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AWS Systems Manager SecureString Parameter Request with Decryption Flag

Detects the first occurrence of a user identity accessing AWS Systems Manager (SSM) SecureString parameters using the GetParameter or GetParameters API actions with credentials in the request parameters. This could…

Description

Detects the first occurrence of a user identity accessing AWS Systems Manager (SSM) SecureString parameters using the GetParameter or GetParameters API actions with credentials in the request parameters. This could indicate that the user is accessing sensitive information. This rule detects when a user accesses a SecureString parameter with the withDecryption parameter set to true. This is a New Terms rule that detects the first occurrence of an AWS identity accessing SecureString parameters with decryption.

Detection logic

Its licence does not clear it for publishing here

Sunturai publishes a detection's own text where the licence it arrived under has been reviewed and permits it, and Elastic License 2.0 has not. The query as its source wrote it, its canonical form and the hash that pins this revision are in the workspace record.

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Detection requirements

Platform
IaaSLinuxmacOSWindows

The rule states no platform. This is derived from the ATT&CK technique it maps to.

Log source category
event_index

Known benign triggers

  • Users may legitimately access AWS Systems Manager (SSM) parameters using the GetParameter, GetParameters, or DescribeParameters API actions with credentials in the request parameters. Ensure that the user has a legitimate reason to access the parameters and that the credentials are secured.

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