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Excel file with NO macro


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Weird behavior of Malwarebytes for windows. When I try to open an xlsx file I got an exploit. Only if the file is resident in my local copy of Onedrive. The same file opened from another position, works fine. The file is a trivial tabel, I created, not a internet download!

Exported report is:


-Log Details-
Protection Event Date: 4/24/21
Protection Event Time: 9:05 AM
Log File: 677c37be-a4cb-11eb-92f2-8cec4bcbc164.json

-Software Information-
Components Version: 1.0.1251
Update Package Version: 1.0.39749
License: Premium

-System Information-
OS: Windows 10 (Build 19042.928)
CPU: x64
File System: NTFS
User: System

-Exploit Details-
File: 0
(No malicious items detected)

Exploit: 1
Malware.Exploit.Agent - Exploit payload macro process blocked, , Blocked, 0, 392684, 0.0.0, ,

-Exploit Data-
Affected Application: Microsoft Office Excel
Protection Layer: Application Behavior Protection
Protection Technique: Exploit payload macro process blocked
File Name:




Any hint?



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