Query: Sigma YAML for windows / file_event
Matching 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
Near-miss passage: Sigma rule: Detect the creation of a service with a service binary located in a suspicious directory. Logsource: windows / registry_set. Rule: title: Service Binary in Suspicious Folder id: a07f0359-4c90-4dc4-a681-8ffea40b4f47 related: - id: c0abc838-36b0-47c9-b3b3-a90c39455382 type: obsolete status: test description: Detect the creation of a service with a service binary located in a suspicious directory references: - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1562.001/T1562.001.md author: Florian Roth (Nextron Systems), frack113 date: 2022-05-02 modified: 2025-10-07 tags: - attack.persistence - attack.defense-impairment - attack.t1112 logsource: category: registry_set product: windows detection: selection_service_start: TargetObject|startswith: HKLM\System\CurrentControlSet\Services\ TargetObject|endswith: \Start Image|contains: - \Users\Public\ - \Perflogs\ - \ADMIN$\ - \Temp\ Details: - DWORD (0x00000000) - DWORD (0x00000001) - DWORD (0x00000002) selection_service_imagepath: TargetObject|startswith: HKLM\System\CurrentControlSet\Services\ TargetObject|endswith: \ImagePath Details|contains: - \Users\Public\ - \Perflogs\ - \ADMIN$\ - \Temp\ filter_optional_avast: Image|contains|all: - \Common Files\ - \Temp\ filter_optional_mbamservice: TargetObject|endswith: \CurrentControlSet\Services\MBAMInstallerService\ImagePath Details|endswith: \AppData\Local\Temp\MBAMInstallerService.exe" Image: C:\Windows\system32\services.exe condition: 1 of selection_* and not 1 of filter_optional_* falsepositives: - Unknown level: high