Query: Sigma YAML for windows / process_creation
Matching passage: Sigma rule: Detects the usage of "reg.exe" to tamper with different Windows Defender registry keys in order to disable some importan. Logsource: windows / process_creation. Rule: title: Suspicious Windows Defender Registry Key Tampering Via Reg.EXE id: 452bce90-6fb0-43cc-97a5-affc283139b3 status: test description: 'Detects the usage of "reg.exe" to tamper with different Windows Defender registry keys in order to disable some important features related to protection and detection ' references: - https://thedfirreport.com/2022/03/21/apt35-automates-initial-access-using-proxyshell/ - https://github.com/swagkarna/Defeat-Defender-V1.2.0/tree/ae4059c4276da6f6303b8f53cdff085ecae88a91 - https://www.elevenforum.com/t/video-guide-how-to-completely-disable-microsoft-defender-antivirus.14608/page-2 - https://tria.ge/241231-j9yatstqbm/behavioral1 author: Florian Roth (Nextron Systems), Swachchhanda Shrawan Poudel, Nasreddine Bencherchali (Nextron Systems) date: 2022-03-22 modified: 2025-06-04 tags: - attack.defense-impairment - attack.t1685 logsource: category: process_creation product: windows detection: selection_root_img: - Image|endswith: \reg.exe - OriginalFileName: reg.exe selection_root_path: CommandLine|contains: - SOFTWARE\Microsoft\Windows Defender\ - SOFTWARE\Policies\Microsoft\Windows Defender Security Center - SOFTWARE\Policies\Microsoft\Windows Defender\ selection_dword_0: CommandLine|contains|all: - ' add ' - d 0 CommandLine|contains: - DisallowExploitProtectionOverride - EnableControlledFolderAccess - MpEnablePus - PUAProtection - SpynetReporting - SubmitSamplesConsent - TamperProtection selection_dword_1: CommandLine|contains|all: - ' add ' - d 1 CommandLine|contains: - DisableAccess - DisableAntiSpyware - DisableAntiSpywareRealtimeProtection - DisableAntiVirus - DisableAntiVirusSignatures - DisableArchiveScanning - DisableBehaviorMonitoring - DisableBlockAtFirstSeen - DisableCloudProtection - DisableConfig - DisableEnhancedNotifications - DisableIntrusionPreventionSystem - DisableIOAVProtection - DisableNetworkProtection - DisableOnAccessProtection - DisablePrivacyMode - DisableRealtimeMonitoring - DisableRoutinelyTakingAction - DisableScanOnRealtimeEnable - DisableScriptScanning - DisableSecurityCenter - Notification_Suppress - SignatureDisableUpdateOnStartupWithoutEngine condition: all of selection_root_* and 1 of selection_dword_* falsepositives: - Rare legitimate use by administrators to test software (should always be investigated) level: high
Near-miss passage: Sigma rule: Detection for when multi factor authentication has been disabled, which might indicate a malicious activity to bypass au. Logsource: azure / auditlogs. Rule: title: Disabled MFA to Bypass Authentication Mechanisms id: 7ea78478-a4f9-42a6-9dcd-f861816122bf status: test description: Detection for when multi factor authentication has been disabled, which might indicate a malicious activity to bypass authentication mechanisms. references: - https://learn.microsoft.com/en-us/azure/active-directory/authentication/howto-mfa-userstates - https://learn.microsoft.com/en-us/entra/identity/monitoring-health/reference-audit-activities#core-directory - https://research.splunk.com/cloud/482dd42a-acfa-486b-a0bb-d6fcda27318e/ - https://analyticsrules.exchange/analyticrules/65c78944-930b-4cae-bd79-c3664ae30ba7/ - https://www.elastic.co/docs/reference/security/prebuilt-rules/rules/integrations/azure/persistence_entra_id_mfa_disabled_for_user author: '@ionsor' date: 2022-02-08 modified: 2026-04-30 tags: - attack.credential-access - attack.persistence - attack.defense-impairment - attack.t1556 logsource: product: azure service: auditlogs detection: selection: operationName: Disable Strong Authentication properties.result: success condition: selection falsepositives: - Authorized modification by administrators level: medium