Zero days may get the headlines, but attackers are finding a lot of value in leveraging old vulnerabilities. CISA, FBI and NSA have issued several advisories over the last month highlighting an overarching theme of advanced persistent threat groups targeting unpatched vulnerabilities lately.
I observed something similar that began earlier this year. I wrote about it on the Tenable blog. They impersonate many of the people following Trump and engaging with his tweets, irrespective of party affiliation.