Possible Consent Grant Attack via Azure-Registered Application

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Possible Consent Grant Attack via Azure-Registered Application

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Identifies when a user grants permissions to an Azure-registered application or when an administrator grants tenant-wide permissions to an application. An adversary may create an Azure-registered application that requests access to data such as contact information, email, or documents.

Rule type: query

Rule indices:

  • filebeat-*

Severity: medium

Risk score: 47

Runs every: 5 minutes

Searches indices from: now-25m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

Tags:

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

Version: 1

Added (Elastic Stack release): 7.10.0

Rule authors: Elastic

Rule license: Elastic License

Investigation guide

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  • The Azure Filebeat module must be enabled to use this rule.
  • In a consent grant attack, an attacker tricks an end user into granting a malicious application consent to access their data, usually via a phishing attack. After the malicious application has been granted consent, it has account-level access to data without the need for an organizational account.
  • Normal remediation steps, like resetting passwords for breached accounts or requiring Multi-Factor Authentication (MFA) on accounts, are not effective against this type of attack, since these are third-party applications and are external to the organization.
  • Security analysts should review the list of trusted applications for any suspicious items.

Rule query

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event.dataset:(azure.activitylogs or azure.auditlogs) and (
azure.activitylogs.operation_name:"Consent to application" or
azure.auditlogs.operation_name:"Consent to application" ) and
event.outcome:success

Threat mapping

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Framework: MITRE ATT&CKTM