Hi mrinmayb,

I’m not sure how to take this.

The detection is correct as we stopped the powershell from running. We haven’t removed the executable of the powershell.

The detection means that there is file-less malware which is using powershell and we report the process not the file itself.

I suggest you to use autoruns https://docs.microsoft.com/en-us/sysinternals/downloads/autoruns to see if there is some information about the powershell and/or msiexec.

If you can share the output of the autoruns with me I can help you with the finding of the virus if we haven’t remove it completely.
You can share the download link with me via a PM.

Regards,
PDI