Ruben Groenewoud
a7ff449fbc
* [Rule Tuning] Doing some quick tunings * updated_date bump * Update rules/linux/discovery_linux_modprobe_enumeration.toml * Update rules/linux/discovery_linux_modprobe_enumeration.toml * Update rules/linux/discovery_linux_sysctl_enumeration.toml * Update rules/linux/persistence_init_d_file_creation.toml * Update rules/linux/persistence_rc_script_creation.toml * Update rules/linux/persistence_shared_object_creation.toml * deprecate rule * deprecate rule * Update execution_abnormal_process_id_file_created.toml * Update discovery_kernel_module_enumeration_via_proc.toml * Update discovery_linux_modprobe_enumeration.toml * Update execution_remote_code_execution_via_postgresql.toml * Update discovery_potential_syn_port_scan_detected.toml * Added 2 tunings, sorry I missed those.. * One more tune * Update discovery_suspicious_proc_enumeration.toml
70 lines
3.0 KiB
TOML
70 lines
3.0 KiB
TOML
[metadata]
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creation_date = "2023/06/08"
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integration = ["auditd_manager"]
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maturity = "production"
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min_stack_comments = "New fields added: required_fields, related_integrations, setup"
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min_stack_version = "8.3.0"
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updated_date = "2023/07/31"
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[rule]
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author = ["Elastic"]
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description = """
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Detects file events involving kernel modules in modprobe configuration files, which may indicate unauthorized access or
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manipulation of critical kernel modules. Attackers may tamper with the modprobe files to load malicious or unauthorized
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kernel modules, potentially bypassing security measures, escalating privileges, or hiding their activities within the
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system.
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"""
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from = "now-9m"
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index = ["auditbeat-*", "logs-auditd_manager.auditd-*"]
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language = "eql"
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license = "Elastic License v2"
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name = "Suspicious Modprobe File Event"
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note = """## Setup
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This rule requires the use of the `auditd_manager` integration. `Auditd_manager` is a tool designed to simplify and enhance the management of the audit subsystem in Linux systems. It provides a user-friendly interface and automation capabilities for configuring and monitoring system auditing through the auditd daemon. With `auditd_manager`, administrators can easily define audit rules, track system events, and generate comprehensive audit reports, improving overall security and compliance in the system. The following steps should be executed in order to install and deploy `auditd_manager` on a Linux system.
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```
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Kibana -->
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Management -->
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Integrations -->
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Auditd Manager -->
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Add Auditd Manager
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```
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`Auditd_manager` subscribes to the kernel and receives events as they occur without any additional configuration. However, if more advanced configuration is required to detect specific behavior, audit rules can be added to the integration in either the "audit rules" configuration box or the "auditd rule files" box by specifying a file to read the audit rules from.
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For this detection rule to trigger, the following additional audit rules are required to be added to the integration:
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```
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-w /etc/modprobe.conf -p wa -k modprobe
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-w /etc/modprobe.d -p wa -k modprobe
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```
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Add the newly installed `auditd manager` to an agent policy, and deploy the agent on a Linux system from which auditd log files are desirable.
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"""
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risk_score = 21
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rule_id = "40ddbcc8-6561-44d9-afc8-eefdbfe0cccd"
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severity = "low"
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tags = ["OS: Linux", "Use Case: Threat Detection", "Tactic: Discovery"]
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timestamp_override = "event.ingested"
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type = "eql"
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query = '''
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file where host.os.type == "linux" and event.action == "opened-file" and
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file.path : ("/etc/modprobe.conf", "/etc/modprobe.d", "/etc/modprobe.d/*") and not
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(
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process.name in ("auditbeat", "kmod", "modprobe", "lsmod", "insmod", "modinfo", "rmmod", "dpkg", "cp") or
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process.title : "*grep*" or process.parent.pid == 1
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)
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'''
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[[rule.threat]]
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framework = "MITRE ATT&CK"
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[[rule.threat.technique]]
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id = "T1082"
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name = "System Information Discovery"
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reference = "https://attack.mitre.org/techniques/T1082/"
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[rule.threat.tactic]
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id = "TA0007"
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name = "Discovery"
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reference = "https://attack.mitre.org/tactics/TA0007/"
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