Ross Wolf
fc2f5866a2
* [Rule Tuning] Creation of Hidden Files and Directories
* Remove redundant `A` from the regex
(cherry picked from commit 9b559d0cd9)
66 lines
1.9 KiB
TOML
66 lines
1.9 KiB
TOML
[metadata]
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creation_date = "2020/04/29"
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maturity = "production"
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updated_date = "2021/03/03"
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min_stack_version = "7.12.0"
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[rule]
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author = ["Elastic"]
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description = """
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Users can mark specific files as hidden simply by putting a "." as the first character in the file or folder name.
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Adversaries can use this to their advantage to hide files and folders on the system for persistence and defense evasion.
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This rule looks for hidden files or folders in common writable directories.
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"""
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false_positives = [
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"""
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Certain tools may create hidden temporary files or directories upon installation or as part of their normal
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behavior. These events can be filtered by the process arguments, username, or process name values.
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""",
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]
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from = "now-9m"
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index = ["auditbeat-*", "logs-endpoint.events.*"]
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language = "eql"
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license = "Elastic License v2"
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max_signals = 33
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name = "Creation of Hidden Files and Directories"
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risk_score = 47
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rule_id = "b9666521-4742-49ce-9ddc-b8e84c35acae"
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severity = "medium"
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tags = ["Elastic", "Host", "Linux", "Threat Detection", "Defense Evasion"]
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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 event.type in ("start", "process_started") and
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process.working_directory in ("/tmp", "/var/tmp", "/dev/shm") and
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process.args regex~ """\.[a-z0-9_\-][a-z0-9_\-\.]{1,254}""" and
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not process.name in ("ls", "find")
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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 = "T1564"
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name = "Hide Artifacts"
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reference = "https://attack.mitre.org/techniques/T1564/"
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[[rule.threat.technique.subtechnique]]
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id = "T1564.001"
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name = "Hidden Files and Directories"
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reference = "https://attack.mitre.org/techniques/T1564/001/"
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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.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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