Ensure 'Configure Attack Surface Reduction rules: Set the state for each ASR rule' is set to '92e97fa1-2edf-4476-bdd6- 9dd0b4dddc7b:1'

高レベル 1自動defender

説明

This rule prevents VBA macros from calling Win32 APIs. Office VBA enables Win32 API calls. Rule ID and name: - 92e97fa1-2edf-4476-bdd6-9dd0b4dddc7b (Block Win32 API calls from Office macros) The recommended state for this setting is: 92e97fa1-2edf-4476-bdd6- 9dd0b4dddc7b:1 (Block). Rationale: Attack surface reduction helps prevent actions and apps that are typically used by exploit-seeking malware to infect machines. Malware can abuse VBA macro calls with various methods, such as calling Win32 APIs to launch malicious shellcode without writing anything directly to disk. 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\Windows Defender Exploit Guard\ASR\Rules:92e97fa1-2edf-4476-bdd6-9dd0b4dddc7b (REG_SZ); compliant when it is 1.

チェック方法

監査方法: Windows レジストリ

registry

$v = (Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Windows Defender Exploit Guard\ASR\Rules' -Name '92e97fa1-2edf-4476-bdd6-9dd0b4dddc7b' -ErrorAction SilentlyContinue).'92e97fa1-2edf-4476-bdd6-9dd0b4dddc7b'; if ($null -eq $v) { 'unset' } elseif (($null -ne $v -and @('1') -contains "$v")) { 'compliant' } else { "non-compliant: $v" }

期待される出力: compliant

修正方法

修正方法: ガイダンスまたは IaC パッチ

Configure through Group Policy: Computer Configuration\Policies\Administrative Templates\Windows Components\Microsoft Defender Antivirus\Microsoft Defender Exploit Guard\Attack Surface Reduction\Configure Attack Surface Reduction rules: Set the state for each ASR rule = 92e97fa1-2edf-4476-bdd6-9dd0b4dddc7b with a value of 1. Test in audit mode (2) first. Local alternative (writes Defender preferences, not the Group Policy value this audit reads): Add-MpPreference -AttackSurfaceReductionRules_Ids 92e97fa1-2edf-4476-bdd6-9dd0b4dddc7b -AttackSurfaceReductionRules_Actions 1

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 - 1.6.1.16 Ensure 'Configure Attack Surface Reduction rules: Set the state for each ASR rule' is set to '92e97fa1-2edf-4476-bdd6- 9dd0b4dddc7b:1'

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