Potential Arbitrary File Download Using Office Application

calendar Sep 25, 2026 · attack.stealth attack.t1202  ·
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Detects potential arbitrary file download using a Microsoft Office application

Sigma rule (View on GitHub)

 1title: Potential Arbitrary File Download Using Office Application
 2id: 4ae3e30b-b03f-43aa-87e3-b622f4048eed
 3related:
 4    - id: 0c79148b-118e-472b-bdb7-9b57b444cc19
 5      type: obsolete
 6status: test
 7description: Detects potential arbitrary file download using a Microsoft Office application
 8references:
 9    - https://lolbas-project.github.io/lolbas/OtherMSBinaries/Winword/
10    - https://lolbas-project.github.io/lolbas/OtherMSBinaries/Powerpnt/
11    - https://lolbas-project.github.io/lolbas/OtherMSBinaries/Excel/
12    - https://lolbas-project.github.io/lolbas/Binaries/Msoxmled/
13    - https://medium.com/@reegun/unsanitized-file-validation-leads-to-malicious-payload-download-via-office-binaries-202d02db7191
14author: Nasreddine Bencherchali (Nextron Systems), Beyu Denis, oscd.community
15date: 2022-05-17
16modified: 2026-09-25
17tags:
18    - attack.stealth
19    - attack.t1202
20logsource:
21    category: process_creation
22    product: windows
23detection:
24    selection_img:
25        - Image|endswith:
26              - '\EXCEL.EXE'
27              - '\MSOXMLED.EXE'
28              - '\POWERPNT.EXE'
29              - '\WINWORD.exe'
30        - OriginalFileName:
31              - 'Excel.exe'
32              - 'msoxmled.exe'
33              - 'POWERPNT.EXE'
34              - 'WinWord.exe'
35    selection_http:
36        CommandLine|contains:
37            - 'http://'
38            - 'https://'
39    condition: all of selection_*
40falsepositives:
41    - Unknown
42level: high

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