Query: Sigma rule for This detection uses Windows security events to detect suspicious access attempts to the registry key of Azure AD Health
Matching passage: Sigma rule: This detection uses Windows security events to detect suspicious access attempts to the registry key of Azure AD Health. Logsource: windows / security. Rule: title: Azure AD Health Monitoring Agent Registry Keys Access id: ff151c33-45fa-475d-af4f-c2f93571f4fe status: test description: 'This detection uses Windows security events to detect suspicious access attempts to the registry key of Azure AD Health monitoring agent. This detection requires an access control entry (ACE) on the system access control list (SACL) of the following securable object HKLM\SOFTWARE\Microsoft\Microsoft Online\Reporting\MonitoringAgent. ' references: - https://o365blog.com/post/hybridhealthagent/ - https://github.com/OTRF/Set-AuditRule/blob/c3dec5443414231714d850565d364ca73475ade5/rules/registry/aad_connect_health_monitoring_agent.yml author: Roberto Rodriguez (Cyb3rWard0g), OTR (Open Threat Research), MSTIC date: 2021-08-26 modified: 2022-10-09 tags: - attack.discovery - attack.t1012 logsource: product: windows service: security detection: selection: EventID: - 4656 - 4663 ObjectType: Key ObjectName: \REGISTRY\MACHINE\SOFTWARE\Microsoft\Microsoft Online\Reporting\MonitoringAgent filter: ProcessName|contains: - Microsoft.Identity.Health.Adfs.DiagnosticsAgent.exe - Microsoft.Identity.Health.Adfs.InsightsService.exe - Microsoft.Identity.Health.Adfs.MonitoringAgent.Startup.exe - Microsoft.Identity.Health.Adfs.PshSurrogate.exe - Microsoft.Identity.Health.Common.Clients.ResourceMonitor.exe condition: selection and not filter falsepositives: - Unknown level: medium
Near-miss passage: Sigma rule: Detects when the Notepad++ updater (gup.exe) makes DNS queries to domains that are not part of the known legitimate upda. Logsource: windows / dns_query. Rule: title: Notepad++ Updater DNS Query to Uncommon Domains id: 2074e137-1b73-4e2d-88ba-5a3407dbdce0 status: experimental description: 'Detects when the Notepad++ updater (gup.exe) makes DNS queries to domains that are not part of the known legitimate update infrastructure. This could indicate potential exploitation of the updater mechanism or suspicious network activity that warrants further investigation. ' references: - https://notepad-plus-plus.org/news/v889-released/ - https://www.heise.de/en/news/Notepad-updater-installed-malware-11109726.html - https://www.rapid7.com/blog/post/tr-chrysalis-backdoor-dive-into-lotus-blossoms-toolkit/ - https://www.validin.com/blog/exploring_notepad_plus_plus_network_indicators/ - https://securelist.com/notepad-supply-chain-attack/118708/ author: Swachchhanda Shrawan Poudel (Nextron Systems) date: 2026-02-02 modified: 2026-03-16 tags: - attack.collection - attack.credential-access - attack.t1195.002 - attack.initial-access - attack.t1557 logsource: category: dns_query product: windows detection: selection: Image|endswith: \gup.exe filter_main_notepad_legit_domain: QueryName: notepad-plus-plus.org filter_optional_sourceforge_legit_domain: QueryName|endswith: .sourceforge.net filter_optional_github_legit_domain: - QueryName|endswith: .githubusercontent.com - QueryName: github.com filter_optional_google_storage_legit_domain: QueryName|endswith: .googleapis.com filter_optional_uncommon_domains: QueryName|endswith: - .azurewebsites.net - block.opendns.com - gateway.zscalerthree.net condition: selection and not 1 of filter_main_* and not 1 of filter_optional_* falsepositives: - Some legitimate network misconfigurations or proxy issues causing unexpected DNS queries. - Other legitimate query to official domains not listed in the filter, needing tuning. level: medium