Strange decryptedFile.dmg appearing in Disk Utility window.

See screenshot. I have no file on my desktop with this name and I can't find it using Spotlight and the path at the bottom doesn't exist?
Is this a virus?

Thanks Thomas
I just found it strange and a bit scary after hearing about viruses coming in on the back of Flash.
I noticed that it came back yes.
I dug down to the hidden file it's located in, (see screenshot) really messy, but couldn't access as no permission to open folder it's in.
If you think this is OK I'll get on with some work.
Thanks again for your quick response.
John

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This procedure is a diagnostic test. It makes no changes to your data.
Please triple-click anywhere in the line below on this page to select it:
diskutil list | pbcopy
Copy the selected text to the Clipboard by pressing the key combination command-C.
Launch the built-in Terminal application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Terminal in the icon grid.
Paste into the Terminal window by pressing the key combination command-V. I've tested these instructions only with the Safari web browser. If you use another browser, you may have to press the return key after pasting.
Wait for a new line ending in a dollar sign ($) to appear below what you entered.
The output of the command will be automatically copied to the Clipboard. If the command produced no output, the Clipboard will be empty. Paste into a reply to this message.
The Terminal window doesn't show the output. Please don't copy anything from there.
If any personal information appears in the output, anonymize before posting, but don’t remove the context.

Strange decryptedFile.dmg appearing in Disk Utility window.

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