Query: Sigma rule for Detects changes to the Windows EventLog channel permission values. It focuses on changes to the Security Descriptor Defi
Matching passage: Sigma rule: Detects changes to the Windows EventLog channel permission values. It focuses on changes to the Security Descriptor Defi. Logsource: windows / registry_set. Rule: title: Windows Event Log Access Tampering Via Registry id: ba226dcf-d390-4642-b9af-b534872f1156 status: experimental description: 'Detects changes to the Windows EventLog channel permission values. It focuses on changes to the Security Descriptor Definition Language (SDDL) string, as modifications to these values can restrict access to specific users or groups, potentially aiding in defense evasion by controlling who can view or modify a event log channel. Upon execution, the user shouldn''t be able to access the event log channel via the event viewer or via utilities such as "Get-EventLog" or "wevtutil". ' references: - https://www.atomicredteam.io/atomic-red-team/atomics/T1562.002#atomic-test-8---modify-event-log-channel-access-permissions-via-registry---powershell - https://www.youtube.com/watch?v=uSYvHUVU8xY - https://learn.microsoft.com/en-us/windows/win32/secauthz/security-descriptor-definition-language author: X__Junior date: 2025-01-16 modified: 2025-08-16 tags: - attack.privilege-escalation - attack.persistence - attack.defense-impairment - attack.t1547.001 - attack.t1112 logsource: category: registry_set product: windows detection: selection_key_1: TargetObject|contains: \SYSTEM\CurrentControlSet\Services\EventLog\ TargetObject|endswith: \CustomSD selection_key_2: TargetObject|contains: - \Policies\Microsoft\Windows\EventLog\ - \Microsoft\Windows\CurrentVersion\WINEVT\Channels TargetObject|endswith: \ChannelAccess selection_details: - Details|contains: D:(D; - Details|contains|all: - D:( - )(D; filter_main_trustedinstaller: Image: C:\Windows\servicing\TrustedInstaller.exe filter_main_tiworker: Image|startswith: C:\Windows\WinSxS\ Image|endswith: \TiWorker.exe filter_optional_empty: Image: '' filter_optional_null: Image: null condition: 1 of selection_key_* and selection_details and not 1 of filter_main_* and not 1 of filter_optional_* falsepositives: - Administrative activity, still unlikely level: high
Near-miss passage: Sigma rule: Detects powershell scripts that adds a Name Resolution Policy Table (NRPT) rule for the specified namespace. This will b. Logsource: windows / ps_script. Rule: title: Powershell Add Name Resolution Policy Table Rule id: 4368354e-1797-463c-bc39-a309effbe8d7 status: test description: 'Detects powershell scripts that adds a Name Resolution Policy Table (NRPT) rule for the specified namespace. This will bypass the default DNS server and uses a specified server for answering the query. ' references: - https://twitter.com/NathanMcNulty/status/1569497348841287681 - https://learn.microsoft.com/en-us/powershell/module/dnsclient/add-dnsclientnrptrule?view=windowsserver2022-ps author: Borna Talebi date: 2021-09-14 modified: 2022-10-09 tags: - attack.impact - attack.t1565 logsource: product: windows category: ps_script definition: 'Requirements: Script Block Logging must be enabled' detection: selection: ScriptBlockText|contains|all: - Add-DnsClientNrptRule - -Namesp - -NameSe condition: selection falsepositives: - Unknown level: high