defense_evasion_hidden_file_dir_tmp.toml

[metadata]
creation_date = "2020/04/29"
maturity = "production"
updated_date = "2021/03/03"
min_stack_comments = "EQL regex syntax introduced in 7.12"
min_stack_version = "7.12.0"

[rule]
author = ["Elastic"]
description = """
Users can mark specific files as hidden simply by putting a "." as the first character in the file or folder name.
Adversaries can use this to their advantage to hide files and folders on the system for persistence and defense evasion.
This rule looks for hidden files or folders in common writable directories.
"""
false_positives = [
    """
    Certain tools may create hidden temporary files or directories upon installation or as part of their normal
    behavior. These events can be filtered by the process arguments, username, or process name values.
    """,
]
from = "now-9m"
index = ["auditbeat-*", "logs-endpoint.events.*"]
language = "eql"
license = "Elastic License v2"
max_signals = 33
name = "Creation of Hidden Files and Directories"
risk_score = 47
rule_id = "b9666521-4742-49ce-9ddc-b8e84c35acae"
severity = "medium"
tags = ["Elastic", "Host", "Linux", "Threat Detection", "Defense Evasion"]
timestamp_override = "event.ingested"
type = "eql"

query = '''
process where event.type in ("start", "process_started") and
  process.working_directory in ("/tmp", "/var/tmp", "/dev/shm") and
  process.args regex~ """\.[a-z0-9_\-][a-z0-9_\-\.]{1,254}""" and
  not process.name in ("ls", "find")
'''


[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1564"
name = "Hide Artifacts"
reference = "https://attack.mitre.org/techniques/T1564/"
[[rule.threat.technique.subtechnique]]
id = "T1564.001"
name = "Hidden Files and Directories"
reference = "https://attack.mitre.org/techniques/T1564/001/"



[rule.threat.tactic]
id = "TA0005"
name = "Defense Evasion"
reference = "https://attack.mitre.org/tactics/TA0005/"
[[rule.threat]]
framework = "MITRE ATT&CK"

[rule.threat.tactic]
id = "TA0003"
name = "Persistence"
reference = "https://attack.mitre.org/tactics/TA0003/"