInfo.granted:true
• Failed Attempts: @evt.outcome:PERMISSION_DENIED

Triage & Response

1. Investigate if the user {{@usr.id}} from IP address:{{@network.client.ip}} intended to perform this activity.
2. If unauthorized:
   • Revoke access of compromised user and service account.
   • Investigate other activities performed by the user {{@usr.id}} using the Cloud SIEM - User Investigation dashboard.
   • Investigate other activities performed by the IP {{@network.client.ip}} using the Cloud SIEM - IP Investigation dashboard.