“Spearheaded by REvil, one of the most notorious cybercrime syndicates in the world, and supported by Killnet, its close successor, their threats should not be taken lightly.”
Believe it.
From February 2021 (Bloomberg):
Fed Outage Raises Questions on Wall Street as Services Restored
For about four hours Wednesday, Federal Reserve systems that execute millions of financial transactions a day -- everything from payroll to tax refunds to interbank transfers -- were disrupted by what appeared to be some sort of internal glitch.