Suspicious Cgroup release_agent Abuse for Container Escape

ATT&CK techniques

Priv Esc

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
- T1611Escape to Host
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects command activity referencing the cgroup release_agent and notify_on_release mechanism used to break out of a container and execute code on the host. Writing a release_agent path that runs on cgroup teardown is a classic privileged container escape. Detecting this reference exposes an attempted breakout to the underlying node.

Reporting behind it

Related detections6 linkedT1611 — drag to rearrange

Malicious Privileged Container Creation in Kubernetes (via audit)

Malicious Docker Socket Access via Curl Unix Socket

Malicious Direct etcd Write to Kubernetes Registry via ETCDCTL_API (via process_creation)

Malicious Container Escape via core_pattern Hijack (via process_creation)

Kubernetes Pod Created With hostPath Volume Mount

Kubernetes Privileged Pod Created via Pod Creation Requests

Suspicious Cgroup release_agent Abuse for Container Escape

Pivot detection · T1611 · 6 related

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.

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