Hi Ahsan,
I'm Paul and I'm here to help you with your concern.
I think it is malware. I will recommend that you try to use the Microsoft Safety Scanner scan and remove the malware.
https://docs.microsoft.com/en-us/microsoft-365/...
If that didn't help, try to use the Malwarebytes Free virus scan & malware removal tool.
https://www.malwarebytes.com/mwb-download
I hope this helps. Feel free to ask back any questions and keep me posted.
Disclaimer: There are links to non-Microsoft websites.
The pages appear to be providing accurate, safe information.