Query: detection rule: Identifies when a owner is was removed from a application or service principal in Azure.
Matching passage: Sigma rule: Identifies when a owner is was removed from a application or service principal in Azure.. Logsource: azure / auditlogs. Rule: title: Azure Owner Removed From Application or Service Principal id: 636e30d5-3736-42ea-96b1-e6e2f8429fd6 status: test description: Identifies when a owner is was removed from a application or service principal in Azure. references: - https://learn.microsoft.com/en-us/entra/identity/monitoring-health/reference-audit-activities#core-directory author: Austin Songer @austinsonger date: 2021-09-03 modified: 2026-04-30 tags: - attack.stealth logsource: product: azure service: auditlogs detection: selection: operationName: - Remove owner from service principal - Remove owner from application condition: selection falsepositives: - Owner being removed may be performed by a system administrator. - Verify whether the user identity, user agent, and/or hostname should be making changes in your environment. - Owner removed from unfamiliar users should be investigated. If known behavior is causing false positives, it can be exempted from the rule. level: medium
Near-miss passage: Sigma rule: Detects the creation of a file with an uncommon extension in an Office application startup folder. Logsource: windows / file_event. Rule: title: Uncommon File Created In Office Startup Folder id: a10a2c40-2c4d-49f8-b557-1a946bc55d9d status: test description: Detects the creation of a file with an uncommon extension in an Office application startup folder references: - https://app.any.run/tasks/d6fe6624-6ef8-485d-aa75-3d1bdda2a08c/ - http://addbalance.com/word/startup.htm - https://answers.microsoft.com/en-us/msoffice/forum/all/document-in-word-startup-folder-doesnt-open-when/44ab0932-2917-4150-8cdc-2f2cf39e86f3 - https://en.wikipedia.org/wiki/List_of_Microsoft_Office_filename_extensions author: frack113, Nasreddine Bencherchali (Nextron Systems) date: 2022-06-05 modified: 2023-12-13 tags: - attack.resource-development - attack.t1587.001 logsource: product: windows category: file_event detection: selection_word_paths: - TargetFilename|contains: \Microsoft\Word\STARTUP - TargetFilename|contains|all: - \Office - \Program Files - \STARTUP filter_exclude_word_ext: TargetFilename|endswith: - .docb - .docm - .docx - .dotm - .mdb - .mdw - .pdf - .wll - .wwl selection_excel_paths: - TargetFilename|contains: \Microsoft\Excel\XLSTART - TargetFilename|contains|all: - \Office - \Program Files - \XLSTART filter_exclude_excel_ext: TargetFilename|endswith: - .xll - .xls - .xlsm - .xlsx - .xlt - .xltm - .xlw filter_main_office_click_to_run: Image|contains: :\Program Files\Common Files\Microsoft Shared\ClickToRun\ Image|endswith: \OfficeClickToRun.exe filter_main_office_apps: Image|contains: - :\Program Files\Microsoft Office\ - :\Program Files (x86)\Microsoft Office\ Image|endswith: - \winword.exe - \excel.exe condition: ((selection_word_paths and not filter_exclude_word_ext) or (selection_excel_paths and not filter_exclude_excel_ext)) and not 1 of filter_main_* falsepositives: - False positive might stem from rare extensions used by other Office utilities. level: high