Ensure 'Configure Attack Surface Reduction rules: Set the state for each ASR rule' is set to '5beb7efe-fd9a-4556-801d- 275e5ffc04cc:2' or higher

高レベル 1自動defender

説明

This rule detects suspicious properties within an obfuscated script. Rule ID and name: - 5beb7efe-fd9a-4556-801d-275e5ffc04cc (Block execution of potentially obfuscated scripts) The recommended state for this setting is: 5beb7efe-fd9a-4556-801d- 275e5ffc04cc:2 (Audit). Configuring this setting to 5beb7efe-fd9a-4556-801d- 275e5ffc04cc:1 (Block) also conforms to the benchmark. Rationale: Attack surface reduction helps prevent actions and apps that are typically used by exploit-seeking malware to infect machines. Script obfuscation is a common technique that both malware authors and legitimate applications use to hide intellectual property or decrease script loading times. 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:5beb7efe-fd9a-4556-801d-275e5ffc04cc (REG_SZ); compliant when it is 2 or 1.

チェック方法

監査方法: Windows レジストリ

registry

$v = (Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Windows Defender Exploit Guard\ASR\Rules' -Name '5beb7efe-fd9a-4556-801d-275e5ffc04cc' -ErrorAction SilentlyContinue).'5beb7efe-fd9a-4556-801d-275e5ffc04cc'; if ($null -eq $v) { 'unset' } elseif (($null -ne $v -and @('2','1') -contains "$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 = 5beb7efe-fd9a-4556-801d-275e5ffc04cc with a value of 2 or 1. Test in audit mode (2) first. Local alternative (writes Defender preferences, not the Group Policy value this audit reads): Add-MpPreference -AttackSurfaceReductionRules_Ids 5beb7efe-fd9a-4556-801d-275e5ffc04cc -AttackSurfaceReductionRules_Actions 2

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 - 1.6.1.8 Ensure 'Configure Attack Surface Reduction rules: Set the state for each ASR rule' is set to '5beb7efe-fd9a-4556-801d- 275e5ffc04cc:2' or higher

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