Ensure 'Configure Attack Surface Reduction rules: Set the state for each ASR rule' is set to '26190899-1602-49e8-8b27- eb1d0a1ce869:2' or higher

高レベル 1自動defender

説明

This rule prevents Outlook from creating child processes, while still allowing legitimate Outlook functions. Rule ID and name: - 26190899-1602-49e8-8b27-eb1d0a1ce869 (Block Office communication application from creating child processes) The recommended state for this setting is: 26190899-1602-49e8-8b27- eb1d0a1ce869:2 (Audit). Rationale: This ASR rule protects against social engineering attacks and prevents exploiting code from abusing vulnerabilities in Outlook. It also protects against Outlook rules and forms exploits that attackers can use when a user's credentials are compromised. 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:26190899-1602-49e8-8b27-eb1d0a1ce869 (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

$v = (Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Windows Defender Exploit Guard\ASR\Rules' -Name '26190899-1602-49e8-8b27-eb1d0a1ce869' -ErrorAction SilentlyContinue).'26190899-1602-49e8-8b27-eb1d0a1ce869'; if ($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 = 26190899-1602-49e8-8b27-eb1d0a1ce869 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 26190899-1602-49e8-8b27-eb1d0a1ce869 -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 - 1.6.1.12 Ensure 'Configure Attack Surface Reduction rules: Set the state for each ASR rule' is set to '26190899-1602-49e8-8b27- eb1d0a1ce869:2' 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