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Host-based logs, container-based threats: How to tell where an attack began
- Containers, while providing isolated runtime environments, still pose security risks due to shared host system kernel.
- Many organizations lack container visibility for security monitoring, making it challenging for threat hunters and incident responders.
- Understanding how containers are created and operate is essential for investigating security incidents in containerized environments.
- Containers rely on namespaces, control groups, union filesystems, and Linux capabilities for resource management and isolation.
- Host-based execution logs are crucial for gaining insight into processes and activities within containers from the host's perspective.
- Different container creation workflows involve high-level container runtimes like containerd or CRI-O interacting with low-level runtimes like runc.
- Processes in detached containers are reparented to a shim process, which manages the standard input/output for the container and ensures process cleanup.
- BusyBox-based containers use minimalist utilities to reduce image sizes, with applets managing and executing commands within the container.
- Threat hunters can leverage knowledge of container execution behaviors, such as BusyBox processes, to detect suspicious activities within containers.
- Monitoring container activity and abnormal entrypoints is crucial for identifying and responding to container-based threats effectively.
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