Python: Files In Use By Another Process

Published: 2022-07-17
Last Updated: 2022-07-17 17:20:54 UTC
by Didier Stevens (Version: 1)
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It's something you encounter regularly on Windows: you can't access a file because it is in use by another process.

I wanted to look at a malware sample with my zipdump.py tool, and got this result:

Maybe that sample is locked by an AV program or so, I thought, so I used Process Explorer to find open handles to this sample file.

And I found no open handles ...

Then it dawned on me: "The process cannot access the file because it is being used by another process." ...

That is not a message I coded in my zipdump.py tool ...

So it's not the sample file that can't be opened, it's zipdump.py!

I searched again with Process Explorer, this time for open handles to zipdump, and indeed: the file was open in a comparison program. I closed it, and then I could run the command.

 

Didier Stevens
Senior handler
Microsoft MVP
blog.DidierStevens.com

Keywords: file locked
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