Ruben Groenewoud
a1716bd673
* [Rule Tuning] Several rule tunings * Added 1 more * optimized ransomware encryption rules * Update rules/linux/impact_potential_linux_ransomware_file_encryption.toml * Update rules/linux/impact_potential_linux_ransomware_note_detected.toml * Added 2 more tunings based on todays telemetry * Some tunings * Tuning * Tuning * fixed user.id comparison * Something went wrong with deprecation * Something went wrong with deprecation * Update rules/linux/impact_potential_linux_ransomware_file_encryption.toml * Update rules/linux/discovery_linux_nping_activity.toml Co-authored-by: Jonhnathan <26856693+w0rk3r@users.noreply.github.com> * Update rules/linux/discovery_linux_hping_activity.toml Co-authored-by: Jonhnathan <26856693+w0rk3r@users.noreply.github.com> * Dedeprecated the rule to deprecate later --------- Co-authored-by: Jonhnathan <26856693+w0rk3r@users.noreply.github.com>
77 lines
2.4 KiB
TOML
77 lines
2.4 KiB
TOML
[metadata]
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creation_date = "2020/04/24"
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integration = ["endpoint"]
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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 = "2023/08/24"
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[rule]
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author = ["Elastic"]
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description = """
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Kernel modules are pieces of code that can be loaded and unloaded into the kernel upon demand. They extend the
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functionality of the kernel without the need to reboot the system. This rule identifies attempts to remove a kernel
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module.
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"""
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false_positives = [
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"""
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There is usually no reason to remove modules, but some buggy modules require it. These can be exempted by username.
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Note that some Linux distributions are not built to support the removal of modules at all.
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""",
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]
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from = "now-9m"
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index = ["logs-endpoint.events.*", "endgame-*"]
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language = "eql"
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license = "Elastic License v2"
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name = "Kernel Module Removal"
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references = ["http://man7.org/linux/man-pages/man8/modprobe.8.html"]
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risk_score = 47
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rule_id = "cd66a5af-e34b-4bb0-8931-57d0a043f2ef"
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severity = "medium"
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tags = ["Domain: Endpoint", "OS: Linux", "Use Case: Threat Detection", "Tactic: Defense Evasion", "Data Source: Elastic Endgame"]
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timestamp_override = "event.ingested"
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type = "eql"
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query = '''
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process where host.os.type == "linux" and event.action == "exec" and process.name == "rmmod" or
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(process.name == "modprobe" and process.args in ("--remove", "-r")) and
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process.parent.name in ("sudo", "bash", "dash", "ash", "sh", "tcsh", "csh", "zsh", "ksh", "fish")
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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 = "T1562"
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name = "Impair Defenses"
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reference = "https://attack.mitre.org/techniques/T1562/"
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[[rule.threat.technique.subtechnique]]
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id = "T1562.001"
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name = "Disable or Modify Tools"
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reference = "https://attack.mitre.org/techniques/T1562/001/"
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[rule.threat.tactic]
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id = "TA0005"
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name = "Defense Evasion"
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reference = "https://attack.mitre.org/tactics/TA0005/"
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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 = "T1547"
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name = "Boot or Logon Autostart Execution"
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reference = "https://attack.mitre.org/techniques/T1547/"
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[[rule.threat.technique.subtechnique]]
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id = "T1547.006"
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name = "Kernel Modules and Extensions"
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reference = "https://attack.mitre.org/techniques/T1547/006/"
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[rule.threat.tactic]
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id = "TA0003"
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name = "Persistence"
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reference = "https://attack.mitre.org/tactics/TA0003/"
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