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First Time GCP Vertex AI Agent Engine Sandbox Code Execution by User and Source ASN

Detects the first time a Vertex AI Agent Engine caller executes code in a sandboxEnvironment from a given source autonomous system. First-time sandbox execution by a user and source ASN can indicate a new workload,…

Description

Detects the first time a Vertex AI Agent Engine caller executes code in a sandboxEnvironment from a given source autonomous system. First-time sandbox execution by a user and source ASN can indicate a new workload, stolen credentials used from an unusual network, or early Agent Engine abuse before broader sandbox reuse is visible.

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
ContainersESXiIaaSIdentity ProviderLinuxmacOSNetwork DevicesOffice SuiteSaaSWindows

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

Log source category
event_index

Known benign triggers

  • Developers, notebooks, and CI service accounts execute sandbox code from new offices, home ISPs, or cloud egress ASNs until baselined. Exclude known build and research identities after review.

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