GCP IAM Service Account Key Deletion

Elastic Stack Serverless Security

Identifies the deletion of an Identity and Access Management (IAM) service account key in Google Cloud Platform (GCP). Each service account is associated with two sets of public/private RSA key pairs that are used to authenticate. If a key is deleted, the application will no longer be able to access Google Cloud resources using that key. A security best practice is to rotate your service account keys regularly.

Rule type: query

Rule indices:

• filebeat-*
• logs-gcp*

Severity: low

Risk score: 21

Runs every: 5m

Searches indices from: None (https://www.elastic.co/guide/en/elasticsearch/reference/current/common-options.html#date-math[Date Math format], see also Additional look-back time)

Maximum alerts per execution: 100

References:

• https://cloud.google.com/iam/docs/service-accounts
• https://cloud.google.com/iam/docs/creating-managing-service-account-keys

Tags:

• Elastic
• Cloud
• GCP
• Continuous Monitoring
• SecOps
• Identity and Access

Version: 6

Rule authors:

• Elastic

Rule license: Elastic License v2

The GCP Fleet integration, Filebeat module, or similarly structured data is required to be compatible with this rule.

event.dataset:(googlecloud.audit or gcp.audit) and event.action:google.iam.admin.v*.DeleteServiceAccountKey and event.outcome:success

Framework: MITRE ATT&CKTM

• Tactic:

  • Name: Persistence
  • ID: TA0003
  • Reference URL: https://attack.mitre.org/tactics/TA0003/

• Technique:

  • Name: Account Manipulation
  • ID: T1098
  • Reference URL: https://attack.mitre.org/techniques/T1098/