AWS STS GetSessionToken Misuse by IAM User
This rule identifies the suspicious use of the AWS Security Token Service (STS) API call `GetSessionToken`. This API call is used to request temporary, limited-privilege credentials for an IAM user or role. Attackers may use `GetSessionToken` to generate temporary tokens to move laterally within an AWS environment or escalate privileges by assuming roles with broader permissions. The rule specifically looks for `GetSessionToken` calls made by an `IAMUser`.
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