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+title: AWS Suspicious SAML Activity 
+id: f43f5d2f-3f2a-4cc8-b1af-81fde7dbaf0e
+description: Identifies when suspicious SAML activity has occurred in AWS. An adversary could gain backdoor access via SAML.
+author: Austin Songer
+status: experimental
+date: 2021/09/22
+references:
+    - https://docs.aws.amazon.com/IAM/latest/APIReference/API_UpdateSAMLProvider.html
+    - https://docs.aws.amazon.com/STS/latest/APIReference/API_AssumeRoleWithSAML.html
+logsource:
+    service: cloudtrail
+detection:
+    selection1:
+        eventSource: sts.amazonaws.com
+        eventName: Assumerolewithsaml
+    selection2:
+        eventSource: iam.amazonaws.com
+        eventName: UpdateSAMLProvider
+    condition: selection1 or selection2
+level: medium
+tags:
+    - attack.initial_access
+    - attack.t1078
+    - attack.lateral_movement
+    - attack.t1548
+    - attack.privilege_escalation
+    - attack.t1550
+    - attack.t1550.001
+falsepositives:
+ - Automated processes that uses Terraform may lead to false positives.
+ - SAML Provider could be updated by a system administrator. Verify whether the user identity, user agent, and/or hostname should be making changes in your environment. 
+ - SAML Provider being updated from unfamiliar users should be investigated. If known behavior is causing false positives, it can be exempted from the rule.