Kubernetes (K8s) is an open-source container orchestration platform designed to automate application container deployment, scaling, and running.  Containers are isolated software packages that are lightweight and contain everything required for running an app.  In Kubernetes, a “sidecar” refers to an additional container that runs alongside the main application container in the same pod to enhance its capabilities.  However, cybersecurity researchers at TrendMicro recently discovered that threat actors can leverage the Sidecar Container injection technique to remain stealthily. Sidecar Container Injection Technique Sidecar containers help modularize features and functionalities that do not directly relate to the main application logic but which are necessary for efficient operation.

Source: GBHackers