Hi C.D.O,
I'm Dyari. Thanks for reaching out. I will be happy to assist you in this regard.
Click on Start > Settings > System > Battery > Scroll down to "Battery usage per app" to see which app is draining the battery.
If you’re interested in getting more technical info about your battery usage and estimated capacity, you can use the Powerfg command-line option that’s built into Windows 10 to generate a battery report.
1-Select Search on the taskbar, type Command prompt, press and hold (or right-click) Command prompt, and then select Run as administrator > Yes.
2-At the command prompt, type powercfg /batteryreport, then press Enter.
3-The battery report will be an HTML file that’s stored in a folder on your PC. The file location will be shown in the Command Prompt window.
4-Open File Explorer, go to the folder that the report was saved to, and then double-click the battery report (HTML file) to open it in your web browser.
5-You can get a lot of detailed info about your battery usage and capacity. Some particular sections you might want to look at to get started including the following: Installed battery, Recent usage, and Battery usage.
Regarding the malware, uninstall any third-party security software and scan for viruses & malware with the free Malwarebytes:
https://www.malwarebytes.com/mwb-download
You can also follow the instructions below to fix battery drain in Windows 10:
https://support.microsoft.com/en-us/windows/tip...
https://thegeekpage.com/how-to-fix-battery-drai...
Please do not hesitate to ask if you need further assistance.
Stay safe
____________________________________________________________
Standard Disclaimer: There are links to non-Microsoft websites. The pages appear to be providing accurate, safe information. Watch out for ads on the sites that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the sites before you decide to download and install it.