OK, I'll explain it since what is obvious to me (since security is part of my job) is apparently not obvious to others.
When a semi-anonymous crypto-currency starts reaching incredible value, it acts like a magnet for new ne'er-do-wells to buy their way in to botnets so they can use them to extort organization, and to a lesser degree people, because they see it as a way to get rich (relative to their current economic status and country's economy) quick. Think of it like the gold rush in the Yukon and American West. You had lawyers, doctors, farmers, and others who absolutely got nailed with gold fever and suddenly decided to take up mining as a profession so they could "strike it rich".
Same principal applies here. Typically, on my UTM, I'll see the usual smattering of Russia, China, Brazil and occasionally India. These are what we expect to see. Intrusion attempts, brute force attacks, DDoS, and exploit leveraging on the digital side. However, when crypto-currency starts to rise in value, now we see much more activity from places that you don't see regularly like countries in Eastern Europe, Vietnam, Thailand and some of the Arabian countries to name a few examples.This happens every time Bitcoin starts climbing to high values.
In addition to this, you'll also see a rise in spearphishing, phishing, vishing, and other meat side related shenanigans, too, for ransomeware and cryptoware installation for extortion purposes.
If you have a decent firewall, one that tracks IPs and geolocates them as part of a robust IPS and IDS solution, you can track this for yourself. You'll get a whole raft of script kiddies coming out of the woodwork and mass scanning literally every IP on the planet. Then they'll follow it up with mass port probes looking for open ports on such ports as 22, 25, and 3389 (because, yes, there ARE dumbasses who expose RDP to the public).
It's a tick-tock effect that you can count on with a certain regularity.
"No matter where you go, there you are." Buckaroo Banzai
There are two types of computer users: Masochists and Linux users.
If you would like help or further details on a technical discussion we're having, email me at bnhelp (at sign) keepusiel.net .