Query: Sigma rule for Detects suspicious Windows Defender Application Control (WDAC) policy file creation from abnormal processes that could b
Matching passage: Sigma rule: Detects suspicious Windows Defender Application Control (WDAC) policy file creation from abnormal processes that could b. Logsource: windows / file_event. Rule: title: Potentially Suspicious WDAC Policy File Creation id: 1d2de8a6-4803-4fde-b85b-f58f3aa7a705 status: experimental description: 'Detects suspicious Windows Defender Application Control (WDAC) policy file creation from abnormal processes that could be abused by attacker to block EDR/AV components while allowing their own malicious code to run on the system. ' references: - https://learn.microsoft.com/en-us/windows/security/application-security/application-control/app-control-for-business/deployment/deploy-appcontrol-policies-using-group-policy - https://beierle.win/2024-12-20-Weaponizing-WDAC-Killing-the-Dreams-of-EDR/ - https://learn.microsoft.com/en-us/windows/security/application-security/application-control/app-control-for-business/deployment/appcontrol-deployment-guide - https://learn.microsoft.com/en-us/windows/security/application-security/application-control/app-control-for-business/deployment/deploy-appcontrol-policies-with-script - https://learn.microsoft.com/en-us/windows/security/application-security/application-control/app-control-for-business/deployment/deploy-appcontrol-policies-with-memcm author: X__Junior date: 2025-02-07 modified: 2026-05-18 tags: - attack.defense-impairment logsource: category: file_event product: windows detection: selection_target: TargetFilename|contains: \Windows\System32\CodeIntegrity\ filter_main_images: Image|endswith: - \Microsoft.ConfigurationManagement.exe - \WDAC Wizard.exe - C:\Program Files\PowerShell\7-preview\pwsh.exe - C:\Program Files\PowerShell\7\pwsh.exe - C:\Windows\System32\dllhost.exe - C:\Windows\System32\WindowsPowerShell\v1.0\powershell_ise.exe - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe - C:\Windows\SysWOW64\dllhost.exe - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell_ise.exe - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe filter_main_cli: - CommandLine|contains|all: - ConvertFrom-CIPolicy -XmlFilePath - '-BinaryFilePath ' - CommandLine|contains: CiTool --update-policy - CommandLine|contains|all: - Copy-Item -Path - -Destination filter_main_system: Image: System filter_main_wuauclt: Image: C:\Windows\System32\wuauclt.exe filter_main_wuaucltcore: Image: - C:\Windows\UUS\arm64\wuaucltcore.exe - C:\Windows\UUS\Packages\Preview\arm64\wuaucltcore.exe condition: selection_target and not 1 of filter_main_* falsepositives: - Administrators and security vendors could leverage WDAC, apply additional filters as needed. level: medium
Near-miss passage: Sigma rule: Detects changes and updates to the user risk and MFA registration policy. Attackers can modified the policies to Bypass. Logsource: azure / auditlogs. Rule: title: User Risk and MFA Registration Policy Updated id: d4c7758e-9417-4f2e-9109-6125d66dabef status: test description: 'Detects changes and updates to the user risk and MFA registration policy. Attackers can modified the policies to Bypass MFA, weaken security thresholds, facilitate further attacks, maintain persistence. ' references: - https://learn.microsoft.com/en-us/entra/id-protection/howto-identity-protection-configure-mfa-policy - https://learn.microsoft.com/en-us/entra/identity/monitoring-health/reference-audit-activities author: Harjot Singh (@cyb3rjy0t) date: 2024-08-13 tags: - attack.persistence logsource: product: azure service: auditlogs detection: selection: LoggedByService: AAD Management UX Category: Policy OperationName: Update User Risk and MFA Registration Policy condition: selection falsepositives: - Known updates by administrators. level: high