Microsoft Defender Antivirus
TMA-DEFENDER-1.15.2
Ensure 'Specify threat alert levels at which default action should not be taken when detected' is set to 'Enabled: Medium: 2 or 3'
説明
This policy setting configures which automatic remediation action Microsoft Defender Antivirus will take for each threat alert level detection. Valid threat alert levels are: - 1 = Low - 2 = Medium - 4 = High - 5 = Severe Valid remediation action values are: - 2 = Quarantine - 3 = Remove - 6 = Ignore Threat alert levels are added under "options" for this setting. Each entry must be listed as a name value pair. Rationale: By default, Defender uses the action embedded in each threat’s malware signature (clean, quarantine, remove, etc.). Configuring this setting ensures the same action is always taken, regardless of how Microsoft classifies a specific threat. Audit reads the Group Policy registry value and prints 'compliant', 'unset' (policy not configured, reported as FAIL) or the non-compliant value. Registry value: HKLM\SOFTWARE\Policies\Microsoft\Windows Defender\Threats\ThreatSeverityDefaultAction:2 (REG_SZ); compliant when it is 2 or 3. Remediation writes 2 locally; in a domain set it through the ADMX so Group Policy does not revert it.
チェック方法
監査方法: Windows レジストリ
$v = (Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Threats\ThreatSeverityDefaultAction' -Name '2' -ErrorAction SilentlyContinue).'2'; if ($null -eq $v) { 'unset' } elseif (($null -ne $v -and @('2','3') -contains "$v")) { 'compliant' } else { "non-compliant: $v" }- 期待される出力
compliant
修正方法
修正方法: シェルコマンド
$p = 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Threats\ThreatSeverityDefaultAction'; if (-not (Test-Path -Path $p)) { New-Item -Path $p -Force | Out-Null }; New-ItemProperty -Path $p -Name '2' -Value '2' -PropertyType String -Force | Out-Nullプロパティ
- オペレーティングシステム
- すべて
- タグ
- defenderantiviruscis-l1
- 参照
- CIS Microsoft Defender Antivirus Benchmark v1.0.0 - 1.15.2 Ensure 'Specify threat alert levels at which default action should not be taken when detected' is set to 'Enabled: Medium: 2 or 3'
このホストをチェック
監査が許可されているマシンで実行してください。スキャンは読み取り専用です。
tmaegis scan --target defender