defense_evasion_file_permission_modification.toml

[metadata]
creation_date = "2023/07/12"
integration = ["endpoint"]
maturity = "production"
min_stack_comments = "New fields added: required_fields, related_integrations, setup"
min_stack_version = "8.3.0"
updated_date = "2023/07/12"

[rule]
author = ["Elastic"]
description = """
Identifies the change of permissions/ownership of files/folders through built-in Windows utilities. Threat actors may
require permission modification of files/folders to change, modify or delete them.
"""
from = "now-119m"
interval = "60m"
index = ["logs-endpoint.events.*"]
language = "eql"
license = "Elastic License v2"
name = "File and Directory Permissions Modification"
risk_score = 21
rule_id = "bc9e4f5a-e263-4213-a2ac-1edf9b417ada"
severity = "low"
tags = ["Domain: Endpoint", "OS: Windows", "Use Case: Threat Detection", "Tactic: Defense Evasion", "Rule Type: BBR", "Data Source: Elastic Defend"]
timestamp_override = "event.ingested"
building_block_type = "default"
type = "eql"

query = '''
process where event.type == "start" and host.os.type == "windows" and
(
  ((process.name: "icacls.exe" or process.pe.original_file_name == "iCACLS.EXE") and process.args: ("*:F", "/reset", "/setowner", "*grant*")) or
  ((process.name: "cacls.exe" or process.pe.original_file_name == "CACLS.EXE") and process.args: ("/g", "*:f")) or
  ((process.name: "takeown.exe" or process.pe.original_file_name == "takeown.exe") and process.args: ("/F")) or
  ((process.name: "attrib.exe" or process.pe.original_file_name== "ATTRIB.EXE") and process.args: "-r")
) and not user.id : "S-1-5-18"
'''


[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1222"
name = "File and Directory Permissions Modification"
reference = "https://attack.mitre.org/techniques/T1222/"

[[rule.threat.technique.subtechnique]]
id = "T1222.001"
name = "Windows File and Directory Permissions Modification"
reference = "https://attack.mitre.org/techniques/T1222/001/"


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