diff --git a/rules/integrations/kubernetes/discovery_suspicious_self_subject_review.toml b/rules/integrations/kubernetes/discovery_suspicious_self_subject_review.toml new file mode 100644 index 000000000..7302029d3 --- /dev/null +++ b/rules/integrations/kubernetes/discovery_suspicious_self_subject_review.toml @@ -0,0 +1,62 @@ +[metadata] +creation_date = "2022/06/30" +integration = "kubernetes" +maturity = "production" +min_stack_comments = "Necessary audit log fields not available prior to 8.2" +min_stack_version = "8.2" +updated_date = "2022/06/30" + +[rule] +author = ["Elastic"] +description = """ +This rule detects when a service account or node attempts to enumerate their own permissions via the +selfsubjectaccessreview or selfsubjectrulesreview APIs. This is highly unusual behavior for non-human identities like +service accounts and nodes. An adversary may have gained access to credentials/tokens and this could be an attempt to +determine what privileges they have to facilitate further movement or execution within the cluster. +""" +false_positives = [ + """ + An administrator may submit this request as an "impersonatedUser" to determine what privileges a particular service + account has been granted. However, an adversary may utilize the same technique as a means to determine the + privileges of another token other than that of the compromised account. + """, +] +index = ["logs-kubernetes.*"] +language = "kuery" +license = "Elastic License v2" +name = "Kubernetes Suspicious Self-Subject Review" +note = """## Setup + +The Kubernetes Fleet integration with Audit Logs enabled or similarly structured data is required to be compatible with this rule.""" +references = [ + "https://www.paloaltonetworks.com/apps/pan/public/downloadResource?pagePath=/content/pan/en_US/resources/whitepapers/kubernetes-privilege-escalation-excessive-permissions-in-popular-platforms", + "https://kubernetes.io/docs/reference/access-authn-authz/authorization/#checking-api-access", + "https://techcommunity.microsoft.com/t5/microsoft-defender-for-cloud/detecting-identity-attacks-in-kubernetes/ba-p/3232340", +] +risk_score = 47 +rule_id = "12a2f15d-597e-4334-88ff-38a02cb1330b" +severity = "medium" +tags = ["Elastic", "Kubernetes", "Continuous Monitoring", "Discovery"] +timestamp_override = "event.ingested" +type = "query" + +query = ''' +kubernetes.audit.verb:"create" +and kubernetes.audit.objectRef.resource:("selfsubjectaccessreviews" or "selfsubjectrulesreviews") +and kubernetes.audit.user.username:(system\:serviceaccount\:* or system\:node\:*) or kubernetes.audit.impersonatedUser.username:(system\:serviceaccount\:* or system\:node\:*) +''' + + +[[rule.threat]] +framework = "MITRE ATT&CK" +[[rule.threat.technique]] +id = "T1613" +name = "Container and Resource Discovery" +reference = "https://attack.mitre.org/techniques/T1613/" + + +[rule.threat.tactic] +id = "TA0007" +name = "Discovery" +reference = "https://attack.mitre.org/tactics/TA0007/" +