LoFP LoFP / there is a risk of false positives if there are several containers named the same, as the rule may correlate the request to the wrong container.

Techniques

Sample rules

Direct Interactive Kubernetes API Request by Unusual Utilities

Description

This rule leverages a combination of Defend for Containers and Kubernetes audit logs to detect the execution of direct interactive Kubernetes API requests via unusual utilities. An adversary may need to execute direct interactive Kubernetes API requests to gain access to the Kubernetes API server or other resources within the cluster. These requests are often used to enumerate the Kubernetes API server or other resources within the cluster, and may indicate an attempt to move laterally within the cluster.

Detection logic

sequence with maxspan=1s
  [process where host.os.type == "linux" and event.type == "start" and event.action == "exec" and process.interactive == true and
  container.id like "*" and
  /* Covered by the rule "Direct Interactive Kubernetes API Request by Common Utilities" */
  not (
     process.name in ("wget", "curl", "openssl", "socat", "ncat", "kubectl") or
     (
       /* Account for tools that execute utilities as a subprocess, in this case the target utility name will appear as a process arg */
       process.name in ("bash", "dash", "sh", "tcsh", "csh", "zsh", "ksh", "fish", "busybox") and
       process.args in (
         "wget", "/bin/wget", "/usr/bin/wget", "/usr/local/bin/wget",
         "ssl_client", "/bin/ssl_client", "/usr/bin/ssl_client", "/usr/local/bin/ssl_client",
         "curl", "/bin/curl", "/usr/bin/curl", "/usr/local/bin/curl",
         "openssl", "/bin/openssl", "/usr/bin/openssl", "/usr/local/bin/openssl",
         "socat", "/bin/socat", "/usr/bin/socat", "/usr/local/bin/socat",
         "ncat", "/bin/ncat", "/usr/bin/ncat", "/usr/local/bin/ncat",
         "kubectl", "/bin/kubectl", "/usr/bin/kubectl", "/usr/local/bin/kubectl"
       ) and
       /* default exclusion list to not FP on default multi-process commands */
       not process.args in (
         "which", "/bin/which", "/usr/bin/which", "/usr/local/bin/which",
         "man", "/bin/man", "/usr/bin/man", "/usr/local/bin/man",
         "chmod", "/bin/chmod", "/usr/bin/chmod", "/usr/local/bin/chmod",
         "chown", "/bin/chown", "/usr/bin/chown", "/usr/local/bin/chown"
       )
     ) or
     /* General exclusions for utilities that are not typically used for Kubernetes API requests */
     process.name in ("sleep", "head", "tail")
   )] by orchestrator.resource.name
  [any where
     event.dataset == "kubernetes.audit_logs" and
     kubernetes.audit.stage in ("ResponseStarted","ResponseComplete") and
     kubernetes.audit.verb in ("get", "list", "watch", "create", "patch", "update") and
     (
       kubernetes.audit.objectRef.resource in (
         "pods", "secrets", "serviceaccounts", "configmaps",
         "roles", "rolebindings", "clusterroles", "clusterrolebindings",
         "deployments", "daemonsets", "statefulsets", "jobs", "cronjobs",
         "nodes", "namespaces",
         "selfsubjectaccessreviews", "selfsubjectrulesreviews", "subjectaccessreviews"
       )
       or (
         kubernetes.audit.objectRef.resource == "pods" and
         kubernetes.audit.objectRef.subresource in ("exec", "attach", "portforward", "log")
       )
     )
  ] by `kubernetes.audit.user.extra.authentication.kubernetes.io/pod-name`

Service Account Token or Certificate Access Followed by Kubernetes API Request

Description

This rule leverages a combination of Defend for Containers and Kubernetes audit logs to detect the access to the service account token or certificate followed by the execution of a direct interactive Kubernetes API request. An adversary may need to access the service account token or certificate to gain access to the Kubernetes API server or other resources within the cluster. These requests are often used to enumerate the Kubernetes API server or other resources within the cluster, and may indicate an attempt to move laterally within the cluster.

Detection logic

sequence with maxspan=60s
  [file where host.os.type == "linux" and event.type == "change" and event.action == "open" and
   file.path in ("/var/run/secrets/kubernetes.io/serviceaccount/token", "/var/run/secrets/kubernetes.io/serviceaccount/ca.crt") and
   process.interactive == true and container.id like "*"] by orchestrator.resource.name
  [any where event.dataset == "kubernetes.audit_logs" and kubernetes.audit.stage in ("ResponseComplete", "ResponseStarted")] by `kubernetes.audit.user.extra.authentication.kubernetes.io/pod-name`

Forbidden Direct Interactive Kubernetes API Request

Description

This rule leverages a combination of Defend for Containers and Kubernetes audit logs to detect the execution of forbidden interactive Kubernetes API requests. An adversary may need to execute interactive Kubernetes API requests to gain access to the Kubernetes API server or other resources within the cluster. These requests are often used to enumerate the Kubernetes API server or other resources within the cluster, and may indicate an attempt to move laterally within the cluster. Attackers may attempt to access resources that are forbidden by the authorization policy. Note that this rule may not trigger if the authorization token of the request is expanded within the process argument list, as the length of the “process.args” field may lead to the field being ignored.

Detection logic

sequence with maxspan=1s
  [process where host.os.type == "linux" and event.type == "start" and event.action == "exec" and (
     process.name in ("wget", "curl", "openssl", "socat", "ncat", "kubectl") or
     (
       /* Account for tools that execute utilities as a subprocess, in this case the target utility name will appear as a process arg */
       process.name in ("bash", "dash", "sh", "tcsh", "csh", "zsh", "ksh", "fish", "busybox") and
       process.args in (
         "wget", "/bin/wget", "/usr/bin/wget", "/usr/local/bin/wget",
         "ssl_client", "/bin/ssl_client", "/usr/bin/ssl_client", "/usr/local/bin/ssl_client",
         "curl", "/bin/curl", "/usr/bin/curl", "/usr/local/bin/curl",
         "openssl", "/bin/openssl", "/usr/bin/openssl", "/usr/local/bin/openssl",
         "socat", "/bin/socat", "/usr/bin/socat", "/usr/local/bin/socat",
         "ncat", "/bin/ncat", "/usr/bin/ncat", "/usr/local/bin/ncat",
         "kubectl", "/bin/kubectl", "/usr/bin/kubectl", "/usr/local/bin/kubectl"
       ) and
       /* default exclusion list to not FP on default multi-process commands */
       not process.args in (
         "which", "/bin/which", "/usr/bin/which", "/usr/local/bin/which",
         "man", "/bin/man", "/usr/bin/man", "/usr/local/bin/man",
         "chmod", "/bin/chmod", "/usr/bin/chmod", "/usr/local/bin/chmod",
         "chown", "/bin/chown", "/usr/bin/chown", "/usr/local/bin/chown"
       )
     )
   ) and process.interactive == true and container.id like "*"
  ] by orchestrator.resource.name
  [any where event.dataset == "kubernetes.audit_logs" and kubernetes.audit.stage in ("ResponseComplete", "ResponseStarted") and
  `kubernetes.audit.annotations.authorization_k8s_io/decision` == "forbid"
  ] by `kubernetes.audit.user.extra.authentication.kubernetes.io/pod-name`

Direct Interactive Kubernetes API Request by Common Utilities

Description

This rule leverages a combination of Defend for Containers and Kubernetes audit logs to detect the execution of direct interactive Kubernetes API requests. An adversary may need to execute direct interactive Kubernetes API requests to gain access to the Kubernetes API server or other resources within the cluster. These requests are often used to enumerate the Kubernetes API server or other resources within the cluster, and may indicate an attempt to move laterally within the cluster. Note that this rule may not trigger if the authorization token of the request is expanded within the process argument list, as the length of the “process.args” field may lead to the field being ignored.

Detection logic

sequence with maxspan=1s
  [process where host.os.type == "linux" and event.type == "start" and event.action == "exec" and (
     process.name in ("wget", "curl", "openssl", "socat", "ncat", "kubectl") or
     (
       /* Account for tools that execute utilities as a subprocess, in this case the target utility name will appear as a process arg */
       process.name in ("bash", "dash", "sh", "tcsh", "csh", "zsh", "ksh", "fish", "busybox") and
       process.args in (
         "wget", "/bin/wget", "/usr/bin/wget", "/usr/local/bin/wget",
         "ssl_client", "/bin/ssl_client", "/usr/bin/ssl_client", "/usr/local/bin/ssl_client",
         "curl", "/bin/curl", "/usr/bin/curl", "/usr/local/bin/curl",
         "openssl", "/bin/openssl", "/usr/bin/openssl", "/usr/local/bin/openssl",
         "socat", "/bin/socat", "/usr/bin/socat", "/usr/local/bin/socat",
         "ncat", "/bin/ncat", "/usr/bin/ncat", "/usr/local/bin/ncat",
         "kubectl", "/bin/kubectl", "/usr/bin/kubectl", "/usr/local/bin/kubectl"
       ) and
       /* default exclusion list to not FP on default multi-process commands */
       not process.args in (
         "which", "/bin/which", "/usr/bin/which", "/usr/local/bin/which",
         "man", "/bin/man", "/usr/bin/man", "/usr/local/bin/man",
         "chmod", "/bin/chmod", "/usr/bin/chmod", "/usr/local/bin/chmod",
         "chown", "/bin/chown", "/usr/bin/chown", "/usr/local/bin/chown"
       )
     )
   ) and process.interactive == true and container.id like "*"
  ] by orchestrator.resource.name
  [any where event.dataset == "kubernetes.audit_logs" and kubernetes.audit.stage in ("ResponseComplete", "ResponseStarted")] by `kubernetes.audit.user.extra.authentication.kubernetes.io/pod-name`