New attack technique: Execute Commands on GCE Instances via OS Config Agent (gcp.execution.os-config-run-command)#799
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April 30, 2026 12:28
| log.Printf("Creating OSPolicyAssignment %s in %s to run a shell command on targeted instances\n", | ||
| assignmentId, parent) | ||
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| _, err = svc.Projects.Locations.OsPolicyAssignments.Create( |
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This yields:
2026/04/30 15:03:04 Error while detonating attack technique gcp.execution.os-config-run-command: failed to create OSPolicyAssignment: googleapi: Error 400: OS configuration management has been disabled in this project. To use this feature, enable full VM Manager functionality. See https://cloud.google.com/compute/docs/manage-os#enable-full-vmm for instructions., failedPrecondition
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… Agent (gcp.execution.os-config-run-command) Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Address PR feedback: detonation fails with failedPrecondition when OS Configuration Management is not enabled at the project level. Note this in the description and clarify that the API call still produces the CreateOSPolicyAssignment audit event, so the attempt remains detectable even when execution does not succeed.
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What does this PR do?
New attack technique:
gcp.execution.os-config-run-commandMotivation
GCP parity with existing AWS attack techniques.
Test results
stratus detonate gcp.execution.os-config-run-commandgoogle.cloud.osconfig.v1.OsConfigZonalService.CreateOSPolicyAssignmentappears in GCP audit logs (requires non-default DATA_WRITE audit logging forosconfig.googleapis.com)Checklist