Uncommon File Created In Office Startup Folder
Detects the creation of a file with an uncommon extension in an Office application startup folder
Detection logic
Detection requirements
- Platform
- PRE
The rule states no platform. This is derived from the ATT&CK technique it maps to.
- Log source product
- windows
- Log source category
- file_event
Known benign triggers
- False positive might stem from rare extensions used by other Office utilities.
MITRE ATT&CK mappings
0 exclusive techniques.This is coverage no other published rule has; it is not this rule's total technique count.
References
| Reference | Cited by |
|---|---|
| addbalance.com/word/startup.htm | Only this detection cites it |
| answers.microsoft.com/en-us/msoffice/forum/all/document-in-word-startup-folder-doesnt-open-when/44ab0932-2917-4150-8cdc-2f2cf39e86f3 | Only this detection cites it |
| app.any.run/tasks/d6fe6624-6ef8-485d-aa75-3d1bdda2a08c/ | Only this detection cites it |
| en.wikipedia.org/wiki/List_of_Microsoft_Office_filename_extensions | Only this detection cites it |
From the source
- At source
- Open at source
- Upstream identifier
- a10a2c40-2c4d-49f8-b557-1a946bc55d9d
- Tagged by the source as
- attack.resource-development
Licence
- Published under
- Detection Rule License 1.1Read the licence
- Attribution
- Required
Authorship
- Published
- Aug 26, 2026
- Version
- 1