“MegaUnitfld” will damage your computer.

It's not a virus. It is macOS informing you of the fact you deliberately downloaded and installed something, perhaps long ago.

To learn how to remove it please read About those "<app> will damage your computer" messages - Apple Community. It also includes an explanation for its appearance.

To avoid future occurrences I encourage you to read Effective defenses against malware and other threats - Apple Community.

alexismarie25 Said:

"'MegaUnitfld' will damage your computer.: This phrase keeps popping up in my mac but I cannot find the file to get rid of it."

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Potential Malicious Software is Detected:

Apparently, the macOS is seeing this as suspicious software, and is informing of what my occur if you run it.

1. Go Here: Safely Open Apps on your Mac - Apple Support
2. Scroll to: Alert that the app will damage your computer or the app is damaged
3. Do as it Reads:

alexismarie25 Said:

"'MegaUnitfld' will damage your computer.: This phrase keeps popping up in my mac but I cannot find the file to get rid of it."

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Troubleshooting "MegaUnitfld":

Five Thoughts:

A. Remove All Items in Downloads:

Look in Downloads, and see if anything is shown there. Then, take a screenshot of Downloads. Next, rid of the file...

How to Rid of this File:

1. Click: the Desktop
2. Hold Down: [command + option + L]
3. Drag & Drop: all items to the trash
4. Empty: the Trash
5. Restart: Your Mac
6. Reply back with the screenshot

B. Uninstall Security Software:

Uninstall this Security Software. Use the Uninstaller to do so, getting the Uninstaller directly from my Developer’s site, as getting it else where may result in Malware or Spyware being installed. If you are uncertain which to download, then as the Developer.

D. Scan your Mac for Malware: 

Use MalwareBytes for Mac --- This is software that searches for malware/adware. So, scan with it and then remove what is found. Once removed, uninstall MalwareBytes for Mac. Then restart the Mac.

Downloads:

1. Malwarebytes Anti-Malware for Mac
2. Malwarebytes Uninstaller

D. Try Using a New Administrator User:

See what happens when you create a new Administrator User and login to it and perform the above. If it works, then it is something mid configured in your current user. So, move everything over to this new user, and then delete this user you are currently logged into.

If none of the above work, then...

E. Restore from a Backup:

Do you have a Time Machine Backup of your Mac that you created prior to this? If so, restore form it. If not, then take this as a learning experience, knowing to always create a Time Machine backup of your Mac prior to making any major change to is (i.e. macOS upgrade), so that you can have something to restore your Mac from, should anything go wrong with the upgrade.  Important:Create a backup prior to performing this restoration.

kimloncj, although the macOS dialog "will damage your computer" is identical to the subject of this Discussion, in your case the particular problem is not related to it.

From what little I can read of the crash report in your screenshot, the process or processes invoked by the "ROES" applications do not comply with Apple's codesigning requirements. Only the developer of that product can fix that problem.

Yours is an illustration of the unhelpfulness of that "will damage your computer" dialog. It's not always something malicious that causes it. Sometimes it's just a poorly maintained app, or a defective one.

At your option, copy the entire text of that crash report and paste it in a reply, but I am nearly certain you will need to contact the developer of that "ROES" product and tell them to fix it.

Please read About those "<app> will damage your computer" messages - Apple Community.

Please read About those "<app> will damage your computer" messages - Apple Community.

Please read About those "<app> will damage your computer" messages - Apple Community.

Please read Removing "Search Marquis" / "Search Baron" / etc on your own - Apple Community, and post the three screenshots it describes in a reply to this Discussion.

To the OP and all getting this error: Report this to Apple.

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alexismarie25 Said:

"'MegaUnitfld' will damage your computer.: This phrase keeps popping up in my mac but I cannot find the file to get rid of it."

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See the screenshot provided.

Googling this (MegaUnitfld site:discussions.apple.com), this is the only post found containing this. So, it’s seemingly new. So report it to Apple…

Report this to Apple:

Do your Part: Inform Apple of your feedback of this issue. Include how you’ve troubleshot this, and your results. Apple wont get back to you directly, but the more feedback they receive from its users, the more likely they will know what needs to be fixed, and why bug fixes to include in updates to come. Apple with know nothing of this occurrence, if you don't report it to them.

1. Go Here: Feedback - macOS - Apple
2. Select: "User Interface" for the "Feedback Type"
3. Select: "Software/Firmware Update" for the "Feedback Area"
4. Proceed from there as necessary

Please read About those "<app> will damage your computer" messages - Apple Community.

alexismarie25 Said:

"'MegaUnitfld' will damage your computer.: This phrase keeps popping up in my mac but I cannot find the file to get rid of it."

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Troubleshooting Error Messages:

Please Provide a Screenshot:

Please provide a screenshot of this error message. IMPORTANT: Block out personal info(i.e. names and email addresses) from it by covering it with red rectangles through use of the photos app. Go Here: Take a Screenshot on your Mac - Apple Support.

IMPORTANT: Be certain to block out personal info (i.e. names and time) by covering it with red-colored rectangles and cute, for Security & Privacy Purposes:

Please review my instructions (excerpted below) and try again.

John Galt wrote:

In the end, you will have captured the contents of the following three separate folders:

~/Library/LaunchAgents

/Library/LaunchDaemons

/Library/LaunchAgents

Please be sure to include or otherwise indicate the name of the folder that corresponds to each screenshot, so that you and I can keep track of which ones they are.

...

... When posting your message, please review and confirm the screenshots you post reveal complete, readable file names. If they do not, then please review the above instructions.

Determining if your Mac is actually in "Safe Mode" may not be readily apparent. I provided this expanded version for Silicon Macs a while ago:

Refer to Use safe mode on your Mac - Apple Support.

1. Start with a Mac powered on in the usual manner, logged into your User Account.
2. Shut down the Mac using  > Shut Down...
3. Wait until the Mac actually shuts down. You can confirm it has actually shut down by pressing the Caps Lock key. The Mac will begin to start, but the Caps Lock LED will not illuminate until after the Apple logo appears. If that did not happen then it was not shut down, so you might as well start over at Step 1.
4. Press and hold the power button / Touch ID button. "Continue holding for startup options..." will appear, followed a second or two later by "Loading startup options...". If that does not happen, you might as well start over from the beginning.
5. When the "hard disk" and "gear" icons appear, release the power button.
6. Select (momentarily click) the startup disk. "Continue" will appear beneath it.
7. Press and hold either Shift key. The "Continue" button legend should change to "Continue in Safe Mode".
8. Continue holding the Shift key and click that button. You can release the Shift key when the indeterminate progress indicator "spinner" appears.
9. The usual Login screen will appear, but "Safe Boot" should appear in red at the upper right of the Mac's menu bar.
10. Log in in the usual manner. Once logged in, it might not be obvious the Mac is in Safe Mode. You can confirm that it is by holding a Control key when clicking  > System Information... > Software. Under System Software Overview, the words Boot Mode: Safe should appear. Get system information for your Mac - Apple Support describes how to open the System Information app.

Twice as many steps as Apple describes, but it should be abundantly clear about what you're doing and what you should expect.

I need those screenshots everett233.

Please review my instructions (excerpted below) and try again.

John Galt wrote:

In the end, you will have captured the contents of the following three separate folders:

~/Library/LaunchAgents

/Library/LaunchDaemons

/Library/LaunchAgents

Please be sure to include or otherwise indicate the name of the folder that corresponds to each screenshot, so that you and I can keep track of which ones they are.

...

... When posting your message, please review and confirm the screenshots you post reveal complete, readable file names. If they do not, then please review the above instructions.

Following instructions is the key to success.