{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","feed_url":"https://feed.craftedsignal.io/tags/falco/feed.json","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["Kubernetes"],"_cs_severities":["high"],"_cs_tags":["kubernetes","falco","shell"],"_cs_type":"advisory","_cs_vendors":["Kubernetes"],"content_html":"\u003cp\u003eThis detection identifies instances where a shell is spawned within a Kubernetes container. It uses Falco, a cloud-native runtime security tool, to monitor system calls within the Kubernetes environment and flag when a shell is spawned. This activity is significant because it may indicate unauthorized access, allowing an attacker to execute arbitrary commands, manipulate container processes, or escalate privileges. The analytic was last updated on 2026-04-15. The potential impact of this activity includes data breaches, service disruptions, or unauthorized access to sensitive information, severely impacting the Kubernetes infrastructure's integrity and security. The rule is based on Kubernetes Falco logs.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAn attacker gains initial access to a Kubernetes cluster, potentially through compromised credentials or a vulnerable application.\u003c/li\u003e\n\u003cli\u003eThe attacker identifies a target container within the Kubernetes environment.\u003c/li\u003e\n\u003cli\u003eThe attacker executes a command to spawn a shell (e.g., bash, sh) within the targeted container. This could be achieved through tools like \u003ccode\u003ekubectl exec\u003c/code\u003e.\u003c/li\u003e\n\u003cli\u003eFalco detects the shell spawning event by monitoring system calls within the container runtime.\u003c/li\u003e\n\u003cli\u003eThe detection rule triggers based on the \u0026quot;A shell was spawned in a container\u0026quot; Falco event.\u003c/li\u003e\n\u003cli\u003eThe attacker uses the spawned shell to execute further commands, potentially escalating privileges within the container.\u003c/li\u003e\n\u003cli\u003eThe attacker may use the compromised container to access other resources within the Kubernetes cluster or the wider network.\u003c/li\u003e\n\u003cli\u003eThe attacker achieves their objective, such as data exfiltration, service disruption, or lateral movement.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eCompromising a Kubernetes container by spawning a shell can lead to significant damage. The attacker can execute arbitrary commands, leading to data breaches, service disruptions, and unauthorized access to sensitive information. This activity can severely impact the Kubernetes infrastructure's integrity and security. The rule triggers on any instance where a shell is spawned, regardless of intent; therefore, analysts need to assess the surrounding context.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eEnable Kubernetes audit logging and configure Falco to monitor system calls within containers to detect shell spawning events as described in the documentation (\u003ca href=\"https://kubernetes.io/docs/tasks/debug/debug-cluster/audit/)\"\u003ehttps://kubernetes.io/docs/tasks/debug/debug-cluster/audit/)\u003c/a\u003e.\u003c/li\u003e\n\u003cli\u003eDeploy the provided Sigma rule to your SIEM to detect suspicious shell spawning activities within Kubernetes containers, tuning the rule for your specific environment.\u003c/li\u003e\n\u003cli\u003eInvestigate any alerts generated by the Sigma rule, focusing on the user and container involved to determine if the activity is legitimate.\u003c/li\u003e\n\u003cli\u003eReview and restrict the use of \u003ccode\u003ekubectl exec\u003c/code\u003e and similar commands to authorized personnel only.\u003c/li\u003e\n\u003cli\u003eImplement network policies to limit communication between containers, reducing the potential impact of a compromised container.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2024-01-03T12:00:00Z","date_published":"2024-01-03T12:00:00Z","id":"https://feed.craftedsignal.io/briefs/2024-01-kubernetes-falco-shell/","summary":"This analytic detects when a shell is spawned within a Kubernetes container using Falco, potentially indicating unauthorized access, command execution, process manipulation, or privilege escalation, which can lead to data breaches and service disruptions.","title":"Kubernetes Shell Spawned via Falco","url":"https://feed.craftedsignal.io/briefs/2024-01-kubernetes-falco-shell/"}],"language":"en","title":"CraftedSignal Threat Feed - Falco","version":"https://jsonfeed.org/version/1.1"}