Query: Sigma YAML for windows / security
Matching passage: Sigma rule: Detects "read access" requests on the services registry key. Adversaries may execute their own malicious payloads by hij. Logsource: windows / security. Rule: title: Service Registry Key Read Access Request id: 11d00fff-5dc3-428c-8184-801f292faec0 status: test description: 'Detects "read access" requests on the services registry key. Adversaries may execute their own malicious payloads by hijacking the Registry entries used by services. Adversaries may use flaws in the permissions for Registry keys related to services to redirect from the originally specified executable to one that they control, in order to launch their own code when a service starts. ' references: - https://center-for-threat-informed-defense.github.io/summiting-the-pyramid/analytics/service_registry_permissions_weakness_check/ - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1574.011/T1574.011.md#atomic-test-1---service-registry-permissions-weakness author: Center for Threat Informed Defense (CTID) Summiting the Pyramid Team date: 2023-09-28 tags: - attack.persistence - attack.privilege-escalation - attack.execution - attack.stealth - attack.t1574.011 logsource: product: windows service: security definition: 'Requirements: SACLs must be enabled for "READ_CONTROL" on the registry keys used in this rule' detection: selection: EventID: 4663 ObjectName|contains|all: - \SYSTEM\ - ControlSet\Services\ AccessList|contains: '%%1538' condition: selection falsepositives: - Likely from legitimate applications reading their key. Requires heavy tuning level: low
Near-miss passage: Sigma rule: Detects attempts to add, modify, or delete Windows Credential Guard related registry keys or values via command line too. Logsource: windows / process_creation. Rule: title: Windows Credential Guard Registry Tampering Via CommandLine id: c17d47b7-dcd6-4109-87eb-d1817bd4cbc9 related: - id: 73921b9c-cafd-4446-b0c6-fdb0ace42bc0 type: similar - id: d645ef86-2396-48a1-a2b6-b629ca3f57ff type: similar status: experimental description: 'Detects attempts to add, modify, or delete Windows Credential Guard related registry keys or values via command line tools such as Reg.exe or PowerShell. Credential Guard uses virtualization-based security to isolate secrets so that only privileged system software can access them. Adversaries may disable Credential Guard to gain access to sensitive credentials stored in the system, such as NTLM hashes and Kerberos tickets, which can be used for lateral movement and privilege escalation. The rule matches suspicious command lines that target DeviceGuard or LSA registry paths and manipulate keys like EnableVirtualizationBasedSecurity, RequirePlatformSecurityFeatures, or LsaCfgFlags. Such activity may indicate an attempt to disable or tamper with Credential Guard, potentially exposing sensitive credentials for misuse. ' references: - https://woshub.com/disable-credential-guard-windows/ - https://learn.microsoft.com/en-us/windows/client-management/mdm/policy-csp-deviceguard author: Swachchhanda Shrawan Poudel (Nextron Systems) date: 2025-12-26 tags: - attack.defense-impairment - attack.t1685 logsource: category: process_creation product: windows detection: selection_img: - Image|endswith: - \powershell.exe - \pwsh.exe - \reg.exe - OriginalFileName: - PowerShell.EXE - pwsh.dll - reg.exe selection_cli: CommandLine|contains: - 'add ' - 'New-ItemProperty ' - 'Set-ItemProperty ' - 'si ' - 'delete ' - 'del ' - 'Remove-ItemProperty ' - 'rp ' selection_key_base: CommandLine|contains: - \Control\DeviceGuard - \Control\LSA - Software\Policies\Microsoft\Windows\DeviceGuard selection_key_specific: CommandLine|contains: - EnableVirtualizationBasedSecurity - RequirePlatformSecurityFeatures - LsaCfgFlags condition: all of selection_* falsepositives: - Unlikely level: high regression_tests_path: regression_data/rules/windows/process_creation/proc_creation_win_credential_guard_registry_tampering/info.yml