defense_evasion_disabling_windows_defender_powershell.toml

[metadata]
creation_date = "2021/07/07"
maturity = "production"
updated_date = "2021/07/07"

[rule]
author = ["Elastic"]
description = "Identifies use of the Set-MpPreference PowerShell command to disable or weaken certain Windows Defender settings."
false_positives = ["Planned Windows Defender configuration changes."]
from = "now-9m"
index = ["winlogbeat-*", "logs-endpoint.events.*", "logs-windows.*"]
language = "eql"
license = "Elastic License v2"
name = "Disabling Windows Defender Security Settings via PowerShell"
references = [
    "https://docs.microsoft.com/en-us/powershell/module/defender/set-mppreference?view=windowsserver2019-ps",
]
risk_score = 47
rule_id = "c8cccb06-faf2-4cd5-886e-2c9636cfcb87"
severity = "medium"
tags = ["Elastic", "Host", "Windows", "Threat Detection", "Defense Evasion"]
timestamp_override = "event.ingested"
type = "eql"

query = '''
process where event.type == "start" and
 (process.name : ("powershell.exe", "pwsh.exe") or process.pe.original_file_name == "PowerShell.EXE") and
 process.args : "Set-MpPreference" and process.args : ("-Disable*", "Disabled", "NeverSend", "-Exclusion*")
'''


[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1562"
reference = "https://attack.mitre.org/techniques/T1562/"
name = "Impair Defenses"
[[rule.threat.technique.subtechnique]]
id = "T1562.001"
reference = "https://attack.mitre.org/techniques/T1562/001/"
name = "Disable or Modify Tools"



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