Jonhnathan
b4c84e8a40
* Update Tags * Bump updated date separately to be easy to revert if needed * Update resource_development_ml_linux_anomalous_compiler_activity.toml * Apply changes from the discussion * Update persistence_init_d_file_creation.toml * Update defense_evasion_timestomp_sysmon.toml * Update defense_evasion_application_removed_from_blocklist_in_google_workspace.toml * Update missing Tactic tags * Update unit tests to match new tags * Add missing IG tags * Delete okta_threat_detected_by_okta_threatinsight.toml * Update command_and_control_google_drive_malicious_file_download.toml * Update persistence_rc_script_creation.toml * Mass bump * Update persistence_shell_activity_by_web_server.toml * . --------- Co-authored-by: Mika Ayenson <Mika.ayenson@elastic.co> Co-authored-by: Mika Ayenson <Mikaayenson@users.noreply.github.com>
72 lines
2.4 KiB
TOML
72 lines
2.4 KiB
TOML
[metadata]
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creation_date = "2020/04/29"
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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 = "2023/06/22"
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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 via CommandLine"
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note = """## Setup
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If enabling an EQL rule on a non-elastic-agent index (such as beats) for versions <8.2, events will not define `event.ingested` and default fallback for EQL rules was not added until 8.2, so you will need to add a custom pipeline to populate `event.ingested` to @timestamp for this rule to work.
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"""
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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 = ["Domain: Endpoint", "OS: Linux", "Use Case: Threat Detection", "Tactic: 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 host.os.type == "linux" and 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", "grep")
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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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