Cloud Groups

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 <code>Get-MsolRole</code> PowerShell cmdlet can be used to obtain roles and permissions groups for Exchange and Office 365 accounts (Citation: Microsoft Msolrole)(Citation: GitHub Raindance).

Azure CLI (AZ CLI) and the Google Cloud Identity Provider API also provide interfaces to obtain permissions groups. The command <code>az ad user get-member-groups</code> will list groups associated to a user account for Azure while the API endpoint <code>GET https://cloudidentity.googleapis.com/v1/groups</code> lists group resources available to a user for Google.(Citation: Microsoft AZ CLI)(Citation: Black Hills Red Teaming MS AD Azure, 2018)(Citation: Google Cloud Identity API Documentation) In AWS, the commands `ListRolePolicies` and `ListAttachedRolePolicies` allow users to enumerate the policies attached to a role.(Citation: Palo Alto Unit 42 Compromised Cloud Compute Credentials 2022)

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 <code>GetBucketAcl</code> API (Citation: AWS Get Bucket ACL). 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.

Platforms: Azure AD
Office 365
SaaS
IaaS
Google Workspace
Tactics:
phase_name: discovery

Detection:
System and network discovery techniques normally occur throughout an operation as an adversary learns the environment. 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.

Monitor processes and command-line arguments for actions that could be taken to gather system and network information. Activity and account logs for the cloud services can also be monitored for suspicious commands that are anomalous compared to a baseline of normal activity.

References:
source_name: mitre-attack
description: Amazon Web Services. (n.d.). Retrieved May 28, 2021.
source_name: AWS Get Bucket ACL
description: Dror Alon. (2022, December 8). Compromised Cloud Compute Credentials: Case Studies From the Wild. Retrieved March 9, 2023.
source_name: Palo Alto Unit 42 Compromised Cloud Compute Credentials 2022
description: Felch, M.. (2018, August 31). Red Teaming Microsoft Part 1 Active Directory Leaks via Azure. Retrieved October 6, 2019.
source_name: Black Hills Red Teaming MS AD Azure, 2018
description: Google. (n.d.). Retrieved March 16, 2021.
source_name: Google Cloud Identity API Documentation
description: Microsoft. (n.d.). az ad user. Retrieved October 6, 2019.
source_name: Microsoft AZ CLI
description: Microsoft. (n.d.). Get-MsolRole. Retrieved October 6, 2019.
source_name: Microsoft Msolrole
description: Stringer, M.. (2018, November 21). RainDance. Retrieved October 6, 2019.
source_name: GitHub Raindance