What attackers do. Attackers deploy a container into an environment to run their tools or evade defences, for example a container with a malicious image or with broad access to the host. This serves Defence Evasion and Execution.
How to defend. Restrict who can deploy containers, require images from trusted registries, scan images, and use admission control policies that block privileged containers and host mounts. Protect container runtime APIs and orchestration dashboards from unauthenticated access. Collect audit logs from orchestration platforms and container runtimes so deployments can be traced to an identity. Runtime security tools can watch container behaviour after it starts.
Signs to look for. Look for containers from unknown images or registries, new deployments by unusual accounts, containers with privileged settings and access to exposed container APIs from the internet. A common gap is exposed container management interfaces without authentication.