Detect Additional Cloud Roles in Elastic Security
An adversary may add additional roles or permissions to an adversary-controlled cloud account to maintain persistent access to a tenant. For example, adversaries may update IAM policies in cloud-based environments or add a new global administrator in Office 365 environments. With sufficient permissions, a compromised account can gain almost unlimited access to data and settings, including the ability to reset the passwords of other admins. This account modification may immediately follow account creation or other malicious account activity. Adversaries may also modify existing valid accounts that they have compromised, potentially leading to privilege escalation and lateral movement to additional accounts. In some cases, adversaries may add roles to adversary-controlled accounts outside the victim cloud tenant, allowing external accounts to perform actions inside the victim tenant. Threat groups such as Scattered Spider, LAPSUS$, and Storm-0501 have used this technique to gain persistent administrative access to cloud environments.
MITRE ATT&CK
- Tactic
- Persistence Privilege Escalation
- Technique
- T1098 Account Manipulation
- Sub-technique
- T1098.003 Additional Cloud Roles
- Canonical reference
- https://attack.mitre.org/techniques/T1098/003/
Elastic Detection Query
any where event.dataset in ("azure.auditlogs", "o365.audit", "azure.activitylogs") and
event.outcome == "success" and
(
event.action in~ (
"add member to role.",
"add eligible member to role.",
"add member to role in pim requested.",
"add member to role completed (pim activation).",
"assign directory role to user",
"microsoft.authorization/roleassignments/write",
"microsoft.authorization/elevateaccess/action",
"microsoft.authorization/roledefinitions/write"
)
or (
event.action like~ "*role*"
and (event.action like~ "*add*" or event.action like~ "*assign*" or event.action like~ "*write*")
)
)Detects cloud role assignment operations in Azure AD/Entra ID, Azure RBAC, and Office 365 environments, including PIM activations and RBAC write operations. Uses Elastic Common Schema fields as normalized by the Elastic Azure and O365 integrations. The event.action field is populated from OperationName (Azure) or Operation (O365) by the integration.
Data Sources
Required Tables
False Positives & Tuning
- IT administrators legitimately assigning roles during new employee onboarding or scheduled periodic access reviews
- Automated provisioning workflows such as Azure AD Lifecycle Workflows or IGA platforms assigning roles as part of approved joiner processes
- PIM role activations by authorized privileged users performing time-limited administrative tasks
- Infrastructure-as-Code pipelines assigning Azure RBAC roles to managed identities during resource group or subscription deployments
Other platforms for T1098.003
Testing Methodology
Validate this detection against 4 adversary techniques from Atomic Red Team. Each test below lists the behaviour to exercise and the telemetry you should expect to see. Executable commands and cleanup steps are available with Pro.
- Test 1Assign Global Administrator Role to User via Azure AD PowerShell
Expected signal: Azure AD AuditLogs: OperationName 'Add member to role' with TargetResources containing the target UPN and RoleName 'Global Administrator'. InitiatedBy will show the executing account's UPN and IP address. Event appears in AuditLogs within 5-15 minutes. Unified Audit Log: RecordType 8, Operation 'Add member to role.' with similar details.
- Test 2Assign Azure Subscription Owner Role via Az PowerShell (RBAC Escalation)
Expected signal: AzureActivity log: OperationNameValue 'Microsoft.Authorization/roleAssignments/write' with ActivityStatusValue 'Success', Caller set to the executing account, ResourceId containing the subscription scope and roleAssignment GUID. Event appears in AzureActivity within 2-5 minutes.
- Test 3Use elevateAccess API to Gain User Access Administrator at Root Scope
Expected signal: AzureActivity log: OperationNameValue 'Microsoft.Authorization/elevateAccess/action' with ActivityStatusValue 'Success', Caller set to the Global Admin account. A second event 'Microsoft.Authorization/roleAssignments/write' at scope '/' will also appear as the role is auto-assigned.
- Test 4Add External Guest Account to Privileged Role via Microsoft Graph API
Expected signal: Azure AD AuditLogs: OperationName 'Add member to role' with TargetResources showing the guest account UPN (ending in #EXT# or external domain) and RoleName 'Security Administrator'. InitiatedBy shows the account that executed the Graph API call with its IP address. Graph API calls appear as 'Microsoft Graph' in the InitiatedBy.app field when authenticated via service principal.
References (14)
- https://attack.mitre.org/techniques/T1098/003/
- https://docs.microsoft.com/en-us/office365/admin/add-users/about-admin-roles?view=o365-worldwide
- https://docs.aws.amazon.com/IAM/latest/UserGuide/access_policies.html
- https://cloud.google.com/iam/docs/policies
- https://rhinosecuritylabs.com/aws/aws-privilege-escalation-methods-mitigation/
- https://expel.com/blog/incident-report-from-cli-to-console-chasing-an-attacker-in-aws/
- https://www.microsoft.com/security/blog/2022/03/22/dev-0537-criminal-actor-targeting-organizations-for-data-exfiltration-and-destruction/
- https://www.microsoft.com/security/blog/2023/10/25/octo-tempest-crosses-boundaries-to-facilitate-extortion-encryption-and-destruction/
- https://www.invictus-ir.com/news/the-curious-case-of-dangerdev-protonmail-me
- https://learn.microsoft.com/en-us/azure/active-directory/roles/security-planning
- https://learn.microsoft.com/en-us/azure/role-based-access-control/elevate-access-global-admin
- https://learn.microsoft.com/en-us/azure/active-directory/privileged-identity-management/pim-configure
- https://learn.microsoft.com/en-us/azure/azure-monitor/essentials/activity-log
- https://learn.microsoft.com/en-us/microsoft-365/compliance/search-the-audit-log-in-security-and-compliance
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