How can I find out if I have a firmware virus?

I used a tool called "CDMA Yemen" to root, and on virustotal.com, there were 4 hits for that file being a virus. After rooting, I did a clean Lineage OS install by wiping everything on TWRP. But if there is a firmware virus at the lowest level, I could still be affected. I've heard about some viruses that live even after a clean wipe of the phone's storage. What tools can I use to find firmware viruses on android?

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