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False positive in Exchange, not in KES

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A file send to us by e-mail was blocked by Kaspersky Security 9.0 for Exchange (

Anti-Virus database issued: 21-8-2018 11:36 (latest)
Anti-Spam database issued: 21-8-2018 11:51 (latest)

The file is blocked because of an Excel file with macro's attached. Check the attached screenshot for details. The exact same file scanned with KES 11 with the latest database is considered clean. Also, when I use your online scanning tool (Virusdesk) it comes back as clean.
Why does Kaspersky for Exchange still consider it malicious, even though they both use the latest databases?

For security reasons, I'd rather not share the file unless absolutely necessary.



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