TMA-DEFENDER-1.5.2

Ensure 'Configure the 'Block at First Sight' feature' is set to 'Enabled'

高レベル 1自動defender

説明

This policy setting configures whether the device checks (in real time) with the Microsoft Active Protection Service (MAPS) before allowing certain content to be run or accessed. The block at first sight feature works when Microsoft Defender Antivirus encounters a suspicious but undetected file. Rationale: Enabling the Block at First Sight feature enhances threat protection by using next-generation protection to detect new malware and block it within seconds. 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\Spynet:DisableBlockAtFirstSeen (REG_DWORD); compliant when it is 0. Remediation writes 0 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

registry

$v = (Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Spynet' -Name 'DisableBlockAtFirstSeen' -ErrorAction SilentlyContinue).'DisableBlockAtFirstSeen'; if ($null -eq $v) { 'unset' } elseif (($null -ne $v -and @(0) -contains [int64]$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

shell

$p = 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Spynet'; if (-not (Test-Path -Path $p)) { New-Item -Path $p -Force | Out-Null }; New-ItemProperty -Path $p -Name 'DisableBlockAtFirstSeen' -Value 0 -PropertyType DWord -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 - 1.5.2 Ensure 'Configure the 'Block at First Sight' feature' is set to 'Enabled'

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。

shell

tmaegis scan --target defender