Adversaries may attempt to get a listing of cloud accounts. Cloud accounts are those created and configured by an organization for use by users, remote support, services, or for administration of resources within a cloud service provider or SaaS application.
With authenticated access there are several tools that can be used to find accounts. The
Get-MsolRoleMember PowerShell cmdlet can be used to obtain account names given a role or permissions group in Office 365. The Azure CLI (AZ CLI) also provides an interface to obtain user accounts with authenticated access to a domain. The command
az ad user list will list all users within a domain.
The AWS command
aws iam list-users may be used to obtain a list of users in the current account while
aws iam list-roles can obtain IAM roles that have a specified path prefix. In GCP,
gcloud iam service-accounts list and
gcloud projects get-iam-policy may be used to obtain a listing of service accounts and users in a project.
Routinely check user permissions to ensure only the expected users have the ability to list IAM identities or otherwise discover cloud accounts.
|M1018||User Account Management||
Limit permissions to discover cloud accounts in accordance with least privilege. Organizations should limit the number of users within the organization with an IAM role that has administrative privileges, strive to reduce all permanent privileged role assignments, and conduct periodic entitlement reviews on IAM users, roles and policies.
|ID||Data Source||Data Component|
|DS0002||User Account||User Account Metadata|
Monitor processes, command-line arguments, and logs for actions that could be taken to gather information about cloud accounts, including the use of calls to cloud APIs that perform account discovery.
System and network discovery techniques normally occur throughout an operation as an adversary learns the environment, and also to an extent in normal network operations. Therefore discovery data and events should not be viewed in isolation, but as part of a chain of behavior that could lead to other activities, such as Lateral Movement, based on the information obtained.