Adversaries may attempt to discover group and permission settings. This information can help adversaries determine which user accounts and groups are available, the membership of users in particular groups, and which users and groups have elevated permissions.

Adversaries may attempt to discover group permission settings in many different ways. This data may provide the adversary with information about the compromised environment that can be used in follow-on activity and targeting.[1]

References

  1. Red Team Labs. (2018, April 24). Hidden Administrative Accounts: BloodHound to the Rescue. Retrieved October 28, 2020.

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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 Get-MsolRole PowerShell cmdlet can be used to obtain roles and permissions groups for Exchange and Office 365 accounts[1],[2].

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.[3],[4],[5] In AWS, the commands ListRolePolicies and ListAttachedRolePolicies allow users to enumerate the policies attached to a role.[6]

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[7]. 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.

References

  1. Microsoft. (n.d.). Get-MsolRole. Retrieved October 6, 2019.
  2. Stringer, M.. (2018, November 21). RainDance. Retrieved October 6, 2019.
  3. Microsoft. (n.d.). az ad user. Retrieved October 6, 2019.
  4. Felch, M.. (2018, August 31). Red Teaming Microsoft Part 1 Active Directory Leaks via Azure. Retrieved October 6, 2019.
  5. Google. (n.d.). Retrieved March 16, 2021.
  6. Dror Alon. (2022, December 8). Compromised Cloud Compute Credentials: Case Studies From the Wild. Retrieved March 9, 2023.
  7. Amazon Web Services. (n.d.). Retrieved May 28, 2021.
Domain Groups

Adversaries may attempt to find domain-level groups and permission settings. The knowledge of domain-level permission groups can help adversaries determine which groups exist and which users belong to a particular group. Adversaries may use this information to determine which users have elevated permissions, such as domain administrators.

Commands such as net group /domain of the Net utility, dscacheutil -q group on macOS, and ldapsearch on Linux can list domain-level groups.
Local Groups

Adversaries may attempt to find local system groups and permission settings. The knowledge of local system permission groups can help adversaries determine which groups exist and which users belong to a particular group. Adversaries may use this information to determine which users have elevated permissions, such as the users found within the local administrators group.

Commands such as net localgroup of the Net utility, dscl . -list /Groups on macOS, and groups on Linux can list local groups.

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is blocked by Behavioral Detection of Permission Groups Discovery