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Detect when an attempt to add or modify a startup script to the GCE instance metadata occurs.
This rule monitors Google Cloud Audit Logs to determine when an attempt to add or modify a start up script to the GCE instance metadata has occurred. A malicious actor who has already gained initial access may try to preserve access to GCE instances by adding a custom startup script to the instance metadata.
Note: This rule triggers with a Medium
severity when this activity originates from an anonymizing proxy.
{{@network.client.ip}}
has taken other actions.