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Kubernetes Cronjob

Description from ATT&CK

Adversaries may abuse task scheduling functionality provided by container orchestration tools such as Kubernetes to schedule deployment of containers configured to execute malicious code. Container orchestration jobs run these automated tasks at a specific date and time, similar to cron jobs on a Linux system. Deployments of this type can also be configured to maintain a quantity of containers over time, automating the process of maintaining persistence within a cluster.

In Kubernetes, a CronJob may be used to schedule a Job that runs one or more containers to perform specific tasks.(Citation: Kubernetes Jobs)(Citation: Kubernetes CronJob) An adversary therefore may utilize a CronJob to schedule deployment of a Job that executes malicious code in various nodes within a cluster.(Citation: Threat Matrix for Kubernetes)

Atomic Tests

Atomic Test #1 - ListCronjobs

Kubernetes Job is a controller that creates one or more pods and ensures that a specified number of them successfully terminate. Kubernetes Job can be used to run containers that perform finite tasks for batch jobs. Kubernetes CronJob is used to schedule Jobs. Attackers may use Kubernetes CronJob for scheduling execution of malicious code that would run as a container in the cluster.

Supported Platforms: containers

auto_generated_guid: ddfb0bc1-3c3f-47e9-a298-550ecfefacbd

Inputs:

Name Description Type Default Value
namespace K8s namespace to list string default

Attack Commands: Run with bash!

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kubectl get cronjobs -n #{namespace}

Dependencies: Run with bash!

Description: kubectl must be installed

Check Prereq Commands:

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2

which kubectl

Get Prereq Commands:

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echo "kubectl must be installed manually"

Atomic Test #2 - CreateCronjob

Kubernetes Job is a controller that creates one or more pods and ensures that a specified number of them successfully terminate. Kubernetes Job can be used to run containers that perform finite tasks for batch jobs. Kubernetes CronJob is used to schedule Jobs. Attackers may use Kubernetes CronJob for scheduling execution of malicious code that would run as a container in the cluster.

Supported Platforms: containers

auto_generated_guid: f2fa019e-fb2a-4d28-9dc6-fd1a9b7f68c3

Inputs:

Name Description Type Default Value
namespace K8s namespace to list string default

Attack Commands: Run with bash!

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2

kubectl create -f src/cronjob.yaml -n #{namespace}

Cleanup Commands:

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kubectl delete cronjob art -n #{namespace}

Dependencies: Run with bash!

Description: kubectl must be installed

Check Prereq Commands:

1
2

which kubectl

Get Prereq Commands:

1
2

echo "kubectl must be installed manually"

source