Ruben Groenewoud
71186c8788
* [Rule Tuning] changed rule type to new_terms * Updated min stack comment * Update persistence_rc_script_creation.toml * Changed description, removed file.path from new_terms field because it is not necessary * added host.id to new terms field and bumped up min stack
67 lines
2.4 KiB
TOML
67 lines
2.4 KiB
TOML
[metadata]
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creation_date = "2023/02/28"
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integration = ["endpoint"]
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maturity = "production"
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min_stack_comments = "Multiple field support in the New Terms rule type was added in Elastic 8.6"
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min_stack_version = "8.6.0"
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updated_date = "2023/06/22"
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[rule]
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author = ["Elastic"]
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description = """
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This rule monitors the creation/alteration of the rc.local file by a previously unknown process executable
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through the use of the new terms rule type. The /etc/rc.local file is used to start custom applications,
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services, scripts or commands during start-up. The rc.local file has mostly been replaced by Systemd.
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However, through the "systemd-rc-local-generator", rc.local files can be converted to services that run at
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boot. Adversaries may alter rc.local to execute malicious code at start-up, and gain persistence onto the
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system.
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"""
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from = "now-9m"
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index = ["logs-endpoint.events.*", "auditbeat-*", "endgame-*"]
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language = "kuery"
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license = "Elastic License v2"
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name = "Potential Persistence Through Run Control Detected"
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references = [
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"https://www.intezer.com/blog/malware-analysis/hiddenwasp-malware-targeting-linux-systems/",
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"https://pberba.github.io/security/2022/02/06/linux-threat-hunting-for-persistence-initialization-scripts-and-shell-configuration/#8-boot-or-logon-initialization-scripts-rc-scripts",
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"https://www.cyberciti.biz/faq/how-to-enable-rc-local-shell-script-on-systemd-while-booting-linux-system/"
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]
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risk_score = 47
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rule_id = "0f4d35e4-925e-4959-ab24-911be207ee6f"
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severity = "medium"
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tags = ["Elastic", "Host", "Linux", "Threat Detection", "Persistence", "Elastic Endgame"]
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type = "new_terms"
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query = '''
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host.os.type : "linux" and event.category : "file" and
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event.type : ("change" or "file_modify_event" or "creation" or "file_create_event") and
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file.path : "/etc/rc.local" and not file.extension : "swp"
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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 = "T1037"
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name = "Boot or Logon Initialization Scripts"
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reference = "https://attack.mitre.org/techniques/T1037/"
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[[rule.threat.technique.subtechnique]]
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id = "T1037.004"
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name = "RC Scripts"
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reference = "https://attack.mitre.org/techniques/T1037/004/"
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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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[rule.new_terms]
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field = "new_terms_fields"
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value = ["host.id", "process.executable"]
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[[rule.new_terms.history_window_start]]
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field = "history_window_start"
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value = "now-7d"
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