Adrian Serrano
f656c7bc25
In impact_hosts_file_modified rule, the `note` field contains a Windows
path that causes a confused-face-emoji to be rendered in the
Investigation Guide tab.
Surrounding the path in backticks fixes it.
(cherry picked from commit aa219710a1)
67 lines
2.2 KiB
TOML
67 lines
2.2 KiB
TOML
[metadata]
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creation_date = "2020/07/07"
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maturity = "production"
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updated_date = "2021/10/27"
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[rule]
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author = ["Elastic"]
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description = """
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The hosts file on endpoints is used to control manual IP address to hostname resolutions. The hosts file is the first
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point of lookup for DNS hostname resolution so if adversaries can modify the endpoint hosts file, they can route traffic
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to malicious infrastructure. This rule detects modifications to the hosts file on Microsoft Windows, Linux (Ubuntu or
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RHEL) and macOS systems.
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"""
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from = "now-9m"
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index = ["auditbeat-*", "winlogbeat-*", "logs-endpoint.events.*", "logs-windows.*"]
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language = "eql"
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license = "Elastic License v2"
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name = "Hosts File Modified"
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note = """## Config
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For Windows systems using Auditbeat, this rule requires adding `C:/Windows/System32/drivers/etc` as an additional path in the 'file_integrity' module of auditbeat.yml."""
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references = ["https://www.elastic.co/guide/en/beats/auditbeat/current/auditbeat-reference-yml.html"]
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risk_score = 47
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rule_id = "9c260313-c811-4ec8-ab89-8f6530e0246c"
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severity = "medium"
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tags = ["Elastic", "Host", "Linux", "Windows", "macOS", "Threat Detection", "Impact"]
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timestamp_override = "event.ingested"
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type = "eql"
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query = '''
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any where
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/* file events for creation; file change events are not captured by some of the included sources for linux and so may
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miss this, which is the purpose of the process + command line args logic below */
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(
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event.category == "file" and event.type in ("change", "creation") and
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file.path : ("/private/etc/hosts", "/etc/hosts", "?:\\Windows\\System32\\drivers\\etc\\hosts")
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)
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or
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/* process events for change targeting linux only */
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(
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event.category == "process" and event.type in ("start") and
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process.name in ("nano", "vim", "vi", "emacs", "echo", "sed") and
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process.args : ("/etc/hosts")
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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 = "T1565"
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reference = "https://attack.mitre.org/techniques/T1565/"
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name = "Data Manipulation"
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[[rule.threat.technique.subtechnique]]
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id = "T1565.001"
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reference = "https://attack.mitre.org/techniques/T1565/001/"
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name = "Stored Data Manipulation"
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[rule.threat.tactic]
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id = "TA0040"
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reference = "https://attack.mitre.org/tactics/TA0040/"
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name = "Impact"
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