T1069.003Not expressible in Sigma

Cloud Groups

DiscoverySaaS, IaaS, Office Suite, Identity Provider

Where this stands

No Sigma rule can address this — the telemetry MITRE names has no Sigma logsource behind it.

None of MITRE's analytics for this technique name a log source that maps to a Sigma logsource — they describe abstract data ("Process::None"), API-hook telemetry, or prose channels with no reliable field names behind them.

What the technique is

Adversaries may attempt to find cloud groups and permission settings. The knowledge of cloud permission groups can help adversaries determine the particular roles of users and groups within an environment, as well as which users are associated with a particular group. With authenticated access there are several tools that can be used to find permissions groups. The Get-MsolRole PowerShell cmdlet can be used to obtain roles and permissions groups for Exchange and Office 365 accounts. Azure CLI (AZ CLI) and the Google Cloud Identity Provider API also provide interfaces to obtain permissions groups. The command az ad user get-member-groups will list groups associated to a user account for Azure while the API endpoint GET https://cloudidentity.googleapis.com/v1/groups lists group resources available to a user for Google. In AWS, the commands ListRolePolicies and ListAttachedRolePolicies allow users to enumerate the policies attached to a role. Adversaries may attempt to list ACLs for objects to determine the owner and other accounts with access to the object, for example, via the AWS GetBucketAcl API. Using this information an adversary can target accounts with permissions to a given object or leverage accounts they have already compromised to access the object.

Read it on attack.mitre.org

What MITRE says you would watch

AN0695
Detects adversarial use of cloud-native APIs (e.g., AWS IAM, Azure RBAC, GCP Identity) to enumerate cloud group memberships or policy mappings via unauthorized sessions or scripts.
AN0696
Identifies unauthorized access or enumeration of administrative roles, security groups, or distribution groups via Exchange/SharePoint/Teams APIs or role discovery scripts.
AN0697
Monitors API calls and service-specific logs for enumeration of organizational roles, permissions, and group structure, particularly outside of normal admin behavior baselines.