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Update v8.16.2

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IMPORTANT: This documentation is no longer updated. Refer to Elastic's version policy and the latest documentation.

Update v8.16.2

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This section lists all updates associated with version 8.16.2 of the Fleet integration Prebuilt Security Detection Rules.

Rule Description Status Version

AWS STS AssumeRoot by Rare User and Member Account

Identifies when the STS AssumeRoot action is performed by a rare user in AWS. The AssumeRoot action allows users to assume the root member account role, granting elevated but specific permissions based on the task policy specified. Adversaries whom may have compromised user credentials, such as access and secret keys, can use this technique to escalate privileges and gain unauthorized access to AWS resources. This is a [New Terms](https://www.elastic.co/guide/en/security/current/rules-ui-create.html#create-new-terms-rule) rule that identifies when the STS AssumeRoot action is performed by a user that rarely assumes this role and specific member account.

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