Default Bitcoin miner found in nandroid backup?

So I was cleaning out the laptop of old files and decided to do a scan. It scanned a folder where I kept most of my phone backups (saved as a just in case) and it picked up a bitcoin miner on my stock MK3 backup. I don't remember which exact rom or if I had any other kernels installed in that backup, but I do recall it being a stock rooted MK3 ROM that was already de-knoxed. Can anyone shed some light to this?

Sorry if this is in the wrong forum.
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