What is Stopping Cryptocurrency from Being Broken by a Large Botnet?

I will admit that my understanding of cryptocurrency is limited, but it seems to be vulnerable to a botnet attack, wherein malware silently infects devices that validates/stores transactions, and manipulates their ledgers simultaneously. Is my theory bunk, or is it a real threat? If you could manipulate enough ledgers at enough nodes, wouldn't this be feasible? Do we think something like this might be underway?

submitted by /u/Derangedteddy
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from hacking: security in practice https://ift.tt/3ByDxRH

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