diff --git a/rules/linux/defense_evasion_clear_kernel_ring_buffer.toml b/rules/linux/defense_evasion_clear_kernel_ring_buffer.toml new file mode 100644 index 000000000..c6c03b022 --- /dev/null +++ b/rules/linux/defense_evasion_clear_kernel_ring_buffer.toml @@ -0,0 +1,91 @@ +[metadata] +creation_date = "2023/10/24" +integration = ["endpoint"] +maturity = "production" +min_stack_comments = "New fields added: required_fields, related_integrations, setup" +min_stack_version = "8.3.0" +updated_date = "2023/10/24" + +[rule] +author = ["Elastic"] +description = """ +Monitors for the deletion of the kernel ring buffer events through dmesg. Attackers may clear kernel ring buffer events +to evade detection after installing a Linux kernel module (LKM). +""" +from = "now-9m" +index = ["logs-endpoint.events.*"] +language = "eql" +license = "Elastic License v2" +name = "Attempt to Clear Kernel Ring Buffer" +risk_score = 21 +rule_id = "2724808c-ba5d-48b2-86d2-0002103df753" +setup = """ + +This rule requires data coming in from Elastic Defend. + +### Elastic Defend Integration Setup +Elastic Defend is integrated into the Elastic Agent using Fleet. Upon configuration, the integration allows +the Elastic Agent to monitor events on your host and send data to the Elastic Security app. + +#### Prerequisite Requirements: +- Fleet is required for Elastic Defend. +- To configure Fleet Server refer to the [documentation](https://www.elastic.co/guide/en/fleet/current/fleet-server.html). + +#### The following steps should be executed in order to add the Elastic Defend integration on a Linux System: +- Go to the Kibana home page and click Add integrations. +- In the query bar, search for Elastic Defend and select the integration to see more details about it. +- Click Add Elastic Defend. +- Configure the integration name and optionally add a description. +- Select the type of environment you want to protect, either Traditional Endpoints or Cloud Workloads. +- Select a configuration preset. Each preset comes with different default settings for Elastic Agent, you can further customize these later by configuring the Elastic Defend integration policy. [Helper guide](https://www.elastic.co/guide/en/security/current/configure-endpoint-integration-policy.html). +- We suggest to select "Complete EDR (Endpoint Detection and Response)" as a configuration setting, that provides "All events; all preventions" +- Enter a name for the agent policy in New agent policy name. If other agent policies already exist, you can click the Existing hosts tab and select an existing policy instead. +For more details on Elastic Agent configuration settings, refer to the [helper guide](https://www.elastic.co/guide/en/fleet/8.10/agent-policy.html). +- Click Save and Continue. +- To complete the integration, select Add Elastic Agent to your hosts and continue to the next section to install the Elastic Agent on your hosts. +For more details on Elastic Defend refer to the [helper guide](https://www.elastic.co/guide/en/security/current/install-endpoint.html). + +""" +severity = "low" +tags = [ + "Domain: Endpoint", + "OS: Linux", + "Use Case: Threat Detection", + "Tactic: Defense Evasion", + "Data Source: Elastic Defend" + ] +timestamp_override = "event.ingested" +type = "eql" +query = ''' +process where host.os.type == "linux" and event.action == "exec" and event.type == "start" and +process.name == "dmesg" and process.args : "-c" +''' + +[[rule.threat]] +framework = "MITRE ATT&CK" + +[[rule.threat.technique]] +name = "Impair Defenses" +id = "T1562" +reference = "https://attack.mitre.org/techniques/T1562/" + +[[rule.threat.technique.subtechnique]] +name = "Disable or Modify Tools" +id = "T1562.001" +reference = "https://attack.mitre.org/techniques/T1562/001/" + +[[rule.threat.technique]] +name = "Indicator Removal" +id = "T1070" +reference = "https://attack.mitre.org/techniques/T1070/" + +[[rule.threat.technique.subtechnique]] +name = "Clear Linux or Mac System Logs" +id = "T1070.002" +reference = "https://attack.mitre.org/techniques/T1070/002/" + +[rule.threat.tactic] +name = "Defense Evasion" +id = "TA0005" +reference = "https://attack.mitre.org/tactics/TA0005/" +