LoFP / the creation of a new federation is not necessarily malicious, however this events need to be followed closely, as it may indicate federated credential abuse or backdoor via federated identities at a different cloud provider.

Techniques

• T1136
• T1136.003

Sample rules

O365 Add App Role Assignment Grant User

• source: splunk
• technicques:
  • T1136.003
  • T1136

Description

The following analytic detects the addition of an application role assignment grant to a user in Office 365. It leverages data from the o365_management_activity dataset, specifically monitoring the “Add app role assignment grant to user” operation. This activity is significant as it can indicate unauthorized privilege escalation or the assignment of sensitive roles to users. If confirmed malicious, this could allow an attacker to gain elevated permissions, potentially leading to unauthorized access to critical resources and data within the Office 365 environment.

Detection logic

`o365_management_activity` Workload=AzureActiveDirectory Operation="Add app role assignment grant to user." 
| stats count min(_time) as firstTime max(_time) as lastTime values(Actor{}.ID) as Actor.ID values(Actor{}.Type) as Actor.Type values(ModifiedProperties{}.Name) as modified_properties_name by user dest ResultStatus Operation 
| `security_content_ctime(firstTime)` 
| `security_content_ctime(lastTime)` 
| `o365_add_app_role_assignment_grant_user_filter`