Query: detect Identifies when ClusterRoles/Roles are being modified or deleted. in logs
Matching passage: Sigma rule: Identifies when ClusterRoles/Roles are being modified or deleted.. Logsource: azure / activitylogs. Rule: title: Azure Kubernetes Sensitive Role Access id: 818fee0c-e0ec-4e45-824e-83e4817b0887 status: test description: Identifies when ClusterRoles/Roles are being modified or deleted. references: - https://learn.microsoft.com/en-us/azure/role-based-access-control/resource-provider-operations#microsoftkubernetes - https://www.microsoft.com/security/blog/2021/03/23/secure-containerized-environments-with-updated-threat-matrix-for-kubernetes/ - https://www.microsoft.com/security/blog/2020/04/02/attack-matrix-kubernetes/ - https://medium.com/mitre-engenuity/att-ck-for-containers-now-available-4c2359654bf1 author: Austin Songer @austinsonger date: 2021-08-07 modified: 2022-08-23 tags: - attack.impact - attack.t1485 - attack.t1496 - attack.t1489 logsource: product: azure service: activitylogs detection: selection: operationName: - MICROSOFT.KUBERNETES/CONNECTEDCLUSTERS/RBAC.AUTHORIZATION.K8S.IO/ROLES/WRITE - MICROSOFT.KUBERNETES/CONNECTEDCLUSTERS/RBAC.AUTHORIZATION.K8S.IO/ROLES/DELETE - MICROSOFT.KUBERNETES/CONNECTEDCLUSTERS/RBAC.AUTHORIZATION.K8S.IO/ROLES/BIND/ACTION - MICROSOFT.KUBERNETES/CONNECTEDCLUSTERS/RBAC.AUTHORIZATION.K8S.IO/ROLES/ESCALATE/ACTION - MICROSOFT.KUBERNETES/CONNECTEDCLUSTERS/RBAC.AUTHORIZATION.K8S.IO/CLUSTERROLES/WRITE - MICROSOFT.KUBERNETES/CONNECTEDCLUSTERS/RBAC.AUTHORIZATION.K8S.IO/CLUSTERROLES/DELETE - MICROSOFT.KUBERNETES/CONNECTEDCLUSTERS/RBAC.AUTHORIZATION.K8S.IO/CLUSTERROLES/BIND/ACTION - MICROSOFT.KUBERNETES/CONNECTEDCLUSTERS/RBAC.AUTHORIZATION.K8S.IO/CLUSTERROLES/ESCALATE/ACTION condition: selection falsepositives: - ClusterRoles/Roles being modified and deleted may be performed by a system administrator. Verify whether the user identity, user agent, and/or hostname should be making changes in your environment. - ClusterRoles/Roles modification from unfamiliar users should be investigated. If known behavior is causing false positives, it can be exempted from the rule. level: medium
Near-miss passage: Sigma rule: Detects changes of sensitive and critical files. Monitors files that you don't expect to change without planning on Linu. Logsource: linux / process_creation. Rule: title: Potential Suspicious Change To Sensitive/Critical Files id: 86157017-c2b1-4d4a-8c33-93b8e67e4af4 status: test description: 'Detects changes of sensitive and critical files. Monitors files that you don''t expect to change without planning on Linux system. These files include, but are not limited to, system configuration files, authentication files, and critical application files. Attackers often target these files to maintain persistence, escalate privileges, or disrupt system operations. ' references: - https://learn.microsoft.com/en-us/azure/defender-for-cloud/file-integrity-monitoring-overview#which-files-should-i-monitor author: '@d4ns4n_ (Wuerth-Phoenix)' date: 2023-05-30 modified: 2026-03-18 tags: - attack.impact - attack.t1565.001 logsource: category: process_creation product: linux detection: selection_img_1: Image|endswith: - /cat - /echo - /grep - /head - /more - /tail CommandLine|contains: '>' selection_img_2: Image|endswith: - /emacs - /nano - /sed - /vi - /vim selection_paths: CommandLine|contains: - /bin/login - /bin/passwd - /boot/ - /etc/*.conf - /etc/cron. - /etc/crontab - /etc/hosts - /etc/init.d - /etc/sudoers - /opt/bin/ - /sbin - /usr/bin/ - /usr/local/bin/ filter_main_mdadm.conf: Image|endswith: /bin/sed CommandLine|startswith: - sed -i /^* - sed -ne s/^ CommandLine|endswith: /etc/mdadm/mdadm.conf condition: 1 of selection_img_* and selection_paths and not 1 of filter_main_* falsepositives: - Some false positives are to be expected on user or administrator machines. Apply additional filters as needed. level: medium